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Downdraft Vent (cont.)
Exterior mounted vent motor
installation methods
To install ductwork under a concrete slab,
see Insert Sheet.
Do not install exterior vent motor in a window
well.
Island location
Figure 5
Interior wall location
Figure 6
Roof venting
Figure 7
One exterior power vent motor can be used to
operate two downdraft vent systems. The motor
can be operated by either downdraft vent control.
A T-vent Adapter Kit, (Black 4175456, White
4319251, Almond 4319252) must be used and is
available from your dealer or authorized parts
distributor. The maximum length of the ductwork
including elbows for a T-vented system is 45
feet. The T-vent is the equivalent of 10 feet.
Instructions for installing a T-vented system are
included with the kit.
Recommended duct length for
exterior mounted blower
Use 9” duct with a maximum length of 55 feet for
duct system. For best performance use no more
than five 90” elbows.
To calculate the length of the system you need,
add the equivalent feet for each duct piece used
in the system.
See the following example:
9” round
I
Maximum length
= 55 feet
2 - 90 elbows
= loft.
1 - wall cap
= Oft
10 feet straight
= loft.
Length of 9” system =20ft.
Recommended standard fittings
3-l/4” x 14” to 9”
3-l/4” x 14” to 9” 9” to 3-l 14” x 14”
= 4.5 ft.
90” elbow = 5 ft. 90” elbow = 9 ft.
90” elbow = 5 ft.
9” to 3-1/c’ x 14” =
1 ft.
45” elbow = 2.5 ft.
12