GE PP989 Owner's Manual And Installation Instructions page 16
Radiant downdraft cooktop
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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.) t-
ft.
6" round
straight
1 ft.
×
(ft.) t-
ft.
3¼" x i0"
straight
1 ft.
x
(
ft.Y-
ft.
5", 90°
(_
elbow
37 ft.
x
(
1=
ft.
6", 90°
elbow
12 ft.
x
(
)-
ft.
5", 45°
elbow
18 ft.
×
(
)=
ft.
6", 45°
elbow
7 ft.
x
(
)-
ft.
Flexible
metal offset
adapter
34 ft.
x
(
)-
ft.
3½" x i0"
90° elbow
14 ft.
x
(
):
ft.
3½" x 10"
45° elbow
8 ft.
x
(
):
ft.
3½" x i0"
90° flat elbow
33 ft.
x
(
):
ft.
5" round
[_to
3½" x 10"
transition
3 ft.
x
(
)=
ft.
6" round
to 3½" x 10"
transition
2 ft.
x
(
)-
ft.
Subtotal Column 1 -
ft.
*Equivalentlengthsof duct piecesare basedon actual
tests and reflect requirementsfor good venting
performancewith any downdraft cooktop.
1-1Vleasure
and list feet of straight duct used.Count and
listthe quantity of all other duct piecesfor 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
to3½" x i0"
_
transition
90° elbow
37 ft.
x
(
)=
ft.
6" round
to3½" x i0"
transition
90° elbow
a,ft.
x
(
)-
ft.
_
3½"x i0"
to 6" round
transition
2 ft.
x
(
)=
ft.
3½" x ilO"
to 6"round
transition
90° elbow
4 ft.
×
(
)=
ft.
Tapered 5"
round to
6" round
transition
6 ft.
x
(
)-
ft.
S" round collar
to 6" round
transition
13 ft.
x
(
)-
ft.
S" round
wall cap
C_
with damper
84 ft.
x
(
)=
ft.
6" round
wall cap
with damper
24 ft.
x
(
)-
ft.
3½" x i0"
wall cap
with damper
__
6" round
roof cap
24 ft.
x
(
)-
33ft.
x
(
l-
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.
16
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