Venting Requirements
■ 36" (91.4 cm) model requires a 6" (15.2 cm) round vent |
system. 48" (121.9 cm) model requires two 6" round vent |
Vent system can terminate either through the roof or wall. To vent through a wall, a 90° elbow is needed.
roof cap
systems or a 10" (25.4 cm) round system using vent transition |
kit number 4396915. |
■ Vent system must terminate to the outside. |
■ Do not terminate the vent system in an attic or other enclosed |
area. |
■ Do not use 4" (10.2 cm) |
■ Use metal vent only. Rigid metal vent is recommended. Do |
not use plastic or metal foil vent. |
For the most efficient and quiet operation:
■ Use a straight run or as few elbows as possible. |
■ Use no more than three 90° elbows. |
■ Make sure there is a minimum of 24" (61 cm) of straight vent |
between the elbows if more than one elbow is used. |
■ Do not install two elbows together. |
■ Use duct tape to seal all joints in the vent system. |
6" |
(15.2 cm) |
round vent |
Roof venting
6"
(15.2 cm) 
round vent
wall cap
Wall venting
■ Use caulking to seal exterior wall or roof opening around |
the cap. |
Cold weather installations
An additional backdraft damper should be installed to minimize backward cold air flow and a nonmetallic thermal break to minimize conduction of outside temperatures 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.
Make up air
Local building codes may require the use of
Consult your HVAC professional for specific requirements in your area.
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.
Maximum equivalent vent length is 35 feet (10.7 meters) for 6" (15.2 cm) vent, 60 feet (18.3 m) for 10" (25.4 cm) vent.
Vent piece | 6" (15.2 cm) round or |
| 10" (25.4 cm) round |
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45° elbow | 2.5 ft (0.8 m) |
90° elbow | 5.0 ft (1.5 m) |
Venting Methods
This canopy hood is factory set for venting through the roof or wall.
The 36" (91.4 cm) model requires a 6" (15.2 cm) round vent system for installation (not included). The 48" (121.9 cm) model requires two 6" (15.2 cm) round vent systems or a 10" (25.4 cm) round vent system for installation. The hood exhaust opening is 6" (15.2 cm) round.
NOTE: Flexible vent is not recommended. Flexible vent creates back pressure and air turbulence that greatly reduces performance.
Example vent system
| 90° elbow |
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| 6 ft. (1.8 m) |
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Maximum length |
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| = 5 ft (1.5 m) | |||||||||||
8 ft (2.4 m) straight |
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| = 8 ft (2.4 m) | ||||||||||
1 - wall cap |
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System length |
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