AMERICAN METAL AMERI-VENT E Guide

1
ROUND AMERI-VENT
®
TYPE B GAS VENT
Model ‘E’ - Sizes 3" through 6"
Model ‘R’ - Sizes 7" through 30"
OVAL AMERI-VENT
®
GAS VENT - Model ‘O’
Size 4" - Type B, Type B 2x4, Type BW
Size 5" - Type B, Type B 2x4
Size 6" - Type B
Installation
& Assembly
Instructions
AMERI-VENT GAS VENT AND ACCESSORIES ARE FOR USE ONLY WITH
LISTED GAS FIRED APPLIANCES EQUIPPED WITH A DRAFT HOOD OR
OTHER APPLIANCES LISTED FOR USE WITH TYPE B GAS VENT.
AMERI-VENT GAS VENT AND ACCES-
SORIES ARE NOT TO BE USED WITH
INCINERATORS OR WITH APPLIANCES
BURNING SOLID OR LIQUID FUELS.*
Vent sizing and installation are to be made in accordance
with all applicable local building codes. For further
information, please consult the National Fuel Gas Code
(NFPA 54).
USAGE
Ameri-Vent Gas Vent and fittings are intended to form a
continuous passageway from the gas appliance to the
termination of the vent above the roof, including the vent cap.
This symbol on
the product means
the product is
listed by
Underwriters
Laboratories, Inc.
*For fuels other than gas, write for Ameri-Tec orVSI Chimney Information.

2
1. Adequate air supply must be provided for combustion
and venting of appliance.Local codes or NFPA 54 specify
minimum requirements for combustion ventilation and
dilution air.
NOTE: Failure to provide adequate air may result in
extreme hazards to life.
2. Ameri-Vent GasVent is suitable for installation inside
or outside.However,the sizing tables in NFPA 54 are for
vents not exposed to the outdoors below the roof line.
Outside vents could reduce venting action; therefore,
such installations are not recommended. In the event
outside venting is necessary, vents should be sized as
close to maximum capacity as possible.Whenever pos-
sible outside vents should be enclosed inside a chase
which maintains the minimum one (1) inch clearance to
combustibles. Appliances served by an outside vent
must have an adequate air supply to balance inside
and outside air pressure to reduce the possibility of
reverse venting action.
3. The vent should be sized for the sea level name
plate input rating of the appliance in accordance with
the procedures set forth in NFPA 54 (The National Fuel
Gas Code), or the American Metal Products Gas Vent
Capacity Tables (EP-GVC).
4. When installing, make sure arrow on the Ameri-Vent
part is pointed up or away from the appliance.
5. When installed as a Type B Gas Vent, a minimum of
one (1) inch air space clearance to combustible mate-
rial is required. For Type B 2x4 and BW Vents see
Section 2, page 9 for clearance to combustibles. All
locking joints are to be securely snap-locked together.
See the rear page of these instructions for detailed
information about locking and unlocking vent sections.
The first vent section must be screwed to the appliance
outlet collar.
6. Ameri-Flex Model FC Gas Vent Connector should
be installed in accordance with our installation instruc-
tions. Unlisted single wall connector pipe shall be
securely supported and joints fastened with sheet
metal screws, rivets or other approved means. At the
point of connection of the single wall connector pipe to
the double wall gas vent, three sheet metal screws or
rivets may be used as an approved means.
NOTE: Do not use sheet metal screws at the lock
joints of Ameri-Vent Model E, R, and O Gas Vents
7. Wherever possible, install vertical vents directly
above appliances before beginning any lateral runs.
Lateral venting should be kept to a minimum to avoid
vent resistance. Horizontal runs to vents should either
be in accordance with the appropriate tables in NFPA
54, or should not exceed 75% of the vertical height of
the vent. Laterals should be supported. Excessive
General Installation Guidelines
number of fittings, such as elbows and tees, should be
avoided.
8. Maintain a pitch or rise from the appliance to the vent
cap on horizontal runs.The pitch shall not be less than 1/4
inch to the foot.
9. Vents must terminate vertically above the roof line.
Refer to theTermination ofVent Structure section on page
10 for details.
10. Strap or support vents securely in position to maintain
a minimum of one (1) inch air space clearance to
combustibles.
11. Firestops must be used where vents pass through
floors or ceilings.
12. More than one gas appliance may be vented into a
common vent. Close attention should be paid to vent
sizing to assure adequate venting action.
13. Portions of gas vents which may extend through
accessible spaces are to be enclosed to:
a) Maintain the one (1) inch minimum air space
clearance.
b) Avoid personal contact with the vent.
c) Avoid damage to the vent.
IMPORTANT:The enclosure must provide a minimum
of one (1) inch air space to all combustible material
and building insulation. Refer to section 2, page 9 for
Type B 2x4 and BW clearances.
14. In many types of buildings, such as multi-family
residential, high-rise and others, vents which pass through
floors or ceilings must be located in fire rated shafts or
chases with no openings, except for inspection access.
Consult local building code for proper wall construction,
access, clearance, support, initial penetration of breeching
and method of termination, or refer to the National Fuel
Gas Code (NFPA 54).
15. Never vent gas appliances into an unlined masonry
chimney. Install eitherType B Gas Vent or a listed metal
relining system inside chimney to reduce condensation
and reduce the chances of improper venting which could
occur in unlined chimneys.
NOTE: While handling sheet metal parts, it is
advisable to wear gloves to avoid personal injury
from sharp edges or projections.
16. If a power vent fan is used, make sure it is located at
the terminus so as to maintain negative pressure within
the vent.
17. The gas venting system should be inspected prior to
the heating season by a qualified technician. This
inspection should include removal of the cap to confirm an
unrestricted vent.

fit between 16 inch on-center joists.Ameri-Buckets in size
9 inch and larger do not use hangers.Instead, they must
be nailed in place into a properly sized, framed-in
opening. Ameri-Buckets in sizes 3 inch through 8 inch
may also be nailed in place into a properly sized, framed-
in opening as an alternative to using bucket hangers.
Installations Using Ameri-Buckets (AB) with Hangers
(ABH) (Sizes 3 inch through 8 inch only)
1. Check to see that center-to-center distance between
joists is 16 inches nominal.
2. Bend the four rectangular tabs inward on Ameri-
Bucket. This will center vent pipe and maintain 1 inch
minimum clearance to outside wall of Ameri-Bucket.See
Fig. 1.
3. Place U-shaped hanger bars through pairs of openings
in the side of the Ameri-Bucket.Note that open portion or
U-shaped bar faces downward. Do not use rectangular
openings with inward-bent tabs. Instead, pass hanger
bars through closest pairs of plain openings as shown in
Fig. 2.
4. Nail both hanger brackets into sides of joists.Bottom
edge of brackets should be even with bottom edge of
joists. Use four nails per bracket, nailing through small
triangular-shaped openings in brackets.DO NOT RELY
ON TRIANGULAR-SHAPED BARBS TO HOLD
BRACKETS IN PLACE. BRACKETS MUST BE
NAILEDTO JOISTS. See Fig. 3.
5. Snap hanger bars into slots in hanger bracket.
3
Installation
Beginning Vent Structure
with the Connector or
Breeching System
Singlewall Connectors
Connect the Singlewall to the draft hood of the appli-
ance with three (3) sheet metal screws. Each joint of
the singlewall system must be connected with three (3)
sheet metal screws. Singlewall connector must not
penetrate any walls or ceilings, or be used in any cold
or non routinely inspected areas. Singlewall connector
pipe may extend to the first point of penetration of
structure where the use of a firestop and support
assembly are required. If using Ameri-Flex Connector
System, refer to Ameri-Flex Model FC Installation
Instructions.
Type B GasVent Connectors
Attach the vent section directly to the draft hood of the
appliance with three (3) sheet metal screws. Allow a
minimum of one (1) inch air space clearance to
combustibles.Where the vent penetrates structure use
the Support Plate to maintain proper clearance at this and
successive intervals throughout the structure.
Section 1
Models E & R Round
BasicVent Structure
Ameri-Vent Type B Gas Vent sizes are specified by the
inside pipe diameter. Model E is available in sizes 3"
through 6" diameters and has a 1/4" air space between
pipe walls. Model R is available in sizes 7" through 30"
diameters and has a 1/2" air space between pipe walls.
When calculating the assembled length, allow 1" length
reduction for the overlap at each joint.
Support of Vent Structure
American Metal Products offers three different types of
supports as explained below.In addition, field-fabricated
supports may be used. Consult local building codes for
applicable regulations regarding field-fabricated supports.
Directions for Installing Ameri-Buckets
NOTE: Ameri-Bucket Hangers (ABH) are available for
sizes 3 inch through 8 inch only.Hangers are designed to
FIG. 1 FIG. 2
BENDTABS
INWARD
FIG. 3
16 INCHES NOMINAL
HANGER
BRACKET
NAIL 4
PLACES
PER SIDE
JOIST

4
Installation Using Ameri-Bucket
Without Hangers
1. Completely frame in (on all four sides) a properly-sized
square opening.Select opening size so that outside wall
of Ameri-Bucket will contact framing at four sides. See
Fig. 4.
2. Position Ameri-Bucket through opening so that bottom
of Bucket will be flush with, or a little below, bottom of
ceiling.
3. Nail through sides of Ameri-Bucket into framed-in
opening. Nail on all four sides, using a minimum of two
nails per side (8 nails total, minimum).
Bucket Connectors
The Bucket Connector (BC) is used to make the
connection of either Ameri-Flex single wall connector
pipe, or Ameri-Vent Type B Gas Vent, utilized as
connector, through the bottom of the Ameri-Bucket.
1. The Bucket Connector is installed by positioning it
against the bottom of the Ameri-Bucket, as shown in Fig.
5with the mounting tabs against the bottom of the bucket.
2. Position the inner wall of the Bucket Connector inside
the bottom end of the inner wall of the B Vent section
through the hole in the bottom of the bucket. Attach the
mounting tabs with sheet metal screws.
3. Provide additional strapping or hangers for connector
offsets.
Firestop Supports
The Firestop Support (FSP) and Support Bracket (SB)
are designed for use withType B GasVent in sizes 3 inch
diameter through 8 inch diameter.
When used by itself, the Firestop Support (FSP) serves
as a firestop, while maintaining one inch clearance to
combustibles from the outer wall of theType B GasVent.
When the Firestop Support (FSP) is used with the
Support Bracket (SB), this combination of parts serves as
both a firestop as well as a support. Each support is
designed to support up to 20 feet of vent pipe when
installed as follows:
1. It is recommended that theVent Pipe be supported at
least every other floor. The distance between supports
must not, in any case, exceed 20 feet.
2. Frame in an opening providing one inch clearance to
Ameri-VentType B GasVent.See Fig. 6,Table 1.
Table 1
VENT SIZE “A" SQUARE
3E 51⁄2 inches
4E 61⁄2inches
5E 71⁄2inches
6E 81⁄2inches
7R 10 inches
8R 11 inches
3. Secure Firestop Support (FSP) as shown in Fig. 7
Install strapping (minimum 3/4 inch, 28 gauge) through all
four slots in collar and nail as shown or nail at all four slots
as shown in Fig. 8.

5
FIG. 7
FIG. 8
NAIL STRAPPING
IN PLACE
(FOUR PLACES)
NAILTHROUGH
SLOTS (FOUR
PLACES)
with Support Bracket is used.(See Fig. 9.) This provides
relief for linear thermal expansion.The adjustable length
section should be positioned directly under the Vent Pipe
section which is being supported.(NOTE:When installed
with the entire vent in a vertical position as shown in Fig.
9, the bottom end of the adjustable length sections should
not be secured with the clamp or screws provided.This
will allow movement to compensate for expansion. See
section titled “Adjustable Length Sections”on Page 7.)
Round Support Plates
The Round Support Plate (RSP) Support is designed for
use with 9 inch diameter and larger Type B Gas Vent.
Each support is designed to support up to 30 feet ofVent
Pipe when installed as follows:
1. It is recommended that theVent Pipe be supported at
least every other floor. The distance between supports
must not, in any case exceed 30 feet.
2. The circular cutout in the Round Support Plate is
designed to engage the uppermost recess in the female
end of theVent Pipe.(See Fig. 10.)
3. Surround the Vent Pipe with the two identical Support
Plate halves.(See Fig. 11.) Engage the plate edges in the
uppermost pipe recess as described in Step 2. Use two
pair of bolts and nuts to hold the plate halves together.
(Four predrilled tabs are provided for this purpose.)
4. Pass Ameri-Vent Type B Gas Vent through opening in
Firestop Support (FSP).
5. NOTE: If used as a support, install Support Bracket
(SB) as shown in Fig. 6.Clamp bracket securely to pipe
section using the pair of bolts and nuts provided.
For installations with multiple supports, an adjustable
length section of Type B Gas Vent should be installed
between each pair of locations where a Firestop Support
FIG. 9
FIRESTOP SUPPORT
WITH SUPPORT BRACKET
20 FEET
MAXIMUM
20 FEET
MAXIMUM
APPLIANCE
DRAFT HOOD
ADJUSTABLE LENGTH
SECTION
FIRESTOP SUPPORT
WITH SUPPORT BRACKET
ADJUSTABLE LENGTH
SECTION
FIRESTOP SUPPORT
WITH SUPPORT BRACKET
ADJUSTABLE LENGTH
SECTION

6
FIG. 12
ROUND
SUPPORT
PLATE
ADJUSTABLE
LENGTH
SECTION
30 FEET
MAXIMUM
30 FEET
MAXIMUM
APPLIANCE
DRAFT HOOD
ROUND
SUPPORT
PLATE
ADJUSTABLE
LENGTH
SECTION
ROUND
SUPPORT
PLATE
ADJUSTABLE
LENGTH
SECTION
4. Mounting holes are provided around the perimeter of
the Round Support Plate. Use appropriate fasteners to
secure the Support Plate halves to the opening between
floors.(NOTE: Round Support Plates should be attached
to theTOP of the opening only.See Fig. 12.)
5. For installations with multiple supports, an Adjustable
Length Section of Type B Gas Vent should be installed
between each pair of locations where a support is used.
(See Fig 12.) This allows the location of the pipe recess
to be in the proper position at each opening where a
support is to be used.The Adjustable Length Section also
provides relief for linear thermal expansion. The
Adjustable Length Section should be positioned directly
under the Vent Pipe Section which is being supported.
NOTE: When installed with the entire vent in a vertical
position as shown in Fig. 12, the clamps on Adjustable
Length Section should be left loose to allow for
expansion. (See section titled “Adjustable Length
Sections" on Page 7.)
Vent Pipe Hanger and
Support Bracket Assembly
TheVent Pipe Hanger (VPH) (sizes 3 inch through 7 inch)
and the Support Bracket Assembly (SBA) for 8 inch
through 12 inch Type B Gas Vent are used to provide
lateral and some vertical support for sections ofVent as
well as to provide for the correct clearance to combustible
materials. They also provide support and resupport for
offsets and horizontal runs.
FIG. 10
UPPERMOST
RECESS
FIG. 11

2. When the Universal Adaptor is in place, tighten the
fastener securely.
3. The Universal Adaptor is not intended to act as a
structural member and the Vent installation should be
resupported.
Increasers
An Increaser (IX) is used to make a transition from a smaller
vent diameter to a larger vent diameter.The Increaser is
available in steps up to a maximum of four (4) sizes larger.
For example - a 4 inch diameter vent can be increased with
a single Increaser from 4 inch to 8 inch or 5 inch to 9 inch.
7
Adjustable Length Sections
Adjustable Length Sections (12A and 18A) of Type B Gas
Vent are available to allow for installation where fixed-length
sections do not produce the desired dimensions.Sizes 3 inch
through 8 inch use a single sheet metal screw which should
be screwed into the mating section ofType B GasVent.Oval,
9 inch diameter and larger Adjustable Lengths use a clamp-
ing method consisting of a screw and tabs to draw the outer
wall tightly around the mating section of Type B Gas Vent.
Adjustable Length Sections may also be used to com-
pensate for linear thermal expansion between two
fixed points in the vent system. Examples of this are
shown in Figures 9 and 12. In these examples the
fastening/clamping devices are not used. This allows
for expansion between two fixed supports or between
a fixed support and the appliance. Note that the fas-
tening/ clamping means should be left loose only if the
Vent and the Adjustable Length Sections are installed
vertically.If the Adjustable Length Sections are used in
a position other than vertical, such as between offsets,
the fastening/ clamping means should be used.
Finally, when joining an Adjustable Length Section to
another section of Type B Gas Vent, make sure that
there is a minimum overlap of two inches.
Firestopping
All Type B Gas Vents passing through floors, ceilings or
within vertical stud walls must be firestopped at floors
or ceilings. The Firestop must effectively close the
opening between the outer wall of theVent Pipe and the
hole cut in the structure. In attics, the Firestop should
be placed on top of the framed ceiling opening to pre-
vent insulation and debris from coming into contact with
the Vent Pipe. At all other locations the Firestop should
be at the bottom of the framed opening.
NOTE:The Firestop Support Plate Assembly (FSP),
The Support Plate, or Vent Collar functions as a
Firestop at the location where it is installed.
Wall Thimble
The Wall Thimble (WT) is available to use where a
Type B Gas Vent passes through a vertical wall. The
Wall Thimble will provide for the proper clearance to
combustible material as the vent passes through the
wall, and will also act as a firestop for the vent.
Universal Adaptors
The Universal Adaptor (EUA-M and EUA-F) is avail-
able in sizes 3 inch through 6 inch in both male and
female versions. The Universal Adaptor may be used
to connect Ameri-Vent round Type B Gas Vent to other
manufacturers listed Type B Gas Vent as shown in
Table 2.
1. The Universal Adaptor is installed as shown in Fig. 13
by sliding the Adaptor over the outside wall of the other
listed Type B Gas Vent. For the Male Adaptor the inner
wall goes inside the other GasVent, while the inner wall
for the Female Adaptor goes around the outside of the
bottom end of the inner wall of the other GasVent.
ANY OFTHE LISTEDTYPE B
GASVENTS SHOWN ABOVE
INTABLE 2.
AMERI-VENT
UNIVERSAL ADAPTOR
FEMALE
EUA-F
AMERI-VENT
TYPE B GASVENT
TIGHTEN
FASTENER
SECURELY
AMERI-VENT
TYPE B GASVENT
AMERI-VENT
UNIVERSAL ADAPTOR
MALE
EUA-M
FIG. 13
Table 2
1. General Products - Air Jet
2. Hart & Cooley - Metlvent
3. Selkirk Metalbestos - Household Mfg., Eljer
4. Metal Fab
5. Mitchell Metal Products - MitchVent
6. Simpson Dura Vent
7.White Metal Products -Twin Stacks
8. GSW - Jakes - Evans
Tees and Wyes
Model E and R Tees (T) and Wyes (Y) are designed for
breeching or as connectors for vertical, sloped, or horizontal
systems. They can also be used to provide access for
inspection or drain fittings.Tees andWyes must be isolated
from expansion forces by supporting as needed and with
Adjustable Length Sections.Any unused open end of the
Tee orWye should be closed off with aTee Cap.(TC)

8
Elbows and Offsets
Ameri-Vent Type B Gas Vent Model E - sizes 3 inch
through 6 inch, and Model R in sizes 7 and 8 inch, is
available in both a 45°and 90°fully adjustable offset.The
9 inch through 14 inch Model R is only available in a 45°
adjustable elbow.The 16 inch and larger is available in
45°non-adjustable elbow.SeeTables No.3 and No.4 for
relative dimensions of offsets and combinations of offsets.
Whenever Model E or R GasVent Pipe is changed from
a vertical direction, theVent system must be resupported
before and after the change in direction.The support
should provide rigid stability, both vertical and horizontally
- see Fig 14. Check with your local Building Officials to
make sure any alternative support method is acceptable.
TERMINATION OFVENT MUST BE
SECURELY GUYED OR BRACED IF IT
EXTENDS MORETHAN (5) FEET
ABOVE ROOF.
SEE
TERMINATION
TABLE
SEAL AROUND
COLLAR &
FLASHINGS
MAINTAIN
1" CLEARANCE SUPPORT
LATERALS
TERMINATE
VENT
AT LEAST
5 FT.ABOVE
DRAFT HOOD
FIRESTOP
SUPPORT
ASSEMBLY
VERTICAL
VENT
DRAFT HOOD
CONNECTOR
LISTED
APPLIANCE
ADEQUATE
AIR SUPPLY
FIG. 14
MAXIMUM OFFSET IN INCHES
WithTwo
45°
Vent Elbows One One One One One One One
Size A B ONLY 6" Length 12" Length 18" Length 24" Length 3' Length 4' Length 5' Length
33 2
3⁄431⁄463⁄411 151⁄4191⁄228 361⁄245
43
7⁄831⁄16 31⁄4711 1⁄4151⁄2193⁄4281⁄4363⁄4451⁄4
53
1⁄431⁄441⁄473⁄412 161⁄4201⁄229 371⁄246
64 3
13⁄16 41⁄2812 1⁄4161⁄2203⁄4291⁄4373⁄4461⁄4
74
5⁄16 41⁄458 1⁄2123⁄417 211⁄4293⁄4381⁄4463⁄4
84
3⁄449⁄16 51⁄2913 1⁄4171⁄2213⁄4301⁄4—47 1⁄2
95 5 6 —13
3⁄418 221⁄4303⁄4——
10 57⁄853⁄871⁄4—15 19
1⁄4231⁄232 — —
12 6 53⁄871⁄4—15 19
1⁄4231⁄232 — —
14 65⁄861⁄281⁄2—16
1⁄4201⁄2243⁄4331⁄4——
16 7 7 91⁄4—17 21
1⁄4251⁄234 — —
18 79⁄16 71⁄210 — 173⁄422 261⁄4343⁄4——
20 81⁄285⁄8101⁄4—18 22
1⁄4261⁄235 — —
22 8 75⁄8101⁄4—18 22
1⁄4261⁄235 — —
24 85⁄885⁄16 111⁄4—19 23
1⁄4271⁄236 — —
26 9 9 12 — 193⁄424 281⁄4363⁄4——
28 91⁄291⁄2123⁄4—20
1⁄2243⁄429 371⁄2——
30 10 10 131⁄2—20
1⁄4251⁄2293⁄4381⁄4——
WITH 2 45° ELBOWS AND:
Table 3
CODE NO. SIZE A B C D
3EAL 3" 5" 51⁄4"1
1⁄2"8"
4EAL 4" 5" 51⁄2"1
3⁄4"8 3⁄4"
5EAL 5" 51⁄2"6" 2
1⁄4"9 1⁄4"
6EAL 6" 61⁄2"7" 2
1⁄2"10 1⁄4"
7RAL 7" 73⁄4"8" 3" 12
1⁄4"
8RAL 8" 83⁄4"9" 3
1⁄4" 13"
C
BD
A
Table 4
OFFSET
VERTICAL
RISE
45°
A
B
Note:The vertical rise
can be closely estimated
by adding one “A” and
one “B” dimension to
Maximum Offset.
B

Installation ofType B 2 x 4 GasVent
1. Cut out the ceiling plate in the space where theVent is
to be installed.
2. Nail a 2x4 support (A) at the desired height between
the studs - see Fig. 15.
3. Attach theTee Support (B), the Tee (C) with the Oval
Tee Cap, and theVent Pipe (D) as shown on Fig. 15 .
4. At each floor level above the Tee install the Firestop
Spacer (E) as shown in Fig. 15.
NOTE: Provide at least 1 inch clearance around the
Tee branch where it passes through combustible wall
construction.
Type B-W GasVent - 4" Oval
Ameri-Vent (Model O) GasVent may be installed within a
standard 2x4 stud wall if all the following conditions are
met:
1.Arrows on Ameri-Vent parts should always point up.
2.Stud bay must be a 16 inch on center stud bay.
3.2x4 studs must be a minimum of 3.5 inches deep.
4.There must be nothing else in the stud bay other
than theVent and furnace.Note: this includes any type
of insulation.
5.The installation must contain an Oval Hold Down Plate
(4OHD) at the base, Oval Plate Spacers (4OPS) at the
first ceiling level, and Firestop Spacers (4OPS) at any
additional floor levels.See Fig. 16 and 17. 9
Section 2
Model ‘O’ Oval
Basic Vent Structure
Ameri-Vent (Model O) Oval GasVent is available in sizes
4, 5, and 6 inch.The individual sizes reflect the flow rate
capacities equivalent to 4 inch, 5 inch, and 6 inch Round
Type B Gas Vent.The joint of the Model O Type B Oval
GasVent takes up one inch when assembled.The Model
O Gas Vent is UL listed for the following applications and
clearances to combustibles as shown in Table 5.
Type B Oval GasVent
Type B Oval GasVent is available in sizes 4, 5, and 6 inch,
and requires a 1 inch clearance to combustibles. This
includes all Vent Sections, Elbows,Tees, and Adaptors.
When used as Type B Gas Vent, Model O must follow all
of the same requirements as round Type B Gas Vent,
such as the necessity of using firestops at each floor level.
See Section No. 1
Type B 2 x 4 GasVent - 4" or 5" Oval
Four and five inch Ameri-Vent (Model O) Gas Vent may
be installed within a standard 2x4 stud wall if all the
following conditions are met:
1.Arrows on Ameri-Vent parts should always point up.
2.Stud bay must be a 16 inch on center stud bay.
3.2x4 studs must be a minimum of 3.5 inches deep
4.There must be nothing else in the stud bay other than
the Vent Section. NOTE: this includes any type of
insulation.
5. The Firestop Spacer (FS) must be installed at each
floor level - see Fig. 15.
NOTE: Only the straight Vent Pipe Sections with or
without the OvalTee may be used inside the stud bay
with reduced clearances to combustibles - see Fig.15.
UNDERWRITERS LABORATORIES LISTED
MINIMUM CLEARANCES FROM COMBUSTIBLES
DESCRIPTION TYPE MINIMUM CLEARANCE
Oval Ameri-Vent B 1"
(Sizes 4", 5", and 6" )
4" & 5" Oval Ameri-Vent Clearances as
(When installed in 2x4 stud B2x4 determined by use of
wall with other than 4OFS or 5OFS Firestop
recessed heater) Spacers at each
ceiling level
4" Oval Ameri-Vent Clearances as
(When installed in 2x4 stud B-W determined by
wall with recessed heater) use of 4OHD hold
down plate, 4OPS
ceiling plate spacers and
4OFS firestop spacers
Table 5
FIG. 15
A
B
C
D
E

10
Installation ofType B-W GasVent
1. Cut out the ceiling plate at the floor level above the
heater flush with studs in space where Vent is to be
installed.
2. Nail one Ameri-Vent Plate Spacer (40PS), (A), across
cut out area in ceiling plate - see Fig. 16.
3. Snap Hold Down Plate (4OHD), (B), onto bottom end
of Ameri-Vent pipe as shown in Fig. 16. Install Vent
Section in position. Use two No. 8 binder head sheet
metal screws to attach Hold Down Plate firmly to Furnace
header plate through pre-punched holes.
4. Nail second Ameri-Vent Plate Spacer across cutout
ceiling plate as shown in Fig. 16.
5. If theVent is to continue additional stories within a 2x4
stud space, install Firestop Spacers at the second and
subsequent ceiling levels as shown in Fig. 17.
6. After passing through the last Firestop Spacer, theVent
may be finished with either round or oval Ameri-Vent
fittings, flashings and Ameri-Cap. (Round pipe, fittings,
flashings and vent caps cost less than corresponding oval
parts.)
Attic Insulation Shield
In some areas the building code requires the use of an
attic insulation shield (AVS) on single story Type B-W
installations.
Termination of Vent Structure
The Ameri-Vent Gas Vent is available for most Models
and sizes in two styles of Termination Tops, Ameri-Cap
and Universal Cap.The Ameri-Cap is a lock neck design
with the same lock as the female end of theVent sections.
The Universal Cap is designed to fit inside the inner wall
of the vent sections.
American Metal Products 12" and smaller Gas Venting
Systems using either the Ameri-Cap or the Universal
Cap, may terminate in accordance with Table 6 and
Figs. 18 & 20.
Multi-Story
Type B-W
Installations
AT SECOND AND
SUBSEQUENT CEILING LEVELS
USE 40FS FIRESTOP SPACERS.
AT FIRST CEILING LEVEL
USE 40PS CEILING
PLATE SPACERS.
A
BType B-W
Installation
Roof Pitch Minimum Height
Flat to 7/12 1.0 feet
over 7/12 to 8/12 1.5 feet
over 8/12 to 9/12 2.0 feet
over 9/12 to 10/12 2.5 feet
over 10/12 to 11/12 3.25 feet
over 11/12 to 12/12 4.0 feet
over 12/12 to 14/12 5.0 feet
over 16/12 to 18/12 6.0 feet
over 18/12 to 20/12 7.0 feet
over 20/12 to 21/12 8.0 feet
Table 6
Ameri-Cap 12" and Smaller
GasVentTerminationTable
FIG. 17
FIG. 16

11
1. To ensure a waterproof roof structure, use the
appropriately sized flashing and storm collar where the
vent penetrates the roof.Place the Storm Collar over the
vent until it is level. Apply a thick horizontal ring of non-
hardening, high temperature mastic around the vent at
the top of the Storm Collar.
2. Vents in excess of 5 feet above the roof should be
securely guyed to prevent unnecessary movement.
Attach guying to the vent.Never attach guying to the cap.
3. To prolong life and appearance of galvanized steel
parts located outside, use proper painting procedure:
a. Remove oil and dirt with a solvent
b. Paint with primer specifically recommended
for adhesion to galvanized steel
c. Apply finish coat
Checking Vent Operation
After adjusting appliance and lighting main burner, allow
several minutes for warm-up, to begin venting action.Hold
a lighted match along the rim of the draft hood relief
opening of the appliance. Proper venting will draw the
flame up or into the draft hood. Improper venting,
indicated by escaping or spilling of burned gas, will cause
the match to flicker or go out.When consulting Standard
NFPA 54, follow procedures for conducting safety
inspections of existing appliances and placing equipment
in operation, paying particular attention to the section
titled -
Checking the Draft.
FIG. 18
FIG. 19
FIG. 20
8' MIN
10' OR LESS
2' MIN.
2'
MIN.
WALL OR
PARAPET
10' MIN.
Ameri-Caps 12" and Smaller
The vent termination should not be less than 8 ft.
from a vertical wall.
SEE GASVENT
TERMINATIONTABLE
NOTE:
NO HEIGHT ABOVE
PARAPET REQUIRED
WHEN DISTANCE FROM
WALLS OR PARAPET IS
MORETHAN 10'
2' MIN.
Ameri-Caps larger than 12" must be located at least 2 feet above the
highest point where they pass through a roof and at least 2 feet higher
than any portion of a building within a horizontal distance of 10 feet.
Ameri-Caps 3" thru 30"
2' MIN.

8601 Hacks Cross Road Olive Branch. Mississippi 38654 • [phone] • Fax [phone]
Technical Service Questions [phone]
TO UNLOCK JOINT
1. Line up pipe ends.
(Embossed arrows must
point up or away from the
appliance.)
1. On sizes up to 7",pry out
the 3 teeth marked with
dots. For larger sizes, pry
out all teeth.
2. Rotate joint slightly while
pulling gently apart.
2. Press together until
couplers SNAP-LOCK. 3. Pipes are now firmly connected.
FORM NO.100571D BVERO-II ©COPYRIGHT 1999 AMERICAN METAL PRODUCTS
Model O
Model E and R
1. Place female
coupler over
preceding male
coupler.
2. Press other side of
pipe down until joint
seats.
3. Press other side of
pipe down until joint
SNAP-LOCKS.
1. Insert screwdriver
one inch into joint
as shown.
2. Press firmly inward with
blade of screwdriver and
pry upwardsVERY
SLOWLY AND GENTLY
Joint will slowly separate
without damage.
Locking and Unlocking Instructions
TO LOCK JOINT
TO LOCK JOINT TO UNLOCK JOINT