GE P385 Use And Care & Installation Manual page 32

TABLE 1
Calculate Total Equivalent Ductwork Length
Equivalent Number
Duct Pieces Length* x
5" round
2.7
straight
6" round
1
straight
" x 10"
3 1 ⁄
4
1
straight
5", 90°
37 ft. x (
elbow
6", 90°
15 ft. x (
elbow
5", 45°
18 ft. x (
elbow
6", 45°
9 ft. x (
elbow
Flexible
Metal Offset See Calculations
Adapter in Step 5A
" x 10"
3 1 ⁄
4
16 ft. x (
90° elbow
" x 10"
3 1 ⁄
4
5 ft. x (
45° elbow
" x 10"
3 1 ⁄
4
90° flat elbow
18 ft. x (
5" round
" x 10"
to 3 1 ⁄
4
3 ft. x (
transition
6" round
" x 10"
to 3 1 ⁄
4
7 ft. x (
transition
Subtotal Column 1
* Equivalent lengths of duct pieces are based
on actual tests and reflect requirements for good
venting performance with any downdraft 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 satisfactor y performance,
the duct run should not exceed 100 feet
equivalent length.
Venting performance is improved by using
larger diameter duct.
32
INSTALLATION INSTRUCTIONS
Equivalent
Used = Length
x ( ft.) †
=
x ( ft.)
†
=
x ( ft.) †
=
)
=
)
=
)
=
)
=
)
=
)
=
)
=
)
=
)
=
=
(continued)
Duct Pieces
5" round
to 3 1 ⁄
4
transition
90° elbow
ft.
6" round
to 3 1 ⁄
4
transition
ft.
90° elbow
" x 10"
3 ⁄
1
ft.
4
to 6" round
transition
ft.
" x 10"
3 1 ⁄
4
to 6" round
ft.
transition
90° elbow
ft.
Tapered
5" round
to 6" round
ft.
transition
5" round collar
to 6" round
ft.
cap transition
5" round
ft.
wall cap
with damper
ft.
6" round
wall cap
ft.
with damper
" x 10"
3 1 ⁄
4
wall cap
ft. with damper
6" round
roof cap
ft.
6" round
ft.
roof vent
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.
Equivalent Number
Length* x Used
" x 10"
37 ft. x (
" x 10"
20 ft. x (
5 ft. x (
12 ft. x (
6 ft. x (
13 ft. x (
84 ft. x (
21 ft. x (
27 ft. x (
20 x (
24 x (
Subtotal Column 2
Subtotal Column 1
TOTAL DUCTWORK=
Should not exceed 100 feet.
Equivalent
= Length
)
= ft.
)
= ft.
)
= ft.
)
= ft.
)
= ft.
)
= ft.
)
= ft.
)
= ft.
)
= ft.
)
= ft.
)
= ft.
= ft.
= ft.
ft.