GE PGP990 Manual Del Usuario página 25

Installation Instructions
DUCTWORK CALCULATIONS
Calculate Total Ec uivalent Ductwork Length
Equivalent Number Equivalent
Duct Pieces Length* x Used = Length
6" round
straight 1 ft. x ( )t = ft.
3YJ' 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
3YJ' x 10"
90° elbow
3VJ' x 10"
45° elbow
3_/J' x 10"
90° flat elbow
6" round
to 3V4" x 10"
transition
34 ft. x ( )=
16 ft. x ( ) =
5 ft. x ( )=
18 ft. x ( )=
ft.
ft.
ft.
ft.
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.
T 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.
Duct Pieces
%
6" round
to 3_/J'x 10"
transition
90° elbow
3YJ' x 10"
to 6" round
transition
3VJ' x 10"
to 6" round
transition
90° elbow
6" round
wall cap
with damper
Equivalent Number
Length* x Used =
20 ft. x ( ) =
5 ft. x ( ) =
12 ft. x ( )=
Equivalent
Length
ft.
ft.
ft.
21ft. x ( )= ft.
3YJ' x 10"
wall cap
with damper 27 ft. x ( )= ft.
6" round
roof cap 20 ft. x ( ) = ft.
6" round
roof vent
24 ft. x
( )=
SubtotalColumn 2 =
SubtotalColumn 1 =
TOTAL DUCTWORK =
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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