Installation Instructions

6
Product Dimensions
Venting Requirements
■ Vent system must terminate to the outdoors.
■ 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.
■ 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 efcient performance.
For the most efcient 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 one elbow is used.
■ Do not install two elbows together.
■ Use clamps to seal all joints in the vent system.
■ 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 ow 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 specied CFM of air
movement. The specied CFM varies from locale to locale.
Consult your HVAC professional for specic requirements in your
area.
Venting Methods
Typical Internal Blower Motor System Venting
Installations
A 10" (25.4 cm) round vent system is needed for installation
(notincluded). The hood exhaust opening is 10" (25.4 cm) round.
NOTE: Flexible vent is not recommended. Flexible vent creates
back pressure and air turbulence that greatly reduce
performance.
10
1
/
8
" (25.7 cm)
27
5
/
8
" (70.1 cm)
29
13
/
16
" (75.8 cm)
35
7
/
8
" (91.1 cm) for 36" models
47
7
/
8
" (121.6 cm) for 48" models
4
13
/
16
" (12.2 cm)
12
3
/
8
"
(31.4 cm)
11
1
/
2
"
(29.2 cm)
5
1
/
16
"
(12.8 cm)
22" (55.9 cm)
11" (27.9 cm)
18" (45.7 cm) for 36" models
24" (61.0 cm) for 48" models
A
B
B
A
A. 10" (25.4 cm) round vent
B. Roof cap
A. 10" (25.4 cm) round vent
B. Wall cap
Roof Venting
Wall Venting