GE PGP990DENBB Owner's Manual & Installation Instructions page 25

Equivalent
Duct Pieces Length* x
6" round
straight 1 ft.
3 " x 10"
1 4
straight 1 ft.
elbow 15 ft.
elbow 9 ft.
24" max.
Flexible
Metal Offset
Adapter 34 ft.
3 " x 10"
1 4
3 " x 10"
1 4
3 " x 10"
1 4
6" round
to 3 " x 10"
1 4
transition 7 ft.
Subtotal Column 1 =
*Equivalent lengths of duct pieces are based on
actual tests and reflect requirements for good venting
performance with any downdraft cooktop.
list the quantity of all other duct pieces for the "Number
Used" of each type.
For maximum efficiency, use the shortest and straightest
duct run possible, with as few fittings as possible.
Venting performance is improved by using larger
diameter duct.
D
Number Equivalent
Used = Length
x ( ) = ft.
x ( ) = ft.
x ( ) = ft.
x ( ) = ft.
x ( ) = ft.
= ft.
= ft.
x ( ) = ft.
ft.
Duct Pieces
6" round
to 3 " x 10"
1 4
transition
3 " x 10"
1 4
to 6" round
transition
3 " x 10"
1 4
to 6" round
transition
6" round
wall cap
with damper 21 ft.
3 " x 10"
1 4
wall cap
with damper 27 ft.
6" round
roof cap
6" round
roof vent
Vent installation should not exceed 100 feet equivalent
length.
25
Equivalent Number Equivalent
Length* x Used = Length
5 ft. x ( ) =
=
x ( ) =
x ( ) =
20 ft. x ( ) =
24 ft. x ( ) =
Subtotal Column 2 =
Subtotal Column 1 =
Should not exceed 100 feet.
ft.
ft.
ft.
ft.
ft.
ft.
ft.
ft.
ft.