Venting Requirements - KitchenAid KWCU480WSS0 Installation Instructions Manual

• Vent system must t erminate totheoutdoors.
• Donotterminate the vent s ystem inanattic orother e nclosed
area.
• Donotuse 4"(10.2 cm)laundry-type wall c aps.
• Use metal vent o nly. R igid metal vent i srecommended.
Plastic o rmetal foilvent i snotrecommended.
• The length o fvent s ystem andnumber ofelbows should be
kept t oaminimum t oprovide e fficient performance.
For the most efficient and quiet operation:
• Use no more than three 90 ° elbows.
• Make sure there is a minimum of 24" (61.0 cm) of straight
vent between the elbows if more than 1 elbow is used.
• Do not install 2 elbows together.
• Use clamps to seal all joints in the vent system.
• The vent system must have a damper. If the roof or wall cap
has a damper, do not use the damper supplied with the range
hood.
• Use caulking to seal exterior wall or roof opening around the
cap.
• The size of the vent should be uniform.
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 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.
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.
Roof Venting Wall Venting
A. Roof cap A. Wall cap
B. 6" (15.2 cm) B. 6" (15.2 cm)
round vent* round vent*
*The 48" (121.9 cm) range hood uses two 6" (15.2 cm) round
vents or transitions to 10" (25.4 cm) round vent using Part
Number 4396915.
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 Equivalent Length
45 ° elbow 2.5 ft
(0.8 m)
90 ° elbow 5.0 ft
(1.5 m)
Venting Methods
A 6" (15.2 cm) round vent system is needed for installation (not
included). The range hood exhaust opening is 6" (15.2 cm) round.
Two 6" (15.2 cm) round vent systems are needed for installation
on 48" (121.9 cm) models.
NOTE: Flexible vent is not recommended. Flexible vent creates
back pressure and air turbulence that greatly reduce
performance.
Vent system can terminate either through the roof or wall. To vent
through the wall, a 90 ° elbow is needed.
The maximum equivalent vent lengths are:
6" (15.2 cm) round vent - 35 ft (10.7 m)
7" (17.8 cm) round vent - 40 ft (12.2 m)
8" (20.3 cm) round vent - 50 ft (15.2 m)
9" (22.9 cm) and 10" (25.4 cm) round vents - 60 ft (18.3 m)
Example vent system
90 ° elbow <-- 6 ft (1.8rn)_1 .... Wall cap
The following example falls within the maximum recommended
vent length.
1 - 90 ° elbow = 5.0 ft (1.5 m)
1 - wall cap = 0.0 ft (0.0 m)
8 ft (2.4 m) straight = 8.0 ft (2.4 m)
Length of system = 13.0 ft (3.9 m)