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Do not terminate the vent system into an attic or other
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enclosed area.
Do not use a 4" (102 mm) laundry-type wall cap.
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Use metal vent only. Rigid metal vent is recommended.
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Plastic or metal foil vent is not recommended.
The length of vent system and number of elbows
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should be kept to a minimum to provide efficien
performance.
For the most efficient and quiet ope ation:
Use no more than three 90° elbows.
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Make sure there is a minimum of 24" (610mm) of straight
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vent between the elbows if more than 1 elbow is used.
Do not install 2 elbows together.
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Use clamps or duct tape to seal all joints in the
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vent system.
The vent system at exit must have a cold air damper.
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Use caulking to seal exterior wall or roof opening
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around the cap.
Best performances are reached with straight piping,
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without elbows and using smooth pipe.
Cold Weather Installations
An additional back draft damper should be installed to
minimize backward cold air flow and a thermal b eak
should be installed to minimize conduction of outside tem-
peratures as part of the vent system. The damper should
be on the cold air side of the thermal break.
The break should be as close as possible to where the
vent system enters the heated portion of the house.
Makeup Air
Local building codes may require the use of makeup air
systems when using ventilation systems greater than
specified CFM of air m vement. The specified CFM aries
from locale to locale. Consult your HVAC professional for
specific equirements in your area.
Venting Methods
Vent system can terminate either through the roof or
wall. Use 3¼" x 10" (83 x 254 mm) rectangular with a
maximum vent length of 35 ft (10.7 m) for vent system.
NOTE
Flexible vent is not recommended. Flexible vent
creates both back pressure and air turbulence
that greatly reduce performance.
VENTING REQUIREMENTS
Roof Venting
Calculating Vent System Length
To calculate the length of the system you need, add the
equivalent feet (meters) for each vent piece used in the
system.
These directions are for rectangular vent installation only.
If you choose to use round rigid metal venting the minimum
diameter to use is " " " " " " " " ' ' ' ' " ' " " " " .? ? ? ? ? ?
8"
¼" x 10" (83mm x 254 mm) rectangular Vent System
Vent Piece
3¼" x 10" (83 mm x 254 mm)
90° elbow
3¼" x 10" (83 mm x 254 mm) flat
elbow
3¼" x 10" (83 mm x 254 mm) wall
cap
Example Vent System
3¼" x 10"
(83 x 254 mm)
elbow
2 ft
(0.6 m)
Maximum Recommended Length
1 - 90° elbow
8 ft (2.4 m) straight
1 - wall cap
Length of 3¼" x 10"
(83 mm x 254 mm) system
7
Wall Venting
5.0 ft
(1.5 m)
12.0 ft
(3.7 m)
0.0 ft
(0.0 m)
6 ft (1.8 m)
Wall Cap
= 35 ft (10.7 m)
= 5.0 ft (1.5 m)
= 8.0 ft (2.4 m)
= 0.0 ft (0.0 m)
= 13.0 ft (3.9 m)
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