Northline Express EXHAUSTO RS 9 Instructions for use

Application Manual
for
Mechanical Venting of Fireplaces, Stoves,
BBQ's and Pizza Ovens
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EXHAUSTO
TABLE OF CONTENTS
Introduction 1
Section 1: Smoke - Problems & Causes 3
Chimney performance........................................................ 3
Chimney performance problems ........................................ 3
Section 2: Applications for the Chimney Fans 6
Uses for the chimney fan................................................... 6
Typical applications........................................................... 6
Section 3: Technical Data & Specifications 7
Technical description........................................................ 7
Dimensions & electrical data........................................... 7
The chimney fan as an obstruction................................... 7
Capacity charts................................................................ 8
Sound diagram................................................................ 8
Section 4: How To Select Chimhey Fan Size 9
Fireplaces....................................................................... 9
Stoves and fireplace inserts............................................ 10
Wood-fired pizza ovens.................................................... 10
Other applications........................................................... 10
Fan selection tables for fireplaces................................... 11
Fan selection tables for stoves etc. ................................ 12
Section 5: Installation Instructions 13
Installation of the chimney fan......................................... 13
Installation on brick chimney........................................... 13
Installation on steel chimney........................................... 14
Special applications........................................................ 14
Section 6: Wiring of the chimney fan 16
Materials needed for solid fuel installations..................... 16
Materials needed for non-solid fuel applications.............. 16
Connection diagram....................................................... 16
Wiring diagram for chimney fan controlled by
motor speed control....................................................... 17
Wiring diagram for chimney fan controlled by
motor speed control and fan proving switch................... 17
Adjusting the fan proving switch setting.......................... 18
Section 7: Using The Chimney Fan - Care & Cleaning 19
How to start a fire.......................................................... 19
Cleaning intervals.......................................................... 19
Cleaning the chimney fan.............................................. 19
Appendix A: Design Theory............................................................... 21
Appendix B: Conversion of rectangular flues...................................... 25
Appendix C: Resistance coefficients.................................................. 26
Appendix D: Parts List....................................................................... 27
Appendix E: Trouble shooting............................................................ 29
Appendix F: Warranties..................................................................... 31
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INTRODUCTION
The primary aim of this application manual is to
providemoredetailedguidanceonmechanicalventing
of wood-fired appliances than can be found in the
codes or in the appliance manufacturers' instructions.
It is intended for the convenience and assistance of
contractors, chimney sweeps, building inspectors, ar-
chitects, engineers, and others concerned with the
correct installation and configuration of EXHAUSTO
Chimney Fans.
The manual contains extensive information about
chimney problems, how they can be solved, how to
analyze and calculate fireplace chimney systems. It
also contains information about how to adapt chimney
fans for different applications.
Finally,forthosewhohaveaninterestinatheoreti-
calapproach,themanualsappendixcontainsrelevant
theory regarding fireplace chimney systems.
Definition of Mechanical Venting
While used for decades in Europe, mechanical
venting of fireplaces and stoves is relatively new in
USA.Buildingcodes,ANSIandNFPAstandardshardly
mention "mechanical venting". And, when mechanical
ventingismentioneditisreferredtoas"draftinducing",
which leads to "draft inducing equipment".
"Draftinducer"hasbecometradenameforapaddle-
wheel fan that is inserted into the flue between the
appliance outlet and the chimney termination.
There is still a misconception about mechanical
venting. Many professionals still don't understand the
difference between draft inducers and chimney fans.
Theseareourdefinitionsthatshouldexplainthemajor
differences:
Draft Inducer: "A fan or ventilator that is installed
betweentheapplianceoutletandthechimneytermina-
tion. The draft inducer creates a negative pressure on
theinletsideandapositivepressureontheoutletside."
Chimney Fan: "A fan or ventilator that is installed
atthechimneytermination.Thechimneyfan creates a
negative pressure in the entire chimney system".
Obviously,bypressurizingthefluethedraftinducer
can not be used in any stack or chimny flue that is
exposed to living quarters. Using an in-line draft in-
duceralmostalwayscreatesproblemswithwarranties
provided by stack and chimney manufacturers, and if
the chimney system is listed the installation of a draft
inducer will definitely void the listing. Further, the draft
inducer is neither made nor designed for use in a dirty
environment with creosote.
EXHAUSTO
3
On the other hand, a chimney fan can be used on
any type stack or chimney flue because it does not
pressurize anything.
There seems to be no doubt that mechanical vent-
ing will be a part of many venting installations in the
future.In Europe, mechanicalventingis a growtharea
and we see the same trend here for commercial
applications as well as for residential applications.
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EXHAUSTO
SECTION 1: SMOKE - PROBLEMS & CAUSES
relatively small inlets, and therefore the draft must be
strong.
These are some typical performance problems:
n The chimney flue is too small.
A chimney may be severely restricted if the inner
diameter of the flue is too small. This situation often
occurswhenachimneyisre-lined,andtheflueopening
thereby is reduced.
In this situation, the velocity of the flue gases
reaches a point where the flow resistance is so sub-
stantial that the flow resistance exceeds the draft.
Aruleof thumb for maximumvelocityis1,800FPM
in the flue.
Itiscommonbeliefthattheactualareaofachimney
flue determines the capacity of the chimney. The
shape of the flue is also important when determining
the required area.
An 8"x12" flue has an area of 96 sq.in., while an 8"
round flue has an area of 50 sq.in., or roughly 50% of
the capacity of the 8"x12" flue.
However, the corners in a rectangular duct are
counter-productive and add to the resistance.
Analternativetojustcalculatingtheareaoftheflue
openingoftherectangularflue is to use the areaofthe
largest round flexible tube that can be inserted. (this is
meantasaguidelineandhasnothingtodowiththesize
liner that can be installed. In technical term this is
referred to as the "hydraulic diameter").
Refer to Appendix B, pg. 25: "Conversion of Rect-
angular Flues".
n The chimney flue is too large
Whileincreasingfluesizeincreasesthe capacityof
a chimney by reducing the flow resistance, it will
decrease draft. Gases move more slowly in a large
flue, and will maintain a lower average temperature
since they have more time to cool.
Extremecoolingcanoffset the gain in capacityand
could even lead to a net decrease in draft.
This phenomena is typical where a stove or fire-
place insert is connected to a chimney that was origi-
nallysizedand designed for anopenfireplace.Closed
heaters require smaller flues.
n The chimney is too short.
There is a better draft in a tall chimney than in a
Chimney Performance
The most important part of a woodburning system
is the chimney, and to work properly it must safely
exhaust the product of combustion and at the same
time draw enough oxygen into the appliance to main-
tain combustion.
Chimneys operate on the simple principle that
warmairrisesbecauseithasalowerdensity than cold
air. Warmer flue gases in the chimney create a pres-
suredifferencecalleddraftandtherising gases create
a partial vacuum at the bottom of the chimney and at
the appliance.
What's known as "draft problems" are actually
chimneyperformanceproblemsandareseldomcaused
by inadequate draft. They are more often caused by
poor design and operational problems caused by the
chimney itself.
There are two major factors to consider when
working with chimneys: draft and flue gas volume (or
flow). Draft is the force which causes the gases to be
exhausted.Thefluegasvolumeistheamountofgases
which pass through the system as a result of the draft.
Thesizingofachimneyshouldbebasedontheflow
requirement,asanychimneysizehasacertaincapac-
ity in regards to the appliance it is serving.
Two major factors influence the chimney capacity:
draftandflowresistance.Flowresistance isaresultof
friction, and always exists between the moving gases
and the flue through which they flow. Even straight
walls represent flow resistance, but of course bends,
turns, shape of the flue etc. are more restrictive.
For a system to work properly, the draft MUST
exceed the flow resistance. Otherwise the flow is
reversed in the system.
Chimney Performance Problems
Theprinciples forflowand draft applyto all heating
appliances,buttherearesomedifferencestobeaware
of. Open heaters (open fireplaces, BBQ's) require a
large chimney capacity, as they exhaust a relatively
large volume of flue gases, because of the speed at
which the combustion takes place. As a result, they
alsodrawplentyofroomair,whichlowerstheaverage
flue gas temperature, which lowers the average chim-
ney temperature, which again reduces the draft.
Closed heaters (stoves, fireplace inserts, ovens,
etc.)burnmoreslowly,andthusproducelessexhaust.
The flow of air for combustion is restricted by the
3
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chimney.
This phenomena can cause what is called the
"Cold-Backdraft-at-Standby"Syndrome.Thenegative
pressure created by the stack effect will cause a
fireplace or wood stove in a basement to backdraft, so
it can be difficual, if not impossible, to start a fire. If the
chimney is located on an outside wall and subject to
cooling effects, it is most likely not possible to use the
fireplaces.
n Downdraft/Backdraft.
Downdraft is one of the most common problems,
and often a periodical problem.
In most cases, the backdraft is caused by tall trees
orbuildingsclosetothechimney.Thisinfluenceswind
directions and pressures surrounding the building and
can give “back puffs” in the chimney. On some
occassions a chimney can have perfect draft for years
and then suddenly after f.inst. 10 years, surrounding
treeshavegrownand reachedaheightthataffectsthe
chimney draft.
Itcouldalsobethelocationofthehousethatcauses
theproblem.Ahouseinavalleyoronahillismorelikely
to have downdrafting problems. The wind can be very
turbulent in these locations and often cause a down-
ward pressure in the chimney.
The height of the chimney can often be blamed for
the downdraft. Even if the chimney meets minimum
heightrequirementsinregardstoheightabovetheroof
line, it could still be too short to avoid the effects of the
turbulence.
short chimney. Chimney height and the temperature
differencebetweenthe averagefluegastemperature
ofthe outside air arethemajorfactors influencing the
amount of draft.
Arule of thumb forminimumheightstates that the
total system height (from the floor the appliance is
mountedontothetopofthechimney)shouldneverbe
less than 15 feet.
nThe chimney is too high.
Increasing the height of a chimney increases the
draft. Realistically, draft does not increase in direct
proportion to the increased height. At some point,
additional height gives the flue gases more time to
transfer heat to the flue walls and cool off. This will
cause a reduction in the available draft.
If a system meets the recommended minimum
chimney height and draft problems are experienced,
it may have no or little effect to extend the chimney.
Combined with a flue that is too small, additional
chimney height can create extreme problems, that
can only be solved mechanically.
n The chimney is installed on an outside wall.
If one or more sides of the chimney is part of an
external wall, the chimney is exposed to the outside
cold.This chilling effect willreducetheavailable draft
of the chimney, and it can be so bad that the exhaust
gas is not able to create any draft at all. This is
especially true if the chimney is not insulated.
n Stack effects
During cold weather, a house can create exactly
the same "draft" effect as a chimney. The taller the
house, the more stack effect.
Two- or three storey houses and buildings can
producequiteasubstantial"draft" that can overcome
the chimney draft and cause reversed flow in the
EXHAUSTO
4
Fig. 1
Fig. 2
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n Bad fireplace design
Not only the chimney, but also the fireplace, stove
or other appliances may cause smoke to be omitted
into the room. Here are some typical problems:
The fireplace opening may be oversized for the
chimney. Normally the area of the opening should not
exceed 10-12 times the flue area.
Thelintelcouldbetoowide.Thewidthshouldnotbe
greater than 4".
The smoke chamber could be too short. It should
not be less than 18" high. Or it could be asymmetrical
with a flue that is not centered.
Excessiveprojectionsfromthedamper,sharpangles
in the masonry or anything else working against an
aerodynamic smoke chamber or throat design.
Amongcriticalfireplacesarethesocalled“Walk-In”
fireplaces (very big fireplaces), and free-standing fire-
placesopenonallsides.Thesefireplacesmustcapture
the air in the same way as an exhaust hood, which
requires a really good draft in order to maintain a high
velocity over the fireplace opening.
Finally, there is the see-through fireplace, that is
open on two sides. A high percentage of this type of
fireplace have draft problems, and problems with tur-
bulence in the firebox. Very often this is caused by a
flue that is too small, a bad aerodynamic design of the
smoke chamber, the non-existence of same - or, a
combination of all.
Most problems are created when a regular one-
sided fireplace is converted into a see-through fire-
place by knocking the back-wall out and design an
opening.
n Modern insulation of dwelling
When houses are efficiently insulated there is usu-
ally not sufficient air for combustion. Very often make-
up air vents do not exist resulting in air starvation, and
under these conditions there simply is no draft avail-
able.
Air starvation can only be overcome by induced
draft, but at the same time it should be considered to
installmake-upairvents.Otherappliancesusingairfor
the combustion, like fireplaces, furnaces, water heat-
ers etc. can also cause smoking fireplaces.
n Ventilation
Modern buildings have an in-creasing number of
exhaustfanspullingairoutofthebuilding.Theycanbe
found in kitchens and bath-rooms, but also central
vacuum-cleaners, dryers and more can pull air out.
Thebuildingswillsoonbeoperatinginadepressur-
ized mode - the positive pressure is outside and the
negative inside the building. The result is that outside
air is pulled into the building through openings and
cracks, and the chimney is very often the best vent!
The situation is aggrevated in restaurant kitchens.
Woodfiredappliances,likefireplaces,BBQ'sandpizza
ovens, can be severely affected by kitchen exhaust
fans, even when these are well balanced.
EXHAUSTO
Fig. 4
Fig. 3
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Uses for the chimney fan.
TheEXHAUSTOChimneyFanisdesignedtocope
with the majority of draft problems, whether these are
relatedtothechimneydesign,thefireplacedesign,the
building design or weather and wind.
The EXHAUSTO chimney Fan can be installed on
brick chimneys - lined or un-lined - as well as steel
chimneys, whether single, double or triple walls or
insulated.
Whilethechimneyfanwillmakemostsystemswork
and solve draft and smoke problems, it must be
emphasized that the chimney fan does not correct a
problem. For example, it will not "repair" a crack
(cracks should always be repaired) in the flue tile, or
enlarge an under-sized flue.
Whatthechimneyfanisdoingismakingimpossible
situations possible. To use above examples, it will
assure air is pulled into the flue instead of flue gases
goingout through the cracks,andit will enable theuse
of an undersized flue by creating mechanical draft to
overcome the resistance.
Typical Applications.
These are typical applications where chimney fans
could be used:
n Chimney is too low.
The chimney fan will make up for the insufficient
draft which is a result of a chimney that is too short.
nChimney is too high.
The chimney fan will create the necessary draft
causedbyinsufficientflue gastemperature(lessdraft)
or excessive height (increased resistance).
n Flue is too small.
The chimney fan will create additional draft to
overcometheaddedrestrictioncausedbyafluethatis
too small.
n Flue has been relined.
Itiscomparabletothesituationwheretheflueistoo
small.
n The flue is too large.
The chimney fan will create additional flow in the
chimneytomakeup fortheinsufficientdraftcausedby
insufficient flue gas temperature.
EXHAUSTO
6
SECTION 2: APPLICATIONS FOR THE CHIMNEY FAN
n Stack effects.
Due to the existence of mechanical draft, the re-
versedraft/flowinthechimneyisprevented.Evencold
starts will now be possible.
n Downdraft/backdraft situations.
These problems are normally caused by the loca-
tion of the building and chimney, trees around the
buildingetc.Thechimneyfanwillpreventtheproblems
to occur because the draft it can create, is a lot more
powerfulthanthenaturaldraft.Sincethefanisinstalled
on the top of the chimney, the fan also prevents
backdraft caused by eddies (turbulence).
n Depressurization.
In most cases, the chimney fan can easily over-
come the negative pressure in a building that causes
the fireplace to backdraft. It is important to remember,
however,tomakesurethatafurnaceorawaterheater
installed in the same building, still works properly after
thechimneyfanisinstalled.Installationofspillswitches
on these appliances is highly recommended.
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EXHAUSTO
SECTION 3:TECHNICAL DATA & SPECIFICATIONS
RS 12
1.2
80
37
14
11
14
4
11
Model
Discharge
Type
RPM
Voltage
Amps
Watts (output)
Weight (lbs)
A (in)
B (in)
C (in)
D (in)
E (in)
RS 16
3.9
250
61
19
16
18
4
14
RS 14
1.4
100
47
16
13
16
4
12
RS 9
0.5
25
29
12
10
11
3
8
Axial Vane
1 x 120V
Horizontal
1600
Dimensions & Electrical Data
Technical Description
TheEXHAUSTOchimneyfanisaspecialdesigned
high temperature fan with horizontal discharge. It is
ETL-listed (UL Standard 378 for Draft Equipment).
The chimney fan is mounted on the top of the
chimney and creates a negative pressure in the entire
chimney or stack. This eliminates the risk of chimney
spillagewith dangerousgases,likecarbon monoxide.
Further the fan reduces the creosote build-up dra-
matically and ensures an optimal combustion in fire-
places, stoves, inserts, boilers, furnaces, water heat-
ers, etc.
Thefan is madeof cast aluminumandis extremely
resistant to corrosion. The chimney fan is equipped
with axial vanes made of stainless steel, and can
withstand exhaust gases and warm air up to max.
650°F(max.300°C.).Thedesignofthevanesassures
a minimum soot or creosote built-up on the fan base.
The top of the chimney fan is hinged to the base,
which eases service and cleaning of the chimney.
The motor is a split-capacitor type constructed by
EXHAUSTO to withstand high flue gas temperatures.
It has thermal overload protection and is virtually
maintenancefree with pre-lubricated sealedballbear-
ing.The motor is completely enclosed and protected
from rain, water, snow, soot, dust etc. It is balanced to
assure a very low noise level and vibration-free use.
The chimney fan as an obstruction.
Installedonthechimneyfluetermination,thechim-
ney fan could be considered a restriction to the flow.
However, the design of the fan assures a relatively
low restriction and lower than most chimney caps!
As a safety-listed product, the chimney fan has
been tested to a resistance factor (k-value) of 0.5,
which is comparable to a 45° elbow.
Any type of chimney cap is definitely a restriction,
but some more than others. Non-listed chimney caps
add the most resistance to the chimney flue. As the
inlet is generally the same size as the flue, the resis-
tancefactor(k-value)could easily exceed that ofa90°
elbow.
A UL-listed low resistance chimney cap is usually
rated at a resistance factor of 0.5, but they are also
aerodynamically designed to safely convey the flue
gases.
The EXHAUSTO chimney fan is only a minor
resistancetothechimneyflue(lessthanmostchimney
caps) provided the fan size is selected properly.
However,afireplacethathadsmokeproblemsprior
to the installation of an EXHAUSTO chimney fan, will
still have smoke problems if the fan is not operating.
Fig. 5
7
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8
EXHAUSTO
Capacity Charts
Model RS 9 - RS 16
200 600 1000 1400 1800 2200Q (cfm)
1.0
.8
.6
.4
.2
0
RS 16
RS 14
RS 12
RS 9
Ps(in WC)
t = 68°F
Density = 0.075 lbs/cu.ft.
Ps = Static Pressure
n = 1600 RPM
The models were tested on the
following duct sizes:
RS 9 8"
RS 12 10"
RS 14 12"
RS 16 16"
Model
RS 9
RS 12
RS 14
RS 16
125 Hz
54
64
75
81
250 Hz
50
60
69
76
500 Hz
47
55
65
72
1000 Hz
43
52
62
69
2000 Hz
38
48
57
64
4000 Hz
31
42
51
58
8000 Hz
25
34
44
52
Lp
dB(A)
21
30
41
47
Lw dB
Tolerance +/- 3 dB
Lw = Sound Power Level dB
Lp = Sound Pressure Level dB(A) in 10 meter/
30 feet distance from the fan.
Note:A sound power level of 30 dB is
comparable to a voice - very soft whisper.
70 dB is comparable to a voice - conversa-
tionallevel.
Sound Diagram
Lp (5 meter/15 feet) = Lp (10 meter/30 feet) + 6 dB
Lp (20 meter/60 feet) = Lp (10 meter/30 feet) - 6 dB
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Two-sided (See-through):
Multiplytheheight"B"bythewidth"A"tofindtheare
oftheopeningononeside.Add50%(multiplythearea
by 1.5) and use this adjusted area to find the appropri-
ate column.
Three-sided (corner installation):
To determine the area of a three-sided fireplace,
find the length of diagonals, "A" and "B". Add "A" and
"B" and multiply the sum by "C" (all measures in
inches ).
There are two ways to determine the chimney fan
type and size for a specific application.
One alternative is to calculate the flue gas volume
and the flow resistance and then select a chimney fan
that meets the calculated requirements. This is nor-
mally referred to as an "engineered system". For
directions on how to do a manual calculation, please
refer to Appendix A.
However, most applications are relatively simple
andarecoveredbytheselectionchartsonpage11and
12.The selection charts are based on the following
assumptions:
Height of chimney: 15-30 ft.
Flue gas temperature (fuel):
Wood: 300°F
Natural Gas: 200°F
Frontal inlet velocity:
Fireplaces (wood) 48 FPM
Fireplaces (gas) 36 FPM
See-through (wood) 72 FPM
See-through (gas) 54 FPM
Free-standing 96 FPM
Stoves 72 FPM
Pizza ovens 84 FPM
Fireplaces
Thefirst step is to determine the area of fireplace
opening. Follow these directions:
One-sided:
Determinethefireplaceopeningareabymultiplying
width "A" and height "B" (all measures in inches ).
EXHAUSTO
SECTION 4: HOW TOSELECT CHIMNEY FAN
B
A
A
B
C
A
B
Fig.6
Fig.7
Fig.8
9
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Free-standing (open all around)
Measure the width "A" and the depth "B" of the
hood. Multiply "A" and "B" and add 50% (multiply the
area by 1.5).
If the free-standing fireplace is round, measure the
diameter, D, and calculate the area by using this
formula:Area = D x D x .7854
and add 50% (multiply the area by 1.5).
Thesecondstepistodeterminethesizeoftheflue
opening. If the flue is rectangular, refer to Appendix C
on how to convert a rectangular flue to a round flue.
The third step is to make sure there are no more
than two 90° bends, and the chimney height is min. 10
feet and does not exceed 30 feet. If you exceed these
limits, you may need to use a stronger fan.
The fourth step is to cross reference the opening
andthefluesizeinordertodeterminewhichsizefanto
use.
Stoves and fireplace inserts
Determine the are of the door opening by multiply-
ing "A" and "B". The chart on page 12 shows the size
EXHAUSTO
10
fan to use.
Wood-fired Pizza Ovens
Determinetheareaofthedooropeningbymultiply-
ing the measures "A" and "B"and the flue size (all
measures in inches) . Cross reference this information
for selection of the appropriate chimney fan. The fan
selection is based on max. 1/10"W.C. negative room
pressure.
If the application experiences more than the al-
lowed negative pressure, even if it is only temporary,
select one size larger chimney fan.
Other Applications
If you need a chimney fan for an application that is
not covered by the charts or if you are not sure about
what’s needed for your applications, please contact
EXHAUSTO at 1-800-255-2923, and we will be happy
to assist you dimensioning the chimney fan.
B
A
Fig. 11
A
B
AB
Fig. 9
Fig. 10
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EXHAUSTO
Fan Selection Tables for Fireplaces
Fireplace Opening (sq.in.)
Max.
500 Max. 800 Max. 1,200 Max 1,900 Max. 2,500 Max. 3,500 Max. 5,000 Max. 6,000
RS 9 RS 14 ******
RS 9 RS 12 RS 16 *****
RS 9 RS 12 RS 14 RS 16 ****
RS9 RS 9 RS 12 RS 14 RS 16 RS 16 RS 16 *
RS 9 RS 9 RS 12 RS 14 RS 16 RS 16 RS 16 *
RS 12 RS 12 RS 12 RS 12 RS 16 RS 16 RS 16 *
RS 12 RS 12 RS 12 RS 12 RS 16 RS 16 RS 16 *
RS 12 RS 12 RS 12 RS 12 RS 16 RS 16 RS 16 *
RS 12 RS 12 RS 12 RS 12 RS 16 RS 16 RS 16 *
RS 12 RS 12 RS 12 RS 12 RS 16 RS 16 RS 16 *
6
7
8
10
12
14
16
18
20
22
Fireplaces
(wood-fired)
Flue
Size
6
7
8
10
12
14
16
18
20
22
Fireplaces
(gas-fired)
Fireplace Opening (sq.in.)
Max.
500 Max. 800 Max. 1,200 Max 1,900 Max. 2,500 Max. 3,500 Max. 5,000 Max. 6,000
RS 9 RS 12 RS 14 *****
RS 9 RS 12 RS 14 *****
RS 9 RS 9 RS 12 RS 16 * * * *
RS9 RS 9 RS 12 RS 12 RS 14 RS 16 RS 16 *
RS 9 RS 9 RS 12 RS 12 RS 14 RS 16 RS 16 *
RS 12 RS 12 RS 12 RS 12 RS 14 RS 16 RS 16 *
RS 12 RS 12 RS 12 RS 12 RS 14 RS 16 RS 16 *
RS 12 RS 12 RS 12 RS 12 RS 14 RS 16 RS 16 *
RS 12 RS 12 RS 12 RS 12 RS 14 RS 16 RS 16 *
RS 12 RS 12 RS 12 RS 12 RS 14 RS 16 RS 16 *
Flue
Size
NB. If your flue
size is not found in
thefluesizecolumn,
alwaysuse the clos-
est flue size with the
largest fan.
Example. Your
openingis750sqinand
your flue size is 9". An
8" inch flue requires a
model RS12, while a
10" flue requires a
model RS 9. For a 9"
flue, use a model
RS12.
11
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12
Fan Selection Tables for Stoves and
Fireplace Inserts
Door Opening (sq.in.)
Max. 300 Max. 300 Max. 300
RS 9 RS 9 RS 9
RS 9 RS 9 RS 9
RS 9 RS 9 RS 12
RS 9 RS 9 RS 12
RS 9 RS 9 RS 12
RS 12 RS 12 RS 14
Flue
Size Fireplace
Inserts Pizza Ovens *)
*) For the sizing in conjunction with a wood-fired pizza oven a
negativepressureof1/10"W.C.hasbeentakenintoconsiderationas
most of these ovens are used in kitchens with exhaust fans.
6
7
8
9
10
12
Stoves
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Installation of the Chimney Fan
Theinstallationofthechimneyfanisestimatedto
take an average of 15 minutes, when installed on a
brickchimney or asteelchimney. The installationtime
doesnotinclude:settingupladder,lifting fan tothetop
of the chimney, cutting back flue tile etc. Only the
installationoffibermat,mountingbrackets,steelchim-
ney adaptor, safety wire, and junction box is included.
Open the carton and remove all packing materi-
als. The standard chimney fan package includes:
chimney fan w. bird screen, 3-4 ft cable in conduit,
weatherproof junction box (not shown), fiber mat,
safetywirewithanchor,Installationbrackets (setof4),
motor speed control (not shown), Installation Instruc-
tions and a Warranty Registration Card.
Make sure the axial vane turns without making
noise or offering resistance. Also make sure it is in
balance.
Installation on brick chimney.
The installation procedure is the same whether
the flue is round or rectangular.
If a clay tile flue liner is installed, it might stick up
a few inches. Cut it back so it is flush with the chimney
crown.
Step1:
Measuretheinsideoftheflueandcutamatching
hole in the fiber mat. Leave a minimum distance of
EXHAUSTO
SECTION 5: INSTALLATION INSTRUCTIONS
3/4" to any side of the fiber mat.
The aluminum foil on the fiber mat must face up
against the fan base.
Step 2:
Locatetheinstallationbracketsinthegrooveson
the underside of the fan base using the bolts and nuts
supplied, to secure the brackets. Note that the bolts
shall be installed from the bottom side in the two inner
holes.
Adjust the final position of the installation brack-
etsensuringthatthereisclearancebetweenthebrack-
ets and the flue wall.
If the brackets touch the flue wall, it is likely to
create some noise from the vibration.
Step 3:
The chimney fan is now ready for installation on
the top of the chimney. Place the fiber mat on the top
ofthechimney,withthealuminumfacingupwards,and
place the fan on the top of the mat.
400°F
Fig. 12
Fig. 13
Fig. 14
Nuts
Mounting
Brackets
Bolts
Groove
FiberMat
Chimney Fan
Mounting Brackets
Fiber Mat
13
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EXHAUSTO
14
Step 4:
Decide on the location of the bolt and wall plug
(1). Drill a hole in the stack and secure the safety wire
by the bolt and the wall plug. Take the safety wire
throughtheholeinthefanbaseandreturnittothefree
clamp of the wire.
Tighten the safety wire slightly (2) and crimp the
freeclamptoprovidesecureanchoringforsubsequent
safe cleaning and service.
Fit the liquid tight junction box (3) on the outside
wallofthechimneystack,butmake sure the conduit is
10-12" away from the fan outlet. Run the installation
cable to the fan speed control/switch and the main
electricsupply.SeeSection6:Wiringthechimney fan.
Installation on Steel Chimneys.
Installation on a steel chimney follows the same
procedure as for masonry chimneys, except that a
steel chimney adaptor FRS is required.
The adaptor (optional) fits standard flue dimen-
sions or as required. The collar slides into the flue
where the long engagement ensures safe anchoring.
Theremainingpartoftheinstallationfollowsstep
3 through step 6.
Special Applications.
1. High temperature applications.
If the fan is used for applications where the flue
gas temperature exceeds 400°F at the exit point, but
does not exceed 650°F, dilution bolts must be used.
Typicalsituationsarechimneysthatareonly6-8'high.
Dilution bolts will cause cool air to mix with the
warm exhaust gas as they will lift the fan from the
chimney and leave space so the cool air can get in.
The dilution bolts should be installed in the outer
holes in the fan base.
Thedilutionboltsshouldbeadjustedinheight,so
thefluegastemperaturedoesnot exceed400°Fwhen
discharged through the fan. However, in order to
minimizesoot deposits make surethetemperatures is
above 320°F.
When using dilution bolts the fan’s actual capac-
ity decreases and you might need a stronger model.
Fiber mat is not required when using dilution bolts.
Fig. 15
Fig. 17
Fig. 16
ChimneyFan
Brackets
FiberMat
ChimneyFan
Brackets
FiberMat
FRS,steel
chimneyadaptor
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EXHAUSTO
2. The Flue is Bigger than the Fan Base.
If the flue size exceeds the size of the fan base,
it is necessary to alter the top of the chimney by
installingasupportflange, made out of stainlesssteel,
as shown below.
Thesupportflangemustbesecuredandthehole
in the center must be 12" in diameter.
3. The Flue Pipe is Higher than the Chimney.
In many cases, the chimney is designed so the
linerorthechimneyinsertsticksseveralinchesupover
thechimneytop.Ifitisa few inches,it’srecommended
to install the chimney fan on the top, provided the pipe
will give enough support for the fan.
If there’s insufficient support, the liner or the flue
must be cut back, so it is flush with the top of the
chimney and the chimney fan can be installed as
described in the previous.
4. Two Flues Servicing One Fireplace
Thissolutionisusedbymanydesignerswhenthe
fireplace opening is large, and the total flue opening
must be larger than a standard pipe or liner.
By installing two separate flues the builder has
accomplished a total flue opening big enough for the
fireplace opening.
When sizing a chimney fan for this kind of appli-
cation, there are two ways to go about it:
One of the flues must be shut off or disconnected
and the chimney fan installed on the open flue, or
A chimney fan should be installed on each flue
and operate in tandem.
Note: Using only one flue can cause problems
with flow noise due to high velocities. Chimney fans
operatingintandemshouldalwaysbeofthesamesize.
Call EXHAUSTO for sizing recommendation.
Fig. 18
Fig. 19
Dilutionbolts
15
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16 EXHAUSTO
SECTION 6:WIRING OF THE CHIMNEY FAN
All electrical wiring must be in accordance with
requirements of the authority having jurisdiction or, in
absenceof such requirements,withtheNational Elec-
trical Code NFPA 70 - latest edition.
Powerrequirementsforthechimneyfandepends
on the size in use. Electrical requirements are:
RS 9 1 x 120V/60 Cycles/0.4 Amps
RS 12 1 x 120V/60 Cycles/1.2 Amps
RS 14 1 x 120V/60 Cycles/1.4 Amps
RS 16 1 x 120V/60 Cycles/3.9 Amps
We recommend that wiring of the chimney fan is
performed by a certified electrician.
Materials needed for solid fuel
applications.
The chimney fan is equipped with about 4 feet of
high-temperature conduit that terminates in a pre-
wired, liquid-tight junction box. Further, a motor speed
control is provided for installation in a regular 2x4 wall
box. The junction box should be mounted on the side
of the chimney
The wire mostly used to power the fan, is a 2x14
AWG wire with ground. If the chimney is a steel
chimney (single,double or triple wall) or a solid brick
chimney with a liner, the wire must be run outside the
chimney in a liquid-tight conduit (if required by local
codes).
If the chimney is just a chase surrounding the
actual steel chimney, the wiring can be run inside the
chase, but always outside the steel chimney.
Materials needed for non-solid fuel
applications.
In addition to the materials needed for solid-fuel
applications, non-solid fuel applications (gas) should
incorporate a fan proving switch.
Connection diagram.
Due to the heat generated from the flue, the
motor run capacitor is located in the junction box. The
result is a wiring configuration that may seem a little
unusual.
Four wire leads are coming out of the motor and
goingtothejunctionbox.Twowireleadsand a ground
lead is assumed going to the junction box from the
power supply.
Fig. 20
Fig. 21
ToPowerSupply
Capacitor
Red
Black
Black
Green
White
White
ToFan
ChimneyFan
JunctionBox
Wallbox MotorSpeedControl
CoverPlate
The connections are shown in figure 20:
The diagram below shows the connections for
the entire system.
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FanMotor
(Thermally
protected)
Motorspeed
control
120 volt, single phase, 60 Hz,
Power Supply
M
two sheet metal screws. Run a 1/4" tube (copper or
aluminum) from the switch and insert the into the side
of the chimney through the mounting bracket.
For the switch, select a location where the tem-
perature is within the limits of the switch. Mount the
switch in a vertical position and follow the adjustment
directions later in this Section.
Sequence of operation:
1. The chimney fan is turned ON prior to starting
the gas-fired heating appliance.
2. Operation will close the pressure switch and
activate(open)theSolenoidGasValvelocated
betweenthegas-tank/maingassupplyandthe
burner.
3. The fan speed, and thereby the draft, is
controlled manually by adjustments made
to the motor speed control.
4. Anyinterruptionofthedraftcausingthedraftto
fall below the pressure switch setting will open
the pressure switch and de-activate the Sole-
noid Gas Valve.
Chimney
Section
Fig. 24
FanProvingSwitch
Low Pressure Port
Fig. 23
Probe
Wiring Diagram for chimney fan
controlled by motor speed control.
This is wiring diagram for the fan.
Sequence of operation:
1. The chimney fan is turned ON prior to
starting heating appliance.
2. The fan speed, and thereby the draft, is
controlled manually by adjustments made
to the motor speed control.
3. When the fire in the heating appliance has
died out, the fan can be turned OFF.
Wiring diagram for chimney fan
controlled by motor speed control and
fan proving switch.
For applications using natural gas or LP gas as
fuel, a fan proving switch should be used.
The wiring of the system is shown below, but
attention must be paid to the installation and location
of the probe connected to the fan proving switch.
For the probe (fig. 23), drill a hole in the side of
thechimney,attachthemountingplateoverit withthe
EXHAUSTO
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Adjusting the Fan Proving Switch
setting.
Before any adjustments are made, turn ON the
chimney fan and make sure it is operating.
Turn the fan OFF and make sure the pressure
switch opens, so the power to the circuit, it controls, is
disconnected.
Start the gas-fireplace. Use the motor speed
control to set the speed of the chimney fan, so no
spillage (back pressure) is experienced. Mark this
setting on the motor speed control cover.
Remove the snap cover from the conduit enclo-
sure by loosening its retaining screws. Turn the slotted
adjustment screw clockwise to raise the set point and
counter clockwise to lower the set point.
Set the adjustment screw to its lowest position.
With the gas-fireplace/gas logs operating, reduce the
speed of the chimney fan to the point where the
fireplacestartstospillgasorfluegasfromthetopofthe
opening. Increase the speed gradually to the point
where there is no more spillage. Raise the switch's set
point so it just opens. Return the fan speed to the
original setting marked on the cover.
18
EXHAUSTO
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EXHAUSTO
SECTION 7: CLEANING & MAINTENANCE
How to start a fire.
Fireplaces
Follow instructions on how to build and maintain
a good fire.
Prior to starting the fire, set the fan at full speed
and light the fire. When the flames from the kindling
load just begin to subside, add several small pieces of
firewood.Whenthefirewoodhascaughtfire,after5-15
minutes,thespeedshouldbereducedtoalevelwhere
a perfect flame/combustion is achieved.
When adding wood to the fire, it may be neces-
sary to increase the speed for a while.
Also, if there are smoke problems they are most
likelytoincurwhenthe fireisabouttodieout,soat this
point,itmaybenecessarytoincreasethespeedagain.
Thisprocedurewillhelpconservingenergyandat
the same time assure a maximum heating output from
the fireplace.
Stoves.
When starting a fire in a stove, follow the same
procedures as for a fireplace, except that the air
adjustment device must be completely open during
start up.
Cleaning Intervals
There is no simple rule in regards to cleaning a
chimney and a chimney fan, except that when the
chimney needs cleaning, so does the chimney fan.
Itisrecommendedthatthechimney,thefluepipe
andtheEXHAUSTOchimneyfanis checkedregularly
until a rate of creosote build-up has been determined.
Clean when deposits have built up to more than 1/8".
The amount of build-up is directly related to the
use of the heating appliance and to the type of fuel
being used. In general, gas fired systems do not
require cleaning as often as woodfired systems.
Most modern residential systems work so effi-
ciently that cleaning is only required once a year.
Commercial systems (fireplaces in restaurants, hotel
lobbies, restaurant pizza ovens) require cleaning with
shorter intervals.
Cleaning the chimney fan
The EXHAUSTO chimney fan is designed for
prolonged use. The fan should be inspected at least
onceayearwhenthechimneyisinspected.Thereisno
need for lubrication as the fan is maintenance-free.
Soot, tar and other deposits should be removed
from the fan blades and the bottom of the motor
housing.
Thetopofthefanishingedandcanbeopenedin
order to ease the cleaning.
DO NOT OPEN THE MOTOR HOUSING UN-
LESS THE POWER HAS BEEN SWITCHED OFF.
Useasimpletool,likeascrewdriverforremoving
the deposits. Make sure to fasten the security screw
after cleaning.
Fig. 20
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