Monessen Hearth ODWR400 Mounting instructions
948
SR cover
11/18/97
For use in U.S./Canada
Underwriter's Laboratories Report No. MH6018
87D1502 3/09 Rev. 1
Homeowner's Installation
and Operating Manual
2
ODWR Series Outdoor Woodburning Fireplaces
87D1502
Description ................................................3
Precautions ................................................3
Moisture Resistance .........................................3
Drafts ....................................................3
Gas Logs .................................................3
Cleaning .................................................3
........................................4
Hearth Dimensions ..........................................5
Chase Installation and Parts Identification . . . . . . . . . . . . . . . . . . . . . . . 5
Chimney Requirements ......................................7
..............................................8
Moisture Resistance .........................................8
Mounting the Fireplace .......................................8
Planning the Chimney Run ....................................8
The Ten Foot Rule ..........................................8
Chimney Supports ..........................................9
Chase Installation ...........................................9
......................................................9
Insulating Fireplace Enclosure for Cold Climates . . . . . . . . . . . . . . . . . . . 9
Framing .................................................10
Chimney Setup ............................................10
Straight-Up Chimney Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Offset Installation ..........................................10
Ceiling Chimney Hole/Possible Obstructions . . . . . . . . . . . . . . . . . . . . . 10
Cutting the Hole ...........................................11
Framing the Ceiling Hole ....................................11
Positioning, Safety Strips, Securing the Fireplace . . . . . . . . . . . . . . . . . 11
Installing Outside Air Kit .....................................12
Installing the Chimney System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Finishing .................................................14
Side Wall Protection ........................................16
Hearth Installation ..........................................16
Installing Line for Gas Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
..............................................19
...................................................20
...........................................21
.......................................................23
Read all instructions and warnings carefully before starting installation. Failure to follow these instruc-
tions may result in a possible fire hazard and will void the warranty.
Fuels used in gas, wood-
burning or oil fired appliances, and the products of
combustion of such fuels, contain chemicals known to
the State of California to cause cancer, birth defects
and other reproductive harm.
California Health & Safety Code Sec. 25249.6
3
ODWR Series Outdoor Woodburning Fireplaces
87D1502
The ODWR fireplaces are clean-faced, solid fuel, wood-
burning fireplaces.
Monessen Fireplaces and component parts have been
highly tested and will operate safely when installed in
accordance with instructions provided in this manual.
Carefully read and understand all instructions
beginning installation.
If you notice any damage to fireplace or component parts,
immediately report damage to your Monessen Fireplaces
dealer.
Only use MHSC components or the warranty will be
voided and a fire hazard may be created.
MHSC warranty will be voided by and MHSC disclaims
any responsibility for the following actions:
•
•
•
•
Consult local building codes to ensure that you are in
compliance installing the fireplace.
Fireplaces must be vented to the out-of-doors.
This outdoor fireplace will shed moderate amounts of
water, but is not waterproof. Water and condensing water
vapor may enter the chase under certain conditions.
The fireplace will not perform as an exterior wall. Mois-
ture penetration must be considered for construction
that places the fireplace in structure walls or on moisture
sensitive surfaces.
When installed on exterior walls: MHSC recommends
the fireplace chase be constructed outside the structure's
weather envelope. Where the platform meets the wall,
use a flashing detail similar to that required for attached
decks. Chase platforms, including hearths should slope
away from the structure at 1/4 in per foot. The fireplace
can be shimmed level.
When installed on surfaces where water may collect or
cause damage: MHSC recommends a slope of 1/8 in
to 1/4 in per foot towards the drain port suggested. The
fireplace can be shimmed level.
Hearths should slope away from the front of the fireplace
and chase at 1/8 in to 1/4 in per foot. Metal safety strips
must be on top of any combustible hearth materials used
for moisture management.
The fireplace should not be located in areas that create
drafts (ie: frequently opened doors and central heating air
inlets/outlets) that hamper the normal flow of air into the
fire.
If you plan to install a gas log, the gas line should be
installed before framing the fireplace. The gas line must
be installed by a certified gas line installer.
There are three methods of cleaning the polished stain-
less steel of your outdoor fireplace;
1. Warm, soapy water - to loosen any dirt film
2. Glass cleaner with ammonia
3. Stainless steel cleaner available at hardware stores
Regardless of which method is used, remember that any-
thing with too much abrasive may dull the finish.
4
ODWR Series Outdoor Woodburning Fireplaces
87D1502
ODWR500 specifications and framing.
42"
(1067 mm)
46"
(1168 mm)
396"
(1006 mm)
5/8"
(16 mm)
5/8" (16 mm)
1/2" (13 mm)
1/2"
226M"
(578 mm)
24"
(610 mm)
76M"
(197 mm)
756O"
(191 mm)
Gas Line
Access
Recessed
Nailing
Flange
FP591
SR42 SPECS
10/28/98
7/6/99 djt
correct dims.
11" Dia.
(279 mm)
Minimum Rough Opening
Width 47" (1194 mm)
Minimum
Rough
Opening
Height
Minimum
Rough
Opening
Depth
50" (1270 mm)
50" (1270 mm)
7056O" (1791 mm)
856M"
(210 mm)
22"
(559 mm)
2256O"
(572 mm)
2656M"
(667 mm)
436M"
(1111 mm)
146"
(372 mm)
11"
(279 mm)
8"
(203 mm)
756O"
(191 mm)
Outside
Air
Gas Line
Access
8" Dia.
(203 mm)
36" (914 mm)
ODWR400 specifications and framing.
36"
(914 mm)
146"
(372 mm)
11"
(279 mm)
40"
(1016 mm)
396"
(1006 mm)
5/8"
(16 mm)
5/8" (16 mm)
4856O" (1232 mm)
4856O" (1232 mm)
1/2" (13 mm)
1/2"
6856O" (1740 mm)
856M"
(210 mm)
22"
(559 mm)
2256O"
(572 mm)
22" (559 mm)
226M"
(578 mm)
24"
(610 mm)
436M"
(1111 mm)
8"
(203 mm)
76M"
(197 mm)
756O"
(191 mm)
756O"
(191 mm)
Outside
Air
Gas Line
Access
Gas Line
Access
Recessed
Nailing
Flange
6811
ODSR36
specs
9/03
11" Dia.
(279 mm)
Minimum Rough Opening
Width 41" (1041 mm)
Minimum
Rough
Opening
Height
Minimum
Rough
Opening
Depth
8" Dia.
(203 mm)
3456O" (876 mm)
5
ODWR Series Outdoor Woodburning Fireplaces
87D1502
A
B
C
FP1531
hearth dimensions
9/04 djt
ODWR400 31¹⁄₈" 19⁷⁄₈" 15¹⁄₂"
(791 mm) (505 mm) (394 mm)
ODWR500 36³⁄₄" 22⁷⁄₈" 15¹⁄₂"
(934 mm) (581 mm) 394 mm)
FP1531
Hearth dimensions.
1/2” (13 mm)
FP1642
concrete install
9/06
Blocking
Metal Safety Strips
Hard, Flat Surface
(i.e. concrete)
Exterior chase installation.
When installation
is on a hard, flat surface
(such as concrete), the
surface must be sloped
1/4" per foot away from
any structure.
FP1642
FP554
BR/BC
Combo of IWF261 AND IWF265
11/10/97
Insulation methods shown are optional for cold climate, not a
requirement for unit operation or exterior installation .
FP554
Fireplace and chase parts identification.
Termination Cap
Storm Collar
Pan Flashing
Batt Insulation
(cut out around
firestop)
Firestop
Ceiling Level
Draftstop
Ledge Bracket
Surround
Damper Control
Gas Line
Knockout
(both sides)
Screen
Grate
Firebox
Metal Safety
Strips (1,2 or 3)
Outside Air
Cover Plate
Gas Line Access
(both sides)
FP1641a
exterior chase installation
9/06
Termination Cap
Storm Collar
Pan Flashing
Ledge
Bracket
Surround
Damper
Control
Gas Line
Knockout
(both
sides)
Screen
Grate
Firebox
Metal Safety
Strips (1,2 or 3)
Outside Air
Cover Plate
Gas Line Access
(both sides)
Interior sides
of chase
should be
weather proof
Exterior
Siding
Exterior
Siding
Standoff
FP1641a
6
ODWR Series Outdoor Woodburning Fireplaces
87D1502
FP1001
fireplace setting
1/4/00 djt
10'
(3m)
Min.
6'4"
(1.9m)
Min.
If the fireplace is a
freestanding unit, it must be
located a minimum of 10'
(3 m) from the opening of
the firebox to a combustible
structure.
A minimum height of 6'4"
(1.9 m) measured from the
base of the firebox to the
bottom of the termination
cap is permitted.
FP1001
Freestanding installation.
7
ODWR Series Outdoor Woodburning Fireplaces
87D1502
0 0 0 0 0 3" 11"
1 0 0 0 0 8¹⁄₄" 20"
0 1 0 0 0 11¹⁄₄" 25¹⁄₄"
2 0 0 0 0 13¹⁄₂" 29¹⁄₄"
1 1 0 0 0 16¹⁄₂" 34¹⁄₄"
0 0 1 0 0 20¹⁄₄" 40³⁄₄"
2 1 0 0 0 21³⁄₄" 43¹⁄₂"
0 0 0 1 0 26¹⁄₄" 51¹⁄₄"
0 1 1 0 0 28¹⁄₂" 55¹⁄₄"
1 0 0 1 0 31¹⁄₂" 60¹⁄₄”
0 1 0 1 0 34¹⁄₂" 65¹⁄₂"
0 0 2 0 0 37¹⁄₂" 70³⁄₄"
1 1 0 1 1 41¹⁄₂" 77³⁄₄"
0 0 1 1 1 45" 83³⁄₄"
0 1 2 0 1 47¹⁄₄" 87¹⁄₂"
0 0 0 2 1 51" 94"
0 1 1 1 1 53¹⁄₄" 98"
0 0 3 0 1 56¹⁄₄" 103¹⁄₄"
0 1 0 2 1 59¹⁄₄" 108¹⁄₂"
0 0 2 1 1 62¹⁄₄" 113¹⁄₂"
0 1 3 0 1 64¹⁄₂" 117¹⁄₂"
0 0 1 2 1 68¹⁄₄" 124"
0 1 2 1 1 70¹⁄₂" 128"
0 0 0 3 1 74¹⁄₄" 134¹⁄₂"
0 1 1 2 2 78" 140³⁄₄"
0 0 3 1 2 81" 146"
0 1 0 3 2 84" 151¹⁄₄"
0 0 2 2 2 87" 156¹⁄₂"
0 1 3 1 2 89¹⁄₄" 160¹⁄₄"
0 0 1 3 2 93" 166³⁄₄"
0 1 2 2 2 95¹⁄₄" 170³⁄₄"
0 0 0 4 2 99¹⁄₄" 177³⁄₄"
0 1 1 3 2 101¹⁄₄" 181³⁄₄"
0 0 3 2 2 104¹⁄₄" 186¹⁄₄"
0 1 0 4 2 107¹⁄₄" 191¹⁄₂"
0 0 2 3 2 110¹⁄₄" 196³⁄₄"
0 1 3 2 3 114" 203¹⁄₄"
0 0 1 4 3 117³⁄₄" 209³⁄₄"
0 1 2 3 3 120" 213¹⁄₂"
0 0 0 5 3 123³⁄₄" 220"
¹⁄₂
G + H cannot exceed 20 feet.
Air Space Clearances: SK8 (2-wall) = 1¹⁄₂" and "S" Series (3-wall) = 2"
The following safety rules apply to offset
installations (letters correspond with il-
lustration above):
Height of the chimney is measured
from the hearth to the chimney exit.
ODWR400 ODWR500
Maximum: 90'0" 90'0"
Minimum:
Without Elbows 12' 6" 12' 6"
With 2 Elbows* 14' 6" 14' 6"
With 4 Elbows* 21' 0" 21' 0"
Do not use more than 4 elbows per
chimney.
Attach the straps of the return (top) elbow
to a structural framing member.
The offset (first) elbow of any pair does
not have straps.
IWF269
The chimney cannot be more than 30°
(45° in Canada) from the vertical plane in
any installation*.
The maximum length of the angled run
of the chimney system is 20 feet. (G
plus H cannot exceed 20 feet.)
A chimney support (Model SKCS8)
is required every 6 feet of angled run of
chimney. Chimney supports are required
for every 30 feet and 60 feet (SK8 pipe)
or 20 feet and 40 feet (3-wall pipe) of ver-
tical chimney height above the hearth.
Determine the offset distance of your
chimney arrangement from the centerline
of the fireplace to the centerline of the
chimney where it is to pass through the
first ceiling.
This offset distance may not be
your full offset distance. See Examples 2
and 3.
FP282
MBUF
5/26/96
OFFSET
RISE
FP282
* In Canada, two (2) SK845 are allowed.
Chimney system requirements.
D
RISE
BG
H
B
OFFSET
C
E
6 FT.
G
H
A
HEARTH
FLOOR
CHIMNEY
SECTION
CHIMNEY FLUE EXIT
ELBOW
FP269
MBUF
5/16/96
rev. 5/25
30˚
OFFSET
ELBOW
30˚
OFFSET
ELBOW
30˚
RETURN
ELBOW
30˚
RETURN
ELBOW
SKCS8
SUPPORT
Example 1 Example 2 Example 3
8
ODWR Series Outdoor Woodburning Fireplaces
87D1502
Preplanning an installation is very important to ensure
safety and to save time and money. An installer must
predetermine where a fireplace will be set and how the
chimney system will be run.
This outdoor fireplace will shed moderate amounts of
water, but is not waterproof. Water and condensing wa-
ter vapor may enter the chase under certain conditions.
The fireplace will not perform as an exterior wall. Mois-
ture penetration must be considered for construction
that places the fireplace in structure walls or on mois-
ture sensitive surfaces.
When installed on exterior walls: MHSC recommends
the fireplace chase be constructed outside the struc-
ture's weather envelope. Where the platform meets
the wall, use a flashing detail similar to that required
for attached decks. Chase platforms, including hearths
should slope away from the structure at 1/4 in per foot.
The fireplace can be shimmed level.
When installed on surfaces where water may collect or
cause damage: MHSC recommends a slope of 1/8 in
to 1/4 in per foot towards the drain port suggested. The
fireplace can be shimmed level.
Hearths should slope away from the front of the fire-
place and chase at 1/8 in to 1/4 in per foot. Metal safety
strips must be on top of any combustible hearth materi-
als used for moisture management.
A fireplace may only be mounted on the following sur-
faces:
1. A flat combustible surface.
2. A raised wooden platform.
3. A concrete block or other solid object placed beneath
each of the four (4) corners of the fireplace.
The fireplace be spaced 1/2" (13 mm) from a
combustible back wall and 1/2" (13 mm) from a com-
bustible side wall or support. (Page 21, Fig. 21)
Determine how the chimney will be run, length of run
and chimney components required to complete the
job. (Fig. 6) install a chimney below minimum
heights.
In planning a chimney system, it is important to know:
1. The height of a chimney is measured from the
hearth to the exit point on the termination.
2. A chimney cannot be offset more than 30° from a
vertical plane.
3. A chimney may run straight up or it may be neces-
sary to offset it to avoid obstructions.
4. The maximum length of an angled run (total chimney
system) is 20' (6 m).
5. No more than 2 offsets (4 total 30° elbows in U.S./or
2 total 45° elbows in Canada) per fireplace may be
used.
6. A guy wire stabilizer is required for chimneys extend-
ing more than 6' (1.8 m) above a roof line.
Major U.S. building codes specify a minimum chimney
height above the roof top. The “Ten Foot Rule” is a fire
safety rule and not a draft rule. To ensure proper draft,
it is recommended that you always meet or exceed the
“Ten Foot Rule,” especially when installing a termination
on a high pitch roof. (Fig. 9)
The key points of the "Ten Foot Rule" are:
1. If the horizontal distance from the chimney to the
peak of the roof is 10' (3 m) or less, the top of the
chimney must be at least 2' (610 mm) above the
peak of the roof, but never less than 3' (914 mm)
in height above the highest point where it passes
through the roof.
2. If a horizontal distance from the chimney to the peak
of the roof is more than 10' (3 m), a chimney height
reference point is established on the surface of the
roof a distance of 10' (3 m) from the chimney in a
horizontal plane. The top of the chimney must be
at least 2' (610 mm) above the reference point, but
never less than 3' (614 mm) in height above the high-
est point where it passes through the roof.
L1
L1
LTMODEL SK
2 WALL CHIMNEY
TOTAL
LENGTH
(LT)
INSTALLED
LENGTH
(L1)
SK81
SK818
SK83
SK84
1156O"
1756O"
3556O"
4756O"
1056O"
1656O"
3456O"
4656O"
FP288
MBUF-INSTALLED LENGTH
6/17/96
Installed lengths of chimney sections.
WF288
9
ODWR Series Outdoor Woodburning Fireplaces
87D1502
AC246
Ten Foot Rule illustration.
2’ Min.
2’ Min.
3’
Min.
0 To 10’
3’
Min.
0 To 10’
AC246
4/1/96
Reference
Point
The chimney system is supported by the fireplace for
vertical chimney heights less than 30' (9 m) above the
hearth. Chimney supports are required if the vertical
height exceeds 30' (9 m) with SK8 chimneys or 20' (6 m)
with 3-wall chimneys. Locate
chimney supports at ceil-
ing holes or other structural framing at 30' (9 m) (SK8)
or 20' (6 m) (3-wall) heights. Spacing between chimney
supports exceed 30' (9 m) (SK8) or 20' (6 m)
(3-wall). Use Chimney Support Model SKCS8.
Support provided by elbow straps fulfills the
support requirement only if they are spaced as previ-
ously described. (A chimney support is 2¹⁄₂" (64 mm)
long when installed.)
Angled chimney runs require a support every 6' (1.8 m)
in addition to the elbow straps. Chimney supports are
used for this function. (Fig. 10)
A chase is a vertical boxlike structure which encloses
the fireplace and/or chimney. Chases are typically built
on the outside of the house with fireplace opening cut
into the outer wall of a room. (Page 5, Fig. 5)
If you need help in determining fireplace location or how
the chimney system should be run, contact your Mones-
sen dealer for assistance.
FP284
Chimney support installation
FP284
MBUF
5/25/96
Chimney Sup-
port Strap
SKCS8
If you live in a cold climate, it is not required but
that you insulate fireplace
enclosure to eliminate cold air penetration as much
as possible.
Insulate base of fireplace with a noncombustible
insulation rated for a minimum of 300°F. Insulating
is for outside wall installations over
a concrete slab. If fireplace is installed on a platform,
insulation should be placed on top of the platform
fireplace is set. (Fig. 11)
When a fireplace is installed in a chase or on an
outside wall, enclosure should be treated like any
outside wall in a home. Insulation should be installed
on the inside wall as well as the outside wall(s). In a
chase, it is also a good idea to install a firestop at the
first ceiling level above the fireplace and enclose the
chase with sheeting material. Insulation may then be
installed above sheeting material to assure the space
around the fireplace is totally protected. (Fig. 5)
When installing the chimney, caulk between
outer pipe and firestop. It is vital that some air be al-
lowed to flow through this very thin gap.
(Page
21, Fig. 21)
FP555
Insulating between platform and fireplace.
FP555
BR
11/10/97
Hard Flat
Surface
Insulation
Platform
10
ODWR Series Outdoor Woodburning Fireplaces
87D1502
Framing can be constructed before or after the fireplace
is set in place, however, most installers build the frame
before setting the fireplace.
Frame fireplace with 2 x 4 lumber or heavier materials.
Refer to framing dimensions in Figures 1, 2, 3 or 4 for
basic fireplace specifications.
Framing should be positioned to accommodate
wall covering and fireplace facing material.
Since you have already preplanned the chimney run,
you should know exactly how the installation is to be
accomplished — how much pipe is required, the num-
ber of elbows, if any, and type of termination to be used.
REPORT TO YOUR DEALERS ANY
PARTS DAMAGED IN SHIPMENT, SPECIFICALLY
CHECK THE END CONNECTION OF CHIMNEY SEC-
TIONS AND ELBOWS.
Fireplaces may use MHSC model SK8, or Mod-
el S (three wall) chimney systems. The ODWR Series
"A" Fireplace will accept the SK8 chimney system as is;
but a TWABR adapter collar is required when using the
Model S (triple wall) chimney system. The installation
procedure described in this manual applies to the
SK8 system. Either chimney system may be used, but
be mixed.
To mark the centerline of the flue, put the fireplace in final
position and measure out from the wall: 9¹⁄₄" (235 mm).
Mark a spot on the ceiling directly above the fireplace.
Draw a line parallel to the back wall through this mark.
(Fig. 12)
Using a plumb bob positioned directly over center point
of fireplace flue collar, mark the ceiling to establish the
chimney center point. (Fig. 12)
In order to clear an obstruction, it may be necessary to
offset chimney from vertical. This is accomplished by
using MHSC elbows. Use the 30° Offset Elbow table on
Page 5 to determine proper offset and parts required.
Each offset requires two (2) elbows. The second elbow
is equipped with support straps. It is very important to
install the second elbow in each offset as close to the
ceiling or support as possible so that the elbow straps
can be secured to framing members to help support the
weight of the chimney.
FP556
Locate centerline of chimney with plumb line.
FP556
BR/BC
LOCATE CENTER LINE
11/10/97
9¹⁄₄"
(235mm)
Chimney Centerline
Actual Centerpoint
Plumb Line
Plumb Bob
Imaginary
Centerpoint
Determine offset distance of your chimney arrangement
from centerline of fireplace to centerline of chimney
where it is to pass through ceiling.
Locate center point of the chimney on ceiling as though
a straight up chimney arrangement is to be used. Mea-
sure your offset dimension from straight up chimney
center point on ceiling.
The size of the hole in ceiling will vary with the angle at
which the chimney passes through ceiling.
Drive a nail up through ceiling at marked chimney cen-
ter point. Go to floor above and see where hole will be
cut. Check to see where existing ceiling joists and other
possible obstructions are located...i.e. wiring, plumbing
etc... If necessary, reposition chimney and/or fireplace
to avoid obstructions.
11
ODWR Series Outdoor Woodburning Fireplaces
87D1502
Cover fireplace collar opening and cut proper sized
chimney hole in chimney. The SK8 pipe allows you to
run pipe through a typical 16” on center joist without
cutting joists.
Frame the ceiling chimney hole as shown in Figure
14. It is good practice to use framing lumber that is the
same size as the ceiling joists; this is a requirement at
attic level.
The following table gives firestop spacer model num-
bers:
Typical frame for ceiling chimney hole.
FP551
FP551
BR/BC
9/29/97
AB AB
A"SK" Series framing = 14¹⁄₂" X 14¹⁄₂" (368 x 368mm)
B"S" Series framing = 17¹⁄₂" X 17 ¹⁄₂" (445 x 445mm)
Existing
Ceiling Joist
Ceiling
New
Framing Members
Chimney Hole
Ceiling chimney hole sizes necessary for installing
firestop spacer.
8" Flue SKFS2A SKFS6A
"SK" Series 14¹⁄₂" x 14¹⁄₂" 14¹⁄₂" x 25¹⁄₂"
(368mm x 368mm) (368mm x 648mm)
8" Flue FS2A FS6A
"S" Series 3-Wall 17¹⁄₂" x 17¹⁄₂" 17⁷⁄₈" x 29⁵⁄₈"
(445mm x 445mm) (454mm x 753mm)
The of the frame the same
as the hole size selected from Figure 13 in order to
provide required the 1¹⁄₂" (38 mm) of air space between
the outside diameter of the chimney and the edges of
the framed ceiling hole.
Slide fireplace into position.
Lift the fireplace front slightly and slide the metal safety
strips under front bottom edge about 1¹⁄₂" (38 mm), al-
lowing the remainder to extend in front of firebox. Over-
FP557
BR
11/10/97
1¹⁄₂"
FP557
Safety strip installation.
1/2" Min.
Overlap
Metal Safety
Strips
(1, 2 or 3 pieces)
"Z" Safety
Strip
(not sup-
plied)
Fire-
place
Plat-
form Hearth Ext.
lap strips at least 1/2" (13 mm) to provide a positive
joint. (Flat safety strips are packed with fireplace.) (Fig. 15)
Safety strips are used to ensure that any combustible
materials in front of the fireplace are protected even
though a noncombustible hearth extension is required.
If fireplace is to be elevated above the floor, a “Z”
shaped metal safety strip must be fabricated and used
to protect combustible surfaces in front of the fireplace.
This “Z” shaped safety strip is not provided but must be
fabricated of metal with each horizontal leg at least 1¹⁄₂"
(38 mm) wide and equal in length to the metals strips
provided with the fireplace.
Safety strips are not required over noncombus-
tible floors where all supports at the base of the fire-
place are noncombustible.
Four (4) nailing flanges are incorporated on each corner
of the surround. Bend the nailing flanges out, level the
box, then secure it firmly in place by nailing the flanges
to the framing members as shown in Figure 16.
FP549
Fasten fireplace in position.
FP549
9/29/97
BR/BC
Nail Top
Standoffs
Nail Side-
Nailing
Flanges
12
ODWR Series Outdoor Woodburning Fireplaces
87D1502
FP270/271
CR Series
2/19/99 djt
Attach straps to a structural framing member.
FP270/271
Support Structure
Elbow Strap
(must be tight)
Ceiling Hole
Framing
Angle Firestop
Chimney Support Strap
(must be tight)
An outside air kit is not installed in all ODWR Fireplac-
es. If desired, or if local codes mandate the use of an
air kit, then an AKU1 is required . If the outside air kit is
to be used, the AKU1 be installed the
fireplace is enclosed. Refer to the AKU1 instructions for
field installation.
Start by attaching the first chimney section to the collar
on top of the fireplace.
Install the pipe as pictured in Figure 17. When you
get a good lock, you will hear the pipe clearly snap
together. Once sections are snap-locked in place, it is
extremely difficult to get them apart.
UP
FP558
BR
11/10/97
FP558
Install pipe, listening for the snap-lock to fasten.
Pipe Section
Pipe
Rim
Hem
Pipe
Rim
Lance
When installing elbows, only outer pipe will snap-
lock. Middle pipes simply slide into position. Be sure
to always attach straps on upper elbow to a structural
framing member. (Fig. 18)
Continue installing the pipe as required until pipe is
installed up through the ceiling. At this point, you must
install a firestop spacer.
A firestop spacer is used to keep pipe spaced properly
and required for safety.
Nail the firestop spacer (at each corner) to the framing
members of the ceiling hole. A firestop spacer
is not required at the roof.
Hole sizes listed in Figure 13 for angled firestop spac-
ers provide minimum required air space to chimney
pipe for ceiling thickness up to 8" (203 mm). When
combined thickness of ceiling material, ceiling joists and
flooring material exceeds 8" (203 mm), adjustments
must be made in framing to assure that minimum air
spaces to chimney are maintained.
Figure 19 shows different installation procedures for
both an area that is an attic and an area that is not an
attic.
If the area above the ceilingan attic, position the
firestop spacer with the flange on the ceiling side and
the angled portion extending up into the hole.
If the area above the ceiling an attic, position the
firestop spacer with the flange on the top of the framed
hole and the angled portion extending down into the
hole.
Firestop spacers are not available for nor are they
required on vertical walls.
put any sealant around the area where the
outer pipe slides through the firestop spacer. If you
seal this area,
In Canada, an attic insulation shield is required to pre-
vent attic insulation from contacting the chimney sec-
tion. Framing dimensions for the chimney hole should
measure 14¹⁄₂" x 14¹⁄₂" (368 x 368 mm). An attic shield
MUST be installed on top of attic joists (above the floor
level). (Fig. 20)
13
ODWR Series Outdoor Woodburning Fireplaces
87D1502
FP593
SR/C
11/20/97
Installing firestop spacer.
FP593
Nails (4)
Firestop
Spacer
Joist
Joist
Firestop Spacer
Nails (4)
Install the attic insulation shield with the flanges on its
base extending down into the framing hole. Nail each
corner of attic insulation shield to the framing members
of the ceiling hole using 8d nails. Attic shields are not
required at the roof.
FP263
Attic shield installlation (Canadian requirement).
FP263
MBUF
5/9/96
Attic
Insulation
Shield
Nails
(4 required)
Attic
Joist
Ceiling
Base
Flanges
Continue attaching pipe sections to complete system
to next level always being careful that the pipe is firmly
snapped locked in place before proceeding to next pipe
section.
If chimney supports are required, they are installed the
same as elbows. Nail chimney support straps to adja-
cent structural framing, as shown on, Page 9, Figure
10. Bend straps as necessary and make sure they are
secure so they will support the weight of the chimney. A
chimney support is 2¹⁄₂" (64 mm) long when installed.
Consider this dimension when determining how many
straight chimney sections are needed.
Chimney supports are generally used in long
runs in a chase installation.
If you encounter additional ceilings, repeat same steps
required for first ceiling installation. Refer to firestop
illustration on Figure 19.
Run pipe to roofline. Since chimney system must be
vented to the out-of-doors, you use an approved
MHSC termination.
If a chase is used, refer to the installation manual pro-
vided with the termination cap.
Use same procedure detailed in locating centerpoint of
the flue system.
Drive a nail up through roof at the center point. This will
determine center point on outside of the roof.
Size of roof hole varies with the type of chimney
termination installed. Refer to installation instructions
provided with MHSC chimney termination to find correct
size of roof hole.
There must be a 1¹⁄₂ (38 mm) air space between out-
ermost portion of chimney sections and any adjacent
combustible surfaces. (Combustible surfaces include
burnable materials such as: ceiling members, joists,
flooring, combustible insulation and roof structures.)
Mark an outline of the roof hole around the center of the
point nail. Hole dimensions given in the chimney
top installation instructions are dimensions;
therefore, the hole size must be marked on the roof
accordingly.
Cover the opening of the installed chimney so debris
cannot get into the system.
14
ODWR Series Outdoor Woodburning Fireplaces
87D1502
Cut and frame the hole. It is good practice to use fram-
ing lumber that is the same size as the rafters. Install
the frame securely because the chimney top and flash-
ing anchored to the frame must be able to withstand
heavy winds.
Since you have already preplanned the height of your
termination according to the Ten Foot Rule, continue to
install pipe to the predetermined height.
Check the chimney top installation instructions for
details on how high above the roof top the chimney
sections (all pipes) should extend.
Follow the installation instructions provided with the
chimney termination you have selected.
Refer to Page 5, Figure 5 for an illustration of a typical
chase installation.
Treatment of firestop spacers and con-
struction of chase may vary with type of building.
These instructions are not a substitute for local building
codes. You check your local building codes to
determine specific requirements for your city or state.
Other building materials may be required in
addition to MHSC Firestop Spacers.
All joints between the finished wall and
the fireplace surround (top/sides) must be sealed with
non-combustible material to prevent cold air leakage
into the room. Only noncombustible material may be
applied to the facing of the fireplace surround. (Black
painted area) (Fig. 21)
Finish the wall with material of your choice.
If a combus-
tible material is used below a flat mantel shelf, consult
your local building codes for minimum clearance from
top of fireplace opening to bottom of mantel shelf.
All joints (top, bottom and sides) where wall or deco-
rative facing material meets fireplace surround must
be completely sealed with a noncombustible material.
(Figs. 22 and 23)
FP559
Minimum clearances to combustibles.
Front View Side View
Standoff
Combustible framing material MUST NOT
penetrate AIR SPACE (shaded areas).
Air Space Clearances
Only noncombustible
material may be applied
as facing to the black
fireplace surround.
Wall
Shield
Hearth
Extension
0" Clearance
to Floor
Firestop
¹⁄₂" Air
Space
to Back
¹⁄₂" Air
Space
to Sides
FP559
BR/BC-AIR SPACES
11/10/97
1¹⁄₂"
¹⁄₂" air space
to sides
No side wall protection is required for fireplaces
installed at 45° to two (2) side walls (corner installation).
Often a decorative surround or vertical portion of the
mantel is desired. If this is constructed of any combus-
tible material it must be within the safe zone indicated in
Figure 24.
15
ODWR Series Outdoor Woodburning Fireplaces
87D1502
12"
(305mm)
Max.
FP531a
BR/BC
mantel clearances
9/03 djt
¹⁄₂"
12"
(305mm)
Max.
12"
(305mm)
Min.
1¹⁄₂"
(38mm)
*
12"
(305mm)
Min.
1¹⁄₂"
(38mm)
6"
(159mm)
Min.
Combustible Mantel
and Trim
Combustible Mantel
and Trim
Finished Wall
Header
Standoff
Noncombustible
Material
Radiant
Surround
Face
Fireplace Opening
* Minimum width from top of surround
to bottom of screen rail
Finished Wall
Header
Standoff
Noncombustible
Material
Radiant
Surround
Face
Noncombustible
Facing Material
Radiant Surround Face
2 x 4 Stud
Finished Wall
Must be sealed with
Noncombustible Material FP531a
Mantel clearances.
MA81
Combustible mantel clearances.
MA81
rev. 8/5/97
156O"
Ref.
Combustible materials are
permitted within a shaded area
shown in Figure 24 titled
Minimum Wall Clearances.
*
**
Face Plate
16
ODWR Series Outdoor Woodburning Fireplaces
87D1502
Minimum Wall Clearances
WITH
Noncombustible
Surround Facing
WITHOUT
Noncombustible
Surround Facing
Minimum Hearth Extension Dimensions
(for On-Site Construction)
G
HG
J
Seal cracks
between the
fireplace
and hearth
extension with
noncombustible
material
Safety strips
must overlap
56O" minimum
May install
noncombustible
decorative
covering
OR .018" min.
sheet metal FIREPLACE
HEARTH
COMBUSTIBLE
FLOOR
MINIMUM
INSULATION
VALUE "R"
4" MIN.
FP594
SR/SC
11/20/97
FIREBOX
OPENING
A - Min. clearance
to combustible
perpendicular wall
B - Min. clearance
to combustible
perpendicular wall when
using noncombustible wall shield*
SIDE
WALL SIDE
WALL
F**
C**
E
ED
4" BRICK
(Example material)
Combustible material permitted within shaded area.
* Noncombustible wall shield requires 1" EH2416 insulation
(minimum R Value = 1.85) between decorative
noncombustible rigid covering and combustible wall.
Minimum height and width is 40" x 40".
** Dimension/degree of angle will vary depending on thickness
of noncombustible surround facing.
4"
Shaded area starts
1/2" away from
edge of unit.
FP594
Combustible side wall protection and hearth extension dimensions.
16" 12" 48° 41° 18" 14" 7³⁄₄" 16" 48"
406 mm 305 mm 457 mm 356 mm 197 mm 406 mm 1219 mm
20" 12" 42° 35° 18" 14" 11¹⁄₂" 20" 61¹⁄₂"
508 mm 305 mm 457 mm 356 mm 292 mm 508 mm 1562 mm
Adjacent combustible side walls that are within the mini-
mum dimensions shown in Figure 24 of fireplace open-
ing must be protected with MHSC Wall Shield Model
SP40 or a specifically built wall shield described below.
The special wall shield design described in Figure 20 is
an alternate method of adding protection to side walls
and can be used in place of the SP40 with the same
wall clearances specified for the SP40. Rt must =1.85
minimum.
1. Manville - CERAFORM 126, K=.27,
1/2 inches thick
2. MHSC - EH2416, K = .458,
1 inch thick required.
A hearth extension is required to protect a combustible
floor in front of the fireplace. Refer to Figure 24 for mini-
mum dimensions and mounting detail.
The hearth extension described in Figure 24 must be a
durable noncombustible material with a minimum (total)
Rt value of 1.09; refer to Figure 25 for examples. The
overall height (above a combustible floor), depth and
width must be as indicated, with the extension centered
to the fireplace opening.
The top of insulation must be covered with a noncom-
bustible decorative covering a piece of .018” mini-
mum sheet metal, to protect hearth extension material.
(Fig. 24)
Secure the hearth extension to the floor to prevent
shifting, using trim molding or other similar means at
three (3) outer edges. Seal crack between the fireplace
hearth and hearth extension with a noncombustible
material. (Figs. 24 and 26)
17
ODWR Series Outdoor Woodburning Fireplaces
87D1502
Alternate noncombustible materials may be used pro-
viding the (total) thermal resistance (Rt value) of the al-
ternate material employed is greater than or equal to R
= 1.09. Thermal resistance (R) or thermal conductivity
(K), may be obtained from manufacturer of the material.
Factors are related by the formula K = 1/R.
T = given thickness
R = thermal resistance for a given thickness (T)
K = thermal conductivity
Noncombustible material with a lower R value may
be used, provided thickness of material is sufficiently
greater to maintain an equivalent (total) thermal resis-
tance (Rt).
To determine the thickness required for any mate-
rial:
NEW K of new material (per inch) Thickness
required = X of listed
thickness K of listed material (per inch) material
T (new) = 5.0/0.458 x 0/50 in. = (new required
thickness).
COMMON MATERIALS AND FACTORS
MATERIAL K* RMINIMUM
THICKNESS
EH2416
Common Brick
0.458
5.0
1.09 0.50 in.**
0.10 5.46 in.**
(MHSC)
R Value is for 1/2 inch.
* Units of K = BTU/SQ FT/HR/˚F/IN
** Thickness of Listed Material
FP533ADD
Addendum
6/1/99 djt
8/4/99 changed .2 to .1
one inch to 1/2 inch djt
FP533ADD
Hearth extension material factors.
FP550
Sealing gaps.
FP550
BR/BC - SEALING
DETAILS
9/29/97
Wall Covering
Noncombus-
tible Decorative
Facing
2 x 4 Header
(Do not notch
at standoffs)
Seal all cracks
between fireplace sur-
round and wall materi-
als with noncombus-
tible material
Noncombustible
Decorative Cov-
ering
Hearth Extension
Insulation
Safety Strips
Must be overlapped 1/2"
minimum
Seal crack between
fireplace and hearth
extension with noncom-
bustible material
18
ODWR Series Outdoor Woodburning Fireplaces
87D1502
Only unvented gas logsets which have been found to com-
ply with the Standard for Unvented Room Heaters, ANSI
Z21.11.2, are to be installed in this fireplace.
If installing an unvented gas log set, refer to statement below:
FP560
Gas line access.
1"
Min.
FP560
BR/BC
11/10/97
1/2"
Hole in Outer Casing
Gas Line
Tube
Ceramic
Knockout
Supply
Line
Repack Insula-
tion
Ceramic
Knockout
(Both sides)
Hole in
Casing
Monessen fireplaces are designed to accept a 1/2" (13
mm) gas line for installation of an approved gas appli-
ance. (MHSC manufactures a wide variety of gas logs
for use in Monessen Fireplaces.)
Be sure to have the appliance installed in accordance
with building codes.
Gas connection may enter from either left or right side
of the fireplace.
Locate appropriate gas line in the outer casing of fire-
place and remove insulation from gas line tube. (Fig.
27)
From inside the fireplace, locate the knockout on the
firebrick -- be sure you are on the appropriate or "gas
line" side of the fireplace. Using a flat bladed screw-
driver or small chisel and hammer, carefully tap around
the knockout until it loosens and falls out.
Install 1/2" (13 mm) certified gas pipe through opening.
After gas pipe installation is complete, use insulation
that was removed from gas line tube to repack space
around the pipe. Material should be inserted from
outside of the fireplace and packed tightly to totally seal
between the pipe and tube.
When installing an ANSI Z21.11.2 ventless ap-
pliance the finishing material used for the mantel must
be rated at 250°F or greater.
BTU input of a gas appliance installed in fireplace
should be rated less than 100,000 BTU/Hr.
Gas pipe installation is intended for connection to a
decorative gas appliance only when (1.) incorporating
an automatic shutoff device and (2.) complying with the
Standard for Decorative Gas Appliances for Installa-
tion in Vented Fireplaces (ANSI Z21.60) CSA draft
requirements for Gas-Fired Log Lighters for Woodburn-
ing Fireplaces (Draft No. 4, August 1993).
Decorative gas appliance should be installed in accor-
dance with the National Fuel Gas Code, ANSI Z223.1/
NFPA 54 (latest edition).
19
ODWR Series Outdoor Woodburning Fireplaces
87D1502
1
2
4
5
6
a
b
c
7
8
9
10
6811
ODSR parts
9/2/03 djt
d
11
e
3
1. Damper Weld Assembly RP199 RP199
2. Damper Bracket 3030176 3030176
3. Screen Rod (two per fireplace) 26D0138 26D0138
4. Screen Assembly (two per fireplace) 20006583 20006861
5. Screen Pulls 20002225 20002225
6a. Firebrick - Hearth 20005621 20005421
6b. Firebrick - Rear 20005627 20005462
6c. Firebrick - Right Side 20005626 20005461
6d. Firebrick - Left Side 20005625 20005460
6e. Firebrick - Ashlip 20005619 20005418
7. Top Brick Retainers (three per fireplace) 3030172 3030172
8. Cable Clips (four per fireplace) 20006869 20006869
9. Outer Collar Assembly (SK8 Chimney) 3030143 3030143
10. Basket Grate 20006701 20002230
11. O.S.A. Assy. 20003076 20003076
MHSC reserves the right to make changes in design, materials, specifications, prices and discontinue colors and products at any time, without
notice.
6811
20
ODWR Series Outdoor Woodburning Fireplaces
87D1502
The following accessories for this appliance are available from your local Monessen distributor. Should you need
additional information beyond what your distributor can furnish, contact: MHSC, 149 Cleveland Drive, Paris, KY
40361, Attn: Technical Services.
Glass Door - Standard Bi-Fold set Brushed Brass finish 36GDKBBSR (ODWR400)
(recommended for indoor use) 42GDKBBSR (ODWR500)
Black finish 36GDKBKSR (ODWR400)
(recommended for indoor use) 42GDKBKSR (ODWR500)
Polished Brass finish 36GDKDBSR (ODWR400)
(recommended for indoor use) 36GDKDBSR (ODWR500)
Pewter finish 36GDKSSR (ODWR400)
(recommended for indoor use) 42GDKSSR (ODWR500)
Stainless Steel 36GDKSSSR (ODWR400)
(recommended for outdoor use) 42GDKSSSR (ODWR500)
Outside Air Kit Complete kit for connection from fireplace AKU1
to out-of-doors
Chimney Adapter Converts fireplace to 3-wall system TWABR
Hearth Extension Insulation Provides hearth extension floor prtesi EH2416
Hearth Patch Compound Patch cracks in hearth HPC-1
Drain Pan Designed to be installed under unit to 20014194 (36" models)
shed water by means of containing and 20014195 (42" models)
piping away from structure.
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