Venmar Duo 1.4 User guide

03309-04/10/08
Installer Manual
Ventilation Systems for residential use only
Duo 1.2 (part #: 43710)
Duo 1.4 (part #: 43700)
Duo 1.9 (part #: 45700)
Solo 1.5 (part #: 43720 and 43725)
Solo 2.0 (part #: 45720 and 45725)
VB0013
VB0012

2
Table of Contents
1.0 SERVICE ............................................................................................4
1.1 3-D Drawing ................................................................................4
1.2 Parts Ordering Chart....................................................................5
1.3 Technical Support ........................................................................5
2.0 SIZING ................................................................................................6
3.0 UNIT TYPE & DEFROST SETTING VS GEOGRAPHICAL LOCATION ..7
4.0 TECHNICAL DATA................................................................................8
4.1 Air Distribution (Normal Operation)..............................................8
4.2 Air Distribution (Defrost and/or Filtration Mode) ..........................8
4.3 Performance Charts ................................................................9-11
4.4 Dimensions ................................................................................12
4.5 Controls and Link Options..........................................................12
4.6 Specifications ............................................................................12
5.0 TYPICAL INSTALLATIONS ..................................................................13
5.1 Fully Ducted System ..................................................................13
5.2 Exhaust Ducted System
(Source Point Ventilation) ..................13
5.3 Simplified
(Volume Ventilation) ..................................................13
6.0 INSTALLATION....................................................................................14
6.1 Locating and Mounting the Unit ................................................14
6.2 Planning of the Ductwork ..........................................................14
6.3 Calculating the Duct Size ..........................................................15
6.3.1 Example Calculation ........................................................15
6.3.2 Example of a Design for a Fully Ducted System ............15
6.4 Installing the Ductwork and Registers ......................................16
6.4.1 Fully Ducted System........................................................16
6.4.2 Exhaust Ducted System (Source Point Ventilation) ........16
6.4.3 Simplified Installation (Volume Ventilation) ......................17
6.5 Connecting the Duct to the Unit ................................................18
6.6 Installing the Exterior Hoods ......................................................19
6.7 Connecting the Drain (Solo only) ..............................................20
7.0 CONTROL DEVICES ..........................................................................21
7.1 Main Controls ............................................................................21
7.2 Optional Controls ......................................................................21
7.3 Other Features ..........................................................................22

3
Table of Contents (cont’d)
About this Manual
8.0 INSTALLATION OF THE CONTROLS ..................................................22
8.1 Dimensions and Specifications ................................................22
8.2 Installation of the Main Control ..........................................22-23
8.3 Installation of the Wireless Push button and Receiver ............24
8.4 Electrical Connection to Optional Controls ..............................25
8.5 Electrical Connection to the Furnace ......................................25
9.0 WIRING DIAGRAMS ....................................................................26-27
10.0 AIR FLOW BALANCING ................................................................28
11.0 OVERALL VERIFICATION ..................................................................29
11.1 Main Controls ..........................................................................29
11.2 Optional Controls ....................................................................30
12.0 MAINTENANCE / INSTRUCTIONS FOR USER....................................30
13.0 TROUBLESHOOTING ....................................................................31-32
14.0 REFERENCES....................................................................................32
This manual uses the following symbols to emphasize particular information:
NOTE: Indicates supplementary information needed to fully complete an instruction.
WARNING
Identifies an instruction which, if not followed, might cause serious personal injuries including
possibility of death.
!
CAUTION
Denotes an instruction which, if not followed, may severely damage the unit and/or
its components.

4
1.1 3-D DRAWING
1.0 Service
20
0
24
4
23
3
25
25
2
22
22
17
1
4
7
5
8
6
18
1
8
19
1
8
18
21
9
10
1
3
3
1
1
12
1
13
1
1
5
14
17
16
1
VL0007
Unit shown in normal position.

5
1.2 PARTS ORDERING CHART
1.0 Service (cont’d)
TO ORDER PARTS: Contact your local distributor.
No Description SOLO 1.5 SOLO 2.0 DUO 1.2 DUO 1.4 DUO 1.9
(A) 43720 (A) 45720 43710 43700 45700
(B) 43725 (B) 45725
1 Double Collar Port #2 02257 02257 02257 02257 02257
2 Damper #1 (kit) 12454 12454 12454 12454 12454
3 Damper Rod (kit) 13037 13037 13037 13037 13037
4 Electronic Board & spacers (kit) 13038 13038 13039 13039 13039
5 Thermistor (kit) 12895 12895 12895 12895 12895
6 Door Latches & screws 00886 (2) 00886 (2) 00886 (2) 00886 (2) 00886 (2)
00601 (4) 00601 (4) 00601 (4) 00601 (4) 00601 (4)
7 Damper Actuator Assembly 13734 13734 13734 13734 13734
8 Basic Filter 03308 03308 03308 03308 03308
9 Blower Assembly 12908 12912 12909 12909 12911
10 Square Damper (kit) 13033 13033 13033 13033 13033
11 Top Wheel 02238 02238 02238 02239 02239
12 Motor 12109 12157 12109 12109 12157
13 Bottom Wheel 02240 02240 02239 02239 02240
14 Door Ass’y (including 15 to 17) 13346 13346 13346 13346 13346
15 Door Latches (keeper) 00887 (2) 00887 (2) 00887 (2) 00887 (2) 00887 (2)
& Screws 00601 (4) 00601 (4) 00601 (4) 00601 (4) 00601 (4)
16 Label 03328 03328 03328 03328 03328
17 Hinge Ass’y (kit) 13036 13036 13036 13036 13036
18 Pleated Optional Filter 03316 03316 03316 03316 03316
Charcoal Optional Filter 03315 03315 03315 03315 03315
Electronic Optional Filter 03314 03314 03314 03314 03314
19 Thermal Wheel N/A N/A 13045 13044 13045
20 Recovery Core (A) 03322 (A) 03322 N/A N/A N/A
(B) 03311 (B) 03311
21 Balancing Double Collar Port 02256 02256 02256 02256 02256
22 Balancing Damper 02253 02253 02253 02253 02253
23 Snap Bushing DP-750 03324 (2) 03324 (2) 03324 (2) 03324 (2) 03324 (2)
& O-Ring 03310 (4) 03310 (4) 03310 (4) 03310 (4) 03310 (4)
24 Drain Connector (kit) 03203 03203 N/A N/A N/A
25 Door Switch (SPST), E69 10A 01825 01825 01825 01825 01825
Please take note that parts not listed are not available; those parts require assembly knowledge that only manufacturer
can guarantee.
For assistance, call on weekdays, 8:30 AM to 5:00 PM (Eastern Standard Time).
NOTE: Do not call this number for ordering parts.
Canada & USA: 1-800-649-0372 (toll free)
1.3 TECHNICAL SUPPORT (FOR ASSISTANCE)

6
These are the two most common methods used to evaluate the ventilation needs of a house:
CSA F326 and Canadian Building Code:
• High speed: 10 cfm per room
20 cfm for the master bedroom and the basement
• Low speed: 40-60% of high speed
ASHRAE Standard 62-2001:
• 0.35 air change per hour
Refer to ventilation code of your area to determine which method to use.
Example:
2.0 Sizing
Master
Bedroom
Bedroom #1
Kitchen
Basement
Bedroom
#2
Bedroom
#3
Living room
Bathroom
#3
Dining room
VH0021A
Family room
Bathroom
#1
Bathroom
#2
Laundry
room
1320 ft2
1320 ft2
CSA F326
Kitchen (10 cfm)
Dining room (10 cfm)
Living room (10 cfm)
family room (10 cfm)
Master bedroom (20 cfm)
Bedroom #1 (10 cfm)
Bedroom #2 (10 cfm)
Bedroom #3 (10 cfm)
Bathroom #1 (10 cfm)
Bathroom #2 (10 cfm)
Bathroom #3 (10 cfm)
Laundry room (10 cfm)
Basement (20 cfm)
Total 150
cfm
ASHRAE Standard 62-1989
Volume of basement 10560 ft3
Volume of main floor 10560 ft3
Volume of second floor 10560 ft3
Total volume 31680 ft3
x 0.35/h
11090 ft3/h
÷ 60 (min/h)
Total 185 cfm
1320 ft2
Second floor Main floor
Basement

7
3.0 Unit Type & Defrost Setting vs Geographical Location
HORAGE
WHITEHORSE
JUNEAU
HAY RIVER
YELLOWKNIFE
Prince Rupert GRANDE PRAIRIE
FORT MCMURRAY
ZONE A
FORT SMITH
EDMONTON
PRINCE ALBERT
SASKATOON
JASPER
KAMLOOPS
CALGARY
PENTICTON REGINA
LETHBRIDGE
HELENA
VICTORIA
OLYMPIA
WINNIPEG
SALEM
BOISE
BISMARCK
SALT LAKE CITY
SAULT STE MARIE
ST. PAUL
DES MOINES
MADISON
TIMMINS
HARRISBURG
SACRAMENTO
DENVER
TOPEKA
SUDBURY
TORONTO
DETROIT
INDIANAPOLIS
SANTA FE
SPRINGFIELD
OKLAHOMA CITY
PHOENIX
COLUMBUS
NASHVILLE
ATLANTA
BATON ROUGE
AUSTIN
COLUMBIA
RALEIGH
WASHINGTON
OTTAWA
NORTH BAY
VAL-DOR
CHICOUTIMI
HARTFORD
CHIBOUGAMAU
MONTRÉAL
QUEBEC
BOSTON
GOOSE BAY
LABRADOR CITY
SEPT-ILES
MATANE
GASPÉ
BATHURST
ST-JOHN HALIFAX
CHARLOTTETOWN
ST JO
ZONE C
ZONE B
RENO
VN0001
ZONE A Solo is recommended.
Set :”extended defrost”
according to Section 9.
ZONE B Solo is recommended but if a Duo unit is used, it has to
be oversized (because of its high humidity transfer efficiency). Set “
extended defrost” according to Section 9.
ZONE C Solo or Duo (any models). “Extended defrost” not required
(factory defrost strategy pre-set).
SYMPTOM SOLUTION
(condensation)
Indoor air quality problem DUO and / or
Excess moisture problem DUO
and/or
Important excess moisture problem SOLO
V
Q
0013
ZONE B & C SELECTION CHART
NORTH AMERICA

VF
00
1
9
VF
00
1
8
VF
00
1
7
8
4.1 AIR DISTRIBUTION (NORMAL OPERATION)
4.2 AIR DISTRIBUTION (DEFROST AND/OR FILTRATION MODE)
4.0 Technical Data
VF
00
1
6
SOLO DUO
STALE AIR
FROM BUILDING
SOLO FILTERED AIR
TO BUILDING
DUO
FRESH AIR
FROM OUTSIDE
STALE AIR
FROM BUILDING
FRESH AIR
FROM OUTSIDE
FRESH AIR
TO BUILDING
STALE AIR
TO OUTSIDE
FRESH AIR
TO BUILDING
STALE AIR
TO OUTSIDE
STALE AIR
FROM BUILDING
FILTERED AIR
TO BUILDING
STALE AIR
FROM BUILDING
SOLO units
DUO units
Celcius (˚C)
-5
-15
-27
Fahrenheit (˚F)
23
5
-17
Defrosting (min.)
6
6
6
Operation time (min.)
between each defrost cycle
60
32
20
Defrosting (min.)
10
10
10
Operation time (min.)
between each defrost cycle
30
20
15
Outside Temperature Defrost Cycles Extended Defrost Cycles
Celcius (˚C)
-5
-15
-27
Fahrenheit (˚F)
23
5
-17
Defrosting (min.)
9
9
9
Operation time (min.)
between each defrost cycle
60
32
20
Defrosting (min.)
10
10
10
Operation time (min.)
between each defrost cycle
30
20
15
Outside Temperature Defrost Cycles Extended Defrost Cycles

9
4.0 Technical Data (cont’d)
4.3 PERFORMANCE CHARTS
MODEL NUMBER: SOLO 1.5
Electrical requirements: 120 volts, 1.3 amps.
Exhaust air transfer ratio: 0.01
External Static Pressure - Pascals
(250 Pascals = 1” of water)
Gross Air Flow -L/s (0.47L/s = 1cfm)
225
200
175
150
125
100
75
50
25
005025 75 100 125 150
VG0010
ENERGY PERFORMANCE
Supply Net Average Sensible Recovery Apparent Sensible Latent Recovery
Temperature Air Flow Power Efficiency Effectiveness Moisture Transfer
°C °F L/s cfm watts % %
0 32 31 66 85 69 81 -0.01
0 32 56 119 124 60 70 -0.01
032
-25 -13 37 78 114 62 80 0.08
-25 -13
Total Recovery Efficiency
35 95 Not tested
35 95
COOLING
HEATING
VENTILATION PERFORMANCE
External Static Net Supply Gross Air Flow
Pressure Air Flow Supply Exhaust
Pa in. w.g. L/s cfm L/s cfm L/s cfm
25 0.1 83 175 83 176 82 175
50 0.2 79 168 80 169 78 165
75 0.3 75 159 75 159 75 158
100 0.4 71 150 71 151 69 146
125 0.5 64 136 64 136 60 127
150 0.6 60 126 60 127 48 103
175 0.7 53 113 53 113 38 80
200 0.8 43 91 43 91 21 45
Supply
(l/s)
Exhaust
(l/s)
External Static Pressure - Pascals
(250 Pascals = 1” of water)
225
200
175
150
125
100
75
50
25
0
05025 75 100 125 150
VG0011
MODEL NUMBER: SOLO 2.0
Electrical requirements: 120 volts, 2.1 amps.
Exhaust air transfer ratio: 0.01
VENTILATION PERFORMANCE
External Static Net Supply Gross Air Flow
Pressure Air Flow Supply Exhaust
Pa in. w.g. L/s cfm L/s cfm L/s cfm
25 0.1 110 234 112 237 112 237
50 0.2 104 219 105 223 106 225
75 0.3 98 208 100 211 99 210
100 0.4 89 189 91 192 91 193
125 0.5 84 177 85 180 82 174
150 0.6 71 151 72 153 71 149
175 0.7 64 136 65 138 44 94
ENERGY PERFORMANCE
Supply Net Average Sensible Recovery Apparent Sensible Latent Recovery
Temperature Air Flow Power Efficiency Effectiveness Moisture Transfer
°C °F L/s cfm watts % %
0 32 56 119 124 60 70 -0.01
0 32 86 182 197 53 62 -0.01
-25 -13 37 78 114 62 80 0.08
-25 -13
Total Recovery Efficiency
35 95 Not tested
35 95
COOLING
HEATING
Supply
(l/s)
Exhaust
(l/s)
Gross Air Flow -L/s (0.47L/s = 1cfm)

10
4.3 PERFORMANCE CHARTS (CONT’D)
4.0 Technical Data (cont’d)
External Static Pressure - Pascals
(250 Pascals = 1” of water)
225
200
175
150
125
100
75
50
25
005025 75 100 125 150
VG0008
MODEL NUMBER: DUO 1.2
Electrical requirements: 120 volts, 1.4 amps.
Exhaust air transfer ratio: 0.01
VENTILATION PERFORMANCE
External Static Net Supply Gross Air Flow
Pressure Air Flow Supply Exhaust
Pa in. w.g. L/s cfm L/s cfm L/s cfm
25 0.1 62 131 62 133 64 137
50 0.2 59 125 60 127 61 130
75 0.3 58 123 58 124 58 123
100 0.4 54 114 55 116 55 117
125 0.5 51 108 52 110 50 107
150 0.6 45 95 45 96 47 99
175 0.7 39 83 39 84 40 85
200 0.8 31 65 31 66 29 62
ENERGY PERFORMANCE
Supply Net Average Sensible Recovery Apparent Sensible Latent Recovery
Temperature Air Flow Power Efficiency Effectiveness Moisture Transfer
°C °F L/s cfm watts % %
0 32 32 68 108 77 87 0.61
0 32 56 119 156 71 81 0.56
032
-25 -13 51 108 189 66 82 0.69
-25 -13
Total Recovery Efficiency
35 95 31 66 103 75
35 95 55 117 151 69
COOLING
HEATING
Gross Air Flow -L/s (0.47L/s = 1cfm)
Supply
(l/s)
Exhaust
(l/s)
External Static Pressure - Pascals
(250 Pascals = 1” of water)
225
200
175
150
125
100
75
50
25
005025 75 100 125 150
VG0009
MODEL NUMBER: DUO 1.4
Electrical requirements: 120 volts, 1.4 amps.
Exhaust air transfer ratio: 0.02
VENTILATION PERFORMANCE
External Static Net Supply Gross Air Flow
Pressure Air Flow Supply Exhaust
Pa in. w.g. L/s cfm L/s cfm L/s cfm
25 0.1 69 145 70 148 78 165
50 0.2 65 137 66 140 72 153
75 0.3 60 127 61 129 65 138
100 0.4 57 120 58 123 60 127
125 0.5 49 104 50 106 49 104
150 0.6 43 91 44 93 42 89
175 0.7 30 64 31 66 31 66
200 0.8 22 46 22 47 23 49
ENERGY PERFORMANCE
Supply Net Average Sensible Recovery Apparent Sensible Latent Recovery
Temperature Air Flow Power Efficiency Effectiveness Moisture Transfer
°C °F L/s cfm watts % %
0 32 32 68 110 70 80 0.79
0 32 47 100 164 65 74 0.67
0 32 57 121 172 64 72 0.60
-25 -13 29 61 120 64 79 0.65
-25 -13
Total Recovery Efficiency
35 95 31 66 104 69
35 95 57 121 168 61
COOLING
HEATING
Supply
(l/s)
Exhaust
(l/s)
Gross Air Flow -L/s (0.47L/s = 1cfm)

11
4.3 PERFORMANCE CHARTS (CONT’D)
4.0 Technical Data (cont’d)
MODEL NUMBER: DUO 1.9
Electrical requirements: 120 volts, 2.2 amps.
Exhaust air transfer ratio: 0.01
External Static Pressure - Pascals
(250 Pascals = 1” of water)
225
200
175
150
125
100
75
50
25
005025 75 100 125 150
VG0010
VENTILATION PERFORMANCE
External Static Net Supply Gross Air Flow
Pressure Air Flow Supply Exhaust
Pa in. w.g. L/s cfm L/s cfm L/s cfm
25 0.1 97 206 98 208 100 233
50 0.2 95 202 96 204 106 224
75 0.3 89 189 90 191 100 211
100 0.4 85 180 86 182 94 199
125 0.5 80 169 81 171 89 189
150 0.6 74 157 75 159 81 173
175 0.7 65 138 66 139 73 156
200 0.8 56 119 57 120 59 125
225 0.9 34 71 34 72 26 56
ENERGY PERFORMANCE
Supply Net Average Sensible Recovery Apparent Sensible Latent Recovery
Temperature Air Flow Power Efficiency Effectiveness Moisture Transfer
°C °F L/s cfm watts % %
0 32 56 119 156 71 81 0.56
0 32 84 178 230 65 72 0.46
032
-25 -13 51 108 189 66 82 0.69
-25 -13
Total Recovery Efficiency
35 95 55 117 151 69
35 95
COOLING
HEATING
Gross Air Flow -L/s (0.47L/s = 1cfm)
Supply
(l/s)
Exhaust
(l/s)

12
4.0 Technical Data (cont’d)
Main controls:
• Venta
• Supra
• Ultima
Optional controls:
• 20/40/60-minute
push-button timer
• 20-minute wireless
push-button timer
• 60-minute crank timer
• Dehumidistat
Link options:
• Furnace interlock
(used with forced
air systems)
• Interface for the Perfect
Climate Comfort Center™
(Honeywell control, W8900)
4.5 CONTROLS AND LINK OPTIONS
4.6 SPECIFICATIONS
Model
Weight
Port Diameter
Drain Diameter
Solo 1.5
71 lbs (32 kg)
6” (152 mm)
1/2” (12 mm)
Solo 2.0
73 lbs (33 kg)
6” (152 mm)
1/2” (12 mm)
Duo 1.2
79 lbs (36 kg)
6” (152 mm)
N/A
Duo 1.4
75 lbs (34 kg)
6” (152 mm)
N/A
Duo 1.9
77 lbs (35 kg)
6” (152 mm)
N/A
Installation Chains, springs and hooks (provided with the unit).
Motor Speed High and low speed factory set (optional increased or decreased low speed).
Electrical supply 120 V, 60 Hz 120 V, 60 Hz 120 V, 60 Hz 120 V, 60 Hz 120 V, 60 Hz
Power 150 watts 240 watts 160 watts 160 watts 250 watts
Consumption
16 1/2"
(419 mm)
17 1/8" (435 mm)
30 1/4" (768 mm)
6" (152 mm)
VK0029
4.4 DIMENSIONS

13
5.0 Typical Installations
(Primarily for homes with radiant hot water or
electric baseboard heating. See figure 1.)
Moist, stale air is exhausted from the high
humidity areas in the home, such as
bathrooms, kitchen and laundry room. Fresh air
is supplied to bedrooms and principal living
areas.
The use of bathroom fans and a range hood is
suggested to exhaust stale air.
Homes with more than one level require at least
one exhaust register at the highest level.
5.1 FULLY DUCTED SYSTEM
There are three (3) common installation methods.
VH0002
*Installations may vary according to the model number and the position (normal or
reverse) in which the unit is installed.
figure 1
See 6.4.1
for details
5.2 EXHAUST DUCTED SYSTEM (SOURCE POINT VENTILATION)
(For homes with forced air heating. See figure 2.)
Moist, stale air is exhausted from the high humidity
areas in the home, such as bathrooms, kitchen and
laundry room. Fresh air is supplied to the cold air
return or the supply duct of the furnace. The use of
bathroom fans and a range hood is suggested to
exhaust stale air.
Homes with more than one level require at least one
exhaust register at the highest level.
NOTE: For this type of installation, it is not essential
that the furnace blower runs when the unit is
in operation, but we recommend it.
VH0006
See 6.4.2
for details
figure 2
5.3 SIMPLIFIED (VOLUME VENTILATION)
(For homes with forced air heating. See figure 3.)
Fresh air and exhaust air flow through the furnace
ducts which simplifies the installation.
The use of bathroom fans and a range hood is
suggested to exhaust stale air.
NOTE: For this type of installation, the furnace
blower should be running when the unit is
in operation.
VH
0007
figure 3
See 6.4.3
for details

6.2 PLANNING OF THE DUCTWORK
14
6.0 Installation
INSPECT THE CONTENTS OF THE BOX
• Inspect the exterior of the unit for shipping damage. Ensure that there is no damage to the door, door
latches, door hinges, dampers, duct collars, cabinet, etc.
• Inspect the interior of the unit for damage. Ensure that the fan motor assembly, recovery module,
insulation, dampers, damper actuator and condensation tray (Solo) are all intact.
• If the unit was damaged during shipping, contact your local distributor. (Claim must be made within 24
hours after delivery.)
• Use checklist included with the unit to ensure that no parts are missing.
6.1 LOCATING AND MOUNTING THE UNIT
NOTE: Please note that the unit can be installed in either the “normal” or “reverse” (upside down)
position.
Choose an appropriate location for the unit:
• Within an area of the house where the temperature is above 10°C / 50°F
(basement, attic, furnace room, laundry room, etc.).
• Away from living areas (dining room, living room, bedroom), if possible.
• So as to provide easy access to the interior cabinet and to the control
panel on the side of the unit.
• Close to an exterior wall, so as to limit the length of the insulated flexi-
ble duct to and from the unit.
• Close to a drain. If no drain is close by, use a pail to collect run-off.
(Solo models only.)
• Away from hot chimneys, electrical panel and other fire hazards.
• Allow for a power source (standard outlet).
Hang the unit with the 4 chains and springs provided (see figures 4 and 5).
VD0037
VD0038
level
1/8"
(3 mm)
VD0039A
figure 4
figure 5
figure 6
CAUTION
Make sure the unit is level, with a 1/8’’ (3 mm) tilt
backwards (see figure 6).
a) Follow the instructions in Section 6.3 next page to determine the appropriate duct diameters for your
system.
b) Keep it simple. Plan for a minimum number of bends and joints. Keep the length of insulated duct to
a minimum.
c) Do not use wall cavities as ducts. Do not use branch lines smaller than 4” (102 mm) Ø.
d) Do not ventilate crawl spaces or cold rooms. Do not attempt to recover the exhaust air from a dryer or
a range hood. This would cause clogging of the recovery module. Use sheet metal for the kitchen
exhaust duct.
e) Be sure to plan for at least one exhaust register on the highest lived-in level of the house if it has 2
floors or more.

15
6.0 Installation (cont’d)
Use the table below to ensure that the ducts you intend to install will be carrying air flows at or
under the recommended values. Avoid installing ducts that will have to carry air flows near the
maximum values and never install a duct if its air flow exceeds the maximum value.
NOTE: Examples 6.2.1 and 6.2.2 use imperial measures.
The same calculation applies to metric measures.
6.3.1 Example of calculation:
Problem: My installation requires two exhaust registers (one for the kitchen, one for the bathroom).
I will connect these registers to a main duct which will connect to the unit (high speed performance
value of 140 cfm). What size of duct should I use for the main exhaust duct and for the two end
branches leading to the registers? (See figure 7.)
Solution: Simplified method. (For a more detailed method of calculating duct size refer to the
ASHRAE or HRAI HANDBOOK).
Main duct: Table above indicates a 6” Ø duct: recommended air flow: 120 cfm; maximum air flow:
180 cfm. The high speed air flow of 140 cfm is close enough to the recommended value (120) and
far enough away from the maximum value (180). Therefore a 6ӯ duct or larger is an appropriate
choice for the main exhaust duct.
End branches: Each end branch will have to transport an air flow of 70 cfm (140 divided by 2).
Table above indicates a 5ӯ duct: recommended air flow: 75 cfm; maximum air flow: 110 cfm. The
high speed air flow of 70 cfm is close enough to the recommended value (75) and far enough away
from the maximum value (110). Therefore a 5ӯ duct or larger is an appropriate choice for the 2
end branches.
NOTE:A 4ӯ duct would have been too small because the maximum acceptable value for a 4ӯ
duct is 60 cfm.
6.3 CALCULATING THE DUCT SIZE
VI0003
end
branches
main branch
6”ø 140 cfm
5”ø
70 cfm
4”(102 mm) 40 cfm 19 l/s 68 m3/h 60 cfm 28 l/s 102 m3/h
5”(127 mm) 75 cfm 35 l/s 127 m3/h 110 cfm 52 l/s 187 m3/h
6”(152 mm) 120 cfm 57 l/s 204 m3/h 180 cfm 85 l/s 306 m3/h
7”(178 mm) 185 cfm 87 l/s 314 m3/h 270 cfm 127 l/s 459 m3/h
8”(203 mm) 260 cfm 123 l/s 442 m3/h 380 cfm 179 l/s 645 m3/h
Duct Recommended Maximum
Diameter Air Flow Air Flow
figure 7
6.3.2 Example of a design for a fully ducted system for a unit having a high
speed performance of 222 cfm (See figure 8).
VI0004
4” Ø
42 cfm
6” Ø
129 cfm
5” Ø
65 cfm
5” Ø
6” Ø
93 cfm
5”
6”
7” 7” 6”
6”
6”
4”
4”
4” 4”
4” Ø 42 cfm
6” Ø 84 cfm
6” Ø 96 cfm
6” Ø 138 cfm
7” Ø 222 cfm 7” Ø 222 cfm

16
6.0 Installation (cont’d)
6.4 INSTALLING THE DUCTWORK AND REGISTERS
WARNING
Never install a stale air exhaust register in a room where there is a combustion device, such as a
gas furnace, a gas water heater or a fireplace.
!
6.4.1 Fully Ducted System (as illustrated in Section 5.1)
Stale air exhaust ductwork:
• Install registers in areas where contaminants are produced: kitchen, bathrooms, laundry
room, etc.
• Install registers 6 to 12 inches (152 to 305 mm) from the ceiling on an interior wall OR install
them in the ceiling.
• Install the kitchen register at least 4 feet (1.2 m) from the range.
• If possible, measure the velocity of the air flowing through the registers. If the velocity is higher
than 400 ft/min. (122 m/min), then the register type is too small. Replace with a larger one.
Fresh air distribution ductwork:
• Install registers in bedrooms, dining room, living room and basement.
• Install registers either in the ceiling or high on the walls with air flow directed towards the ceiling.
(The cooler air will then cross the upper part of the room, and mix with room air before
descending to occupant level.)
• If a register must be floor installed, direct the air flow up the wall.
6.4.2 Exhaust Ducted System (Source Point Ventilation) (as illustrated in Section 5.2)
Stale air exhaust ductwork: (same as for Fully Ducted System, described on point 6.4.1)
Fresh air distribution:
There are two methods for connecting the unit to the furnace:
Method 1: supply side connection
• Cut an opening into the furnace supply duct at least
18 inches (0.5 m) from the furnace.
• Connect this opening to the fresh air distribution port
of the HRV/ERV (use steel duct, see figure 9).
• Make sure that the HRV/ERV duct forms an elbow
inside the furnace ductwork.
• If desired, interlock (synchronize) the furnace blower
operation with the HRV/ERV operation. (See Section 8.5).
Method 2: return side connection
• Cut an opening into the furnace return duct not less
than 10 feet (3.1m) from the furnace (A+B).
• Connect this opening to the fresh air distribution port
of the HRV/ERV (see figure 10).
NOTE:For Method 2, it is not essential that the furnace
blower runs when the unit is in operation, but
we recommend it. If desired, synchronize the
furnace blower operation with the HRV/ERV
operation (see Section 8.5).
WARNING
When performing duct connection to the furnace, installation must be done in accordance with all
applicable codes and standards. Please refer to your local building code.
CAUTION
When performing duct connection to the furnace supply duct, this duct must be sized to support
the additional airflow produced by the ERV/HRV. Also, use a steel duct. It is recommended that the
ERV/HRV is running when the furnace is in operation to prevent backdrafting inside ERV/HRV.
!
VD0172
minimum
18” (0.5 m)
Steel duct
figure 9
B
A
VD0108
A+B = not less
than 10’ (3.1 m)
figure 10

17
6.0 Installation (cont’d)
6.4.3 Simplified installation (Volume Ventilation) (as illustrated in Section 5.3)
There are two methods (figures 11 and 12) for connecting the unit to the furnace:
Method 1: return-supply Method 2: return-return
Stale air intake:
• Cut an opening into the furnace return duct (not less than 10 feet (3.1 m) from the furnace).
• Connect this opening to the stale air intake port on the HRV/ERV as shown.
Fresh air distribution: (same instructions as for Method 1 or Method 2, Section 6.4.2).
For Method 2 (return-return) make sure there is a distance of at least 3 feet (0.9 m) between
the 2 connections to the furnace.
NOTE: For Method 1, it is not essential to synchronize the furnace blower operation with the
unit operation, but we recommend it.
6.4 INSTALLING THE DUCTWORK AND REGISTERS (CONT’D)
B
A
VD0171
B
A
minimum 3’
(0.9 m)
Steel duct
minimum
18”
(0.5 m)
figure 12
figure 11
CAUTION
If using Method 2, make sure the furnace blower operation is synchronized with the unit operation!
See Section 8.5.
WARNING
When performing duct connection to the furnace, installation must be done in accordance with all
applicable codes and standards. Please refer to your local building code.
!
A+B = not less
than 10’ (3.1 m)
A+B = not less
than 10’ (3.1 m)
CAUTION
When performing duct connection to the furnace ducts (Method 1), these ducts must be sized to
support the additional airflow produced by the ERV/HRV. Also, the supply duct must be a steel
duct. It is recommended that the ERV/HRV is running when the furnace is in operation to prevent
backdrafting inside ERV/HRV.

18
6.0 Installation (cont’d)
Insulated flexible duct
Use the following procedure for connecting the insulated flexible duct to the ports on the unit (exhaust to
outside and fresh air from outside).
a) Pull back the insulation to expose the flexible duct.
b) Connect the interior flexible duct to the port using a duct tie.
c) Carefully seal the connection with duct tape.
d) Pull the insulation over the joint and tuck it between the inner and outer rings of the double collar.
e) Pull the vapor barrier over the insulation and over the outer ring of the double collar.
f) Apply duct tape to the joint making an airtight seal. Avoid compressing the insulation when you pull the
tape tightly around the joint. Compressed insulation loses its R value and causes water dripping due
to condensation on the exterior surface of the duct.
a) b) c) d), e) f)
Rigid duct:
Use duct tape to connect the rigid ducts to the ports.
Make sure that the 2 balancing dampers are left in a fully open position before connecting the ducts to
these ports (fresh air distribution port and stale air exhaust port as shown on figure 13).
6.5 CONNECTING THE DUCT TO THE UNIT
CAUTION
Make sure that the vapor barrier on the insulated ducts does not tear during installation to avoid
condensation within the duct.
VJ0001
VJ0002
VJ0003
VJ0004
VJ0005
CAUTION
Do not use screws to connect rigid ducts to the ports.
VJ0007
figure 13

19
6.0 Installation (cont’d)
6.6 INSTALLING THE EXTERIOR HOODS
Choose an appropriate location for installing the exterior hoods:
• a minimum distance of 6 feet (1.8 m) between the hoods to avoid cross-contamination
• a minimum distance of 18 inches (457 mm) from the ground
Make sure the intake hood is at least 6 feet (1.8 m) away from any of the following:
• dryer exhaust, high efficiency furnace vent, central vacuum vent
• gas meter exhaust, gas barbecue-grill
• any exhaust from a combustion source
• garbage bin and any other source of contamination
Refer to figure 14 for connecting the insulated duct to the hoods. Place the “FRESH AIR INTAKE” sticker,
provided in the installation kit, on corresponding hood. An “Anti-Gust Intake Hood” should be installed in
regions where a lot of snow is expected to fall.
VD0028
Exhaust
hood
Optional duct
location
Tape and duct tie
Intake
hood
6ӯ
(152 mm)
18”
(457 mm)
18”
(457 mm)
6’
(1.8 m)
6’
(1.8 m)
18”
(457 mm)
figure 14

VO0010
20
6.7 CONNECTING THE DRAIN (SOLO ONLY)
12"
(
305 mm
)
VO0004
VO0008
VO0011
VO0005
To drain
6.0 Installation (cont’d)
To install the drain fittings, punch the 2
knock-out sections located at the
bottom of the unit.
In order to keep the drain pan intact,
hand tighten the 2 plastic drain fittings to
the unit using the gaskets, washers and
VO0012
From the inside, install 2 snap bushings
on top of the unit. Do not punch the 2
knock-out sections.
Cut 2 sections of plastic tubing, about
12” (305 mm) long and attach them to
each drain fitting.
Join the 2 short sections to the “T” junction
and main tube as shown.
Make a water trap loop in the tube to
prevent the unit from drawing unpleasant
odors from the drain source. Make sure
this loop is situated BELOW the “T” as
shown. This will prevent water from
being drawn back up into the unit in
case of negative pressure. Run the tube
to the floor drain or to an alternative
drain pipe or pail. Be sure there is a
slight slope for the run-off.
Tie-wrap
12
34
56
Inside view
Inside view