VENTING REQUIREMENTS
•Vent system must terminate to the outdoors.
•Do not terminate the vent system into an attic or other enclosed area.
•Do not use a 4” (10.2 cm)
•Use a 3¼” x 10” (8.3 x 25.4 cm) rectangular or 7” (17.8 cm) round metal vent. Rigid metal vent is recommended. Plastic or metal foil vent is not recommended.
•The length of vent system and number of elbows should be kept to a minimum to provide efficient performance.
For the most efficient and quiet operation:
• 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 1 elbow is used. |
• Do not install 2 elbows together. |
• Use clamps or duct tape to seal all joints in the |
vent system. |
• The vent system at exit must have a cold air damper. |
Roof Venting
B |
A |
C |
A. 3¼” x 10” (8.3 x 25.4 cm) rectangular or 7” (17.8 cm) round vent through the roof. (purchased separately)
B. Roof cap with damper (purchased separately)
C. 24” (61.0 cm) min. to 30” (76.2cm) above the cooking surface
Wall Venting
A
B
C
A. 3¼” x 10” (8.3 x 25.4 cm) rectangular or 7” (17.8 cm) round vent through the wall or out the top (purchased separately)
B. Wall cap with damper (purchased separately)
C. 24” (61.0 cm) min. to 30” (76.2cm) above the cooking surface
• Use caulking to seal exterior wall or roof opening |
around the cap. |
• Best performances are reached with straight piping, |
without elbows and using smooth pipe. |
• Maximum recomended vent system length: 35 ft (10.7m). |
Cold Weather Installations
An additional back draft damper should be installed to minimize backward cold air flow and a thermal break 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 movement. The specified CFM varies from locale to locale. Consult your HVAC professional for specific requirements in your area.
Venting Methods
Vent system can terminate either through the roof or wall. Use 3¼” x 10” (8.3 x 25.4 cm) rectangular with a maximum vent length of 35 ft (10.7 m) or 7” (17.8 cm) round vent with a maximum length of 50 ft (15.2 m) for vent system.
NOTE
Flexible vent is not recommended. Flexible vent creates both back pressure and air turbulence that greatly reduce performance.
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.
7” (17.8 cm) Round Vent System
Vent Piece
90° elbow | 5.0 ft |
| (1.5 m) |
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7” (17.8 cm) wall cap | 0.0 ft |
| (0.0 m) |
Example Vent System
| 7” (17.8 cm) round |
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| Wall Cap | |||||||
| 90° elbow |
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| 6 ft (1.8 m) |
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| 2 ft (0.6 m) |
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Maximum Recommended Length |
| = 50 ft (15.2 m) | |||||||||
1 | - 90° elbow |
| = 5.0 ft (1.5 m) | ||||||||
8 ft (2.4 m) straight |
| = 8.0 ft (2.4 m) | |||||||||
1 | - wall cap |
| = 0.0 ft (0.0 m) | ||||||||
Length of 7” (17.8 cm) system |
| = 13.0 ft (3.9 m) | |||||||||
