Venting Requirements - KitchenAid KHTU105RSS1 Installation & Use Manual

Do not terminate the vent system in an attic or other enclosed
area.
Do not use a 4" (10.2 cm) laundry-type wall cap.
Vent system must terminate to the outside.
Use only a 6" (15.2 cm) round metal vent. Rigid metal vent is
recommended. Do not use plastic or metal foil vent.
The size of the vent should be uniform.
The vent system must have a damper. If roof or wall cap has a
damper, do not use damper supplied with the range hood.
Use duct tape to seal all joints in the vent system.
Use caulking to seal exterior wall or roof opening around the
cap.
Determine which venting method is best for your application.
For Best Performance:
Do not install 2 elbows together.
Use no more than three 90° elbows.
If an elbow is used, install it as far away as possible from the
hood's vent motor exhaust opening.
Make sure there is a minimum of 24" (61 cm) of straight vent
between the elbows if more than one elbow is used.
The length of vent system and number of elbows should be kept
to a minimum to provide efficient performance.
Cold Weather Installations
An additional backdraft damper should be installed to minimize
backward cold air flow and a nonmetallic thermal break 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.
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
This range hood is factory set for vented installations. Vent
system can terminate through either the roof or wall. A
6" (15.2 cm) round vent system must be used. The vent system
length should not exceed 35 ft (10.7 m).
Option 1 - Roof Venting
B
A
A. 6" (15.2 cm) round roof venting
B. Roof cap

Venting Requirements

Option 2 - Wall Venting
A
B
A. 6" (15.2 cm) round wall venting
B. Wall cap
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 6" (15.2 cm) round
45° elbow 2.5 ft (0.8 m)
90° elbow 5.0 ft (1.5 m)
Example vent system
90˚ elbow
2 ft
(0.6 m)
Maximum length = 35 ft (10.7 m)
1- 90° elbow = 5 ft (1.5 m)
8 ft (2.4 m) straight = 8 ft (2.4 m)
1 - wall cap = 0 ft (0 m)
System length = 13 ft (3.9 m)
NOTE: Flexible vent is not recommended. Flexible vent creates
back pressure and air turbulence that greatly reduce
performance.
wall cap
6 ft (1.8 m)
5