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TABLE!
CalculateTotal Equivalent DuctworkLength
Equivalent Number Equivalent
Duct Pieces Length*x Used = Length
5" round
straight 2.7 X ( ft.)t= ft.
6" round
straight 1 X ( ft.)t= ft.
31/4"X 10"
straight 1 X ( ft.)t= ft.
(_ 5", 90°
elbow 37 ft. X ( ) = ft.
6", 90°
elbow 15 ft. X ( ) = ft.
@ 5", 45°
elbow 18 ft. X ( ) = ft.
6", 45°
elbow 9 ft. X ( ) = ft.
Flexible
Metal Offset See Calculations
Adapter in Step 5A ft.
31/4" x 10"
90°elbow 16 ft. X ( ) = ft.
31/4" x 10"
45° elbow 5 ft. x ( ) = ft.
31/4. x10 ,
90° flatelbow 18 ft. X ( ) = ft.
5" round
_ to 31/4" x 10"
transition 3 ft. x ( ) = ft.
6" round
to 31/4"x 10"
transition 7 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 downdraSt 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.
Equivalent Number Equivalent
Duct Pieces Length* x Used = Length
5" round
to31/4"x10"
transition
90° elbow 37 ft. X ( ) = ft.
S" round
tO 31/4" X 10"
transition
90°elbow 20 ft. X ( ) = ft.
31/4" X 10"
to6" round
transition 5 ft. x ( ) = ft.
31/4.x10 ,
to 6" round
transition
90°elbow 12 ft. X ( ) = ft.
Tapered
5" round
to6" round
transition ft.
5" round collar
to 6" round
cap transition ft.
5" round
wall cap
(_ with damper ft.
6" round
wall cap
with damper ft.
@ 1/4"X10"
wall cap
with damper ft.
_1_ 6" round
roof cap ft.
6" round
roof vent
6ft. x( )=
13ft. x ( )=
84 ft. x ( ) =
21ft. x ( )=
27ft. x ( ) =
20 x ( )=
24 x ( )=
Subtotal Column 2 =
Subtotal Column 1 =
TOTAL DUCTWORK =
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.
32
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