GE PP989DNBB Use and Care Manual - Page 18

DuCTWORK CAlCulATIONs, DO NOT USE FLExibLE pLaStic dUcting. - installation

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Installation Instructions Ductwork calculations Calculate Total Equivalent Ductwork Length Duct Pieces Equivalent Length* x Number Used = Equivalent Length 5" round straight 2.7 ft. x ( ft.)† = ft. 6" round straight 1 ft. x ( ft.)† = ft. 31⁄4" x 10" straight 1 ft. x ( ft.)† = ft. 5", 90° elbow 37 ft. x ( ) = ft. 6", 90° elbow 12 ft. x ( ) = ft. 5", 45° elbow 18 ft. x ( ) = ft. 6", 45° elbow 7 ft. x ( ) = ft. Flexible metal offset adapter 34 ft. x ( ) = ft. 31⁄4" x 10" 90° elbow 14 ft. x ( ) = ft. 31⁄4" x 10" 45° elbow 8 ft. x ( ) = ft. 31⁄4" x 10" 90° flat elbow 33 ft. x ( ) = ft. 5" round to 31⁄4" x 10" transition 3 ft. x ( ) = ft. 6" round to 31⁄4" x 10" transition 2 ft. x ( ) = ft. Subtotal Column 1 = ft. *E quivalent lengths of duct pieces are based on actual tests and reflect requirements for good venting performance with any downdraft cooktop. †M easure 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 Equivalent Number Length* x Used = Equivalent Length 5" round to 31⁄4" x 10" transition 90° elbow 37 ft. x ( ) = ft. 6" round to 31⁄4" x 10" transition 90° elbow 4 ft. x ( ) = ft. 31⁄4" x 10" to 6" round transition 2 ft. x ( ) = ft. 31⁄4" x 10" to 6≤ round transition 90° elbow 4 ft. x ( ) = ft. Tapered 5" round to 6" round transition 6 ft. x ( ) = ft. 5" round collar to 6" round transition 13 ft. x ( ) = ft. 5" round wall cap with damper 84 ft. x ( ) = ft. 6" round wall cap with damper 24 ft. x ( ) = ft. 31⁄4" x 10" wall cap with damper 24 ft. x ( ) = ft. 6" round roof cap 33 ft. x ( ) = ft. Subtotal Column 2 = ft. Subtotal Column 1 = ft. TOTAL DUCTWORK = 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. 18

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CaLcULatE TotaL eqUivaLEnt DUctwork lEngtH
Equivalent
Number
Equivalent
Duct Pieces
Length* x
Used
=
Length
5" round
straight
2°7 ft°
x
(
ft°)
†
=
ft°
6” round
straight
1 ft°
x
(
ft°)
†
=
ft°
3
1
⁄
4
” x 10”
straight
1 ft°
x
(
ft°)
†
=
ft°
5”, 90±
elbow
37 ft°
x
(
) =
ft°
6”, 90±
elbow
12 ft°
x
(
) =
ft°
5”, 45±
elbow
18 ft°
x
(
)
=
ft°
6”, 45±
elbow
7 ft°
x
(
)
=
ft°
Flexible
metal offset
adapter
34 ft°
x
(
)
=
ft°
3
1
⁄
4
” x 10”
90± elbow
14 ft°
x
(
) =
ft°
3
1
⁄
4
” x 10”
45± elbow
8 ft°
x
(
) =
ft°
3
1
⁄
4
” x 10”
90± flat elbow
33 ft°
x
(
)
=
ft°
5” round
to 3
1
⁄
4
” x 10”
transition
3 ft°
x
(
) =
ft°
6” round
to 3
1
⁄
4
” x 10”
transition
2 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°
†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°
Equivalent
Number
Equivalent
Duct Pieces
Length* x
Used
=
Length
5” round
to 3
1
⁄
4
” x 10”
transition
90± elbow
37 ft°
x
(
) =
ft°
6” round
to 3
1
⁄
4
” x 10”
transition
90± elbow
4 ft°
x
(
) =
ft°
3
1
⁄
4
” x 10”
to 6” round
transition
2 ft°
x
(
) =
ft°
3
1
⁄
4
” x 10”
to 6
≤
round
transition
90± elbow
4 ft°
x
(
)
=
ft°
Tapered 5”
round to
6”
round
transition
6 ft°
x
(
)
=
ft°
5” round collar
to 6” round
transition
13 ft°
x
(
)
=
ft°
5” round
wall cap
with damper
84 ft°
x
(
) =
ft°
6” round
wall cap
with damper
24 ft°
x
(
) =
ft°
3
1
⁄
4
” x 10”
wall cap
with damper
24 ft°
x
(
) =
ft°
6" round
roof cap
33 ft°
x
(
) =
ft°
Subtotal Column 2 =
ft°
Subtotal Column 1 =
ft°
TOTAl DuCTWORK =
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°
18
DuCTWORK CAlCulATIONs
InStaLLation InStrUctionS