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Installation Instructions
DUCTWORK CALCULATIONS
Calculate Total Equivalent Ductwork Length
Equivalent Number Equivalent
Duct Pieces Length* x Used = Length
5" round
straight 2.7 ft. x ( ft.)_ = ft.
6" round
straight 1ft. x ( ft.)t = ft.
3V," x 10"
straight i ft. 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
adapter 34 ft. x ( ) = ft.
3V_" x 10"
90° elbow 14 ft. x ( )= ft.
3V_"x 10"
45° elbow 8 ft. x ( )= ft.
3V_"x i0"
90° flat elbow 33 ft. x ( )= ft.
5" round
to 3V_"x 10"
transition 3 ft. x ( )= ft.
6" round
to 3V_"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.
TiVleasureand 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.
Equivalent Number Equivalent
Duct Pieces Length* x Used = Length
5" round
to 3V_" x 10"
_i_ transiti°n
90° elbow 37 ft. x ( )= ft.
6" round
to 3V_" x 10"
transition
90° elbow 4 ft. x ( )= ft.
_ 3V_"xlO"
to 6"round
transition 2 ft. x ( )= ft.
_I 3V_"x i0"
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
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.
_ V_"x 10"
wall cap
with damper
6" round
roof cap
2Aft. x ( 1=
33ft. x ( 1=
Subtotal Column 2 =
Subtotal Column 1 =
TOTAL DUCTWORK =
ft,
ft.
ft.
ft.
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.
18
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