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Installation
Instructions
DUCTWORK CALCULATIONS
Calculate
Total Equivalent
Ductwork
Length
Equivalent
Number
Equivalent
Duct Pieces
Length* x
Used -
Length
(_
6" round
straight
1 ft.
x
(
)t =
ft.
3VY' x 10"
straight
1 ft.
x
(
)t=
ft.
(_
6", 90°
elbow
15 ft.
x
(
)=
ft.
6", 45°
elbow
9 ft.
x
(
)=
ft.
24" max.
flexible
metal offset
adapter
34 ft.
x
(
)-
ft.
3VY' x I0"
90° elbow
16 ft.
x
(
)=
ft.
(_
3¼" x 10"
45° elbow
5 ft.
x
(
)=
ft.
3¼" x i0"
90° flat elbow
18 ft.
x
(
)=
ft.
[_
6" round
to 3¼" 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 downdraft cooktop.
TlVleasureand 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.
20
Duct Pieces
%
6" round
to 3¼" x 10"
transition
90° elbow
3¼" x 10"
to 6" round
transition
3¼" x 10"
to 6" round
transition
90° elbow
6" round
wall cap
with damper
Equivalent
Number
Length* x
Used =
20 ft.
x
(
)=
S ft.
x
(
1=
12 ft.
x
(
1=
Equivalent
Length
ft.
ft.
ft.
21ft.
x
(
1-
ft.
3½" x i0"
wall cap
with damper
27 ft.
x
(
)-
ft.
6" round
roof cap
20 ft.
x
(
)-
ft.
6" round
roof vent
24 ft.
x
(
l-
Subtotal Column 2 -
Subtotal Column 1 -
TOTAL DU CTWORK =
ft.
ft.
ft.
ft.
Should not exceed 100 feet.
DO NOT use flexible
plastic ducting.
Vent installation
should not exceed 100 feet
equivalent
length.
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