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Equivalent Number Equivalent
Duct Pieces Length* x Used = Length
5″ round
to 3
1
⁄4″ x 10″
transition
90° elbow 37 ft. x ( ) = ft.
6″ round
to 3
1
⁄4″ x 10″
transition
90° elbow 4 ft. x ( ) = ft.
3
1
⁄4″ x 10″
to 6″ round
transition 2 ft. x ( ) = ft.
3
1
⁄4″ x 10″
to 6″ round
transition
90° elbow 4 ft. x ( ) = ft.
Tapered
5″ round
to 6″ round
transition 6 ft. x ( ) = ft.
5″ round collar
to 6″ round
cap transition 13 ft. x ( ) = ft.
5″ round
wall cap
with damper 84 ft. x ( ) = ft.
6″ round
wall cap
with damper 24 ft. x ( ) = ft.
3
1
⁄4″ x 10″
wall cap
with damper 24 ft. x ( ) = ft.
6″ round
roof cap 33 x ( ) = ft.
Subtotal Column 2 = ft.
Subtotal Column 1 = ft.
TOTAL DUCTWORK = ft.
Should not exceed 100 feet.
If flexible metal ducting is used, all the equivalent feet
values in the table should be doubled. The flexible metal
duct should be straight and smooth and extended as
much as possible.
DO NOT use flexible plastic ducting.
Vent installation should not exceed 100 feet equivalent
length.
Blower is rated at 400 CFM at 0.1 inch of water back
pressure.
34
INSTALLATION INSTRUCTIONS
(continued)
TABLE 1
Calculate Total Equivalent Ductwork Length
Equivalent Number Equivalent
Duct Pieces Length*x Used = Length
5″ round
straight 2.7 x ( ft.)
†
= ft.
6″ round
straight 1 x ( ft.)
†
= ft.
3
1
⁄4″ x 10″
straight 1 x ( ft.)
†
= ft.
5″, 90°
elbow 37 ft. x ( ) = ft.
6″, 90°
elbow 12 ft. x ( ) = ft.
5″, 45°
elbow 18 ft. x ( ) = ft.
6″, 45°
elbow 7 ft. x ( ) = ft.
Flexible
Metal Offset See Calculations
Adapter in Step 5A ft.
3
1
⁄4″ x 10″
90° elbow 14 ft. x ( ) = ft.
3
1
⁄4″ x 10″
45° elbow 8 ft. x ( ) = ft.
3
1
⁄4″ x 10″
90° flat elbow 33 ft. x ( ) = ft.
5″ round
to 3
1
⁄4″ x 10″
transition 3 ft. x ( ) = ft.
6″ round
to 3
1
⁄4″ x 10″
transition 2 ft. x ( ) = ft.
Subtotal Column 1 = ft.
* Equivalent lengths of duct pieces are based
on actual tests and reflect requirements for good
venting performance with any downdraft cooktop.
† Measure and list feet of straight duct used.
Count and list the quantity of all other duct pieces
for the “Number Used” of each type.
IMPORTANT
For maximum efficiency, use the shortest and
straightest duct run possible, with as few fittings
as possible. For satisfactory performance,
the duct run should not exceed 100 feet
equivalent length.
Venting performance is improved by using larger
diameter duct.
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