Whirlpool Ventilation Hood Installation And Use Manual - Page 5

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Venting Requirements

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) laundry-type wall caps.
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.
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 make-up 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
This canopy hood is factory set for venting through the roof.
An 8" (20.3 cm) round vent system is needed for installation (not
included). The hood exhaust opening is 8" (20.3 cm) round.
Vent system can terminate either through the roof or wall. To vent
through a wall, a 90° elbow is needed.
For non-vented (recirculating) installations
Should it not be possible to vent cooking fumes and vapors to
the outside, the hood can be used in the non-vented
(recirculating) version, fitting an activated carbon filter and the
deflector, fumes and vapors are recycled through the top grille.
deflector
8"
(20.3 cm)
round vent
Non-vented
(recirculating)
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.
Vent piece
45° elbow
90° elbow
Maximum equivalent vent length is 50 feet (15.2 meters).
90° elbow
6 ft. (1.8 m)
1 — 90° elbow
2 ft.
(0.6 m)
8 ft. (2.4 m) straight
1 — wall cap
system length
roof cap
8"
(20.3 cm)
round vent
Roof venting
8" (20.3 cm) round
2.5 feet
(0.8 m)
5.0 feet
(1.5 m)
wall cap
Example vent
system
=
5 ft. (1.5 m)
=
8 ft. (2.4 m)
=
0 ft.
(0 m)
= 13 ft. (3.9 m)
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