GE JP389BJBB Use and Care Manual - Page 32

Calculate Total Equivalent Ductwork Length

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TABLE 1 Calculate Total Equivalent Ductwork Length Duct Pieces Equivalent Number Equivalent Length*x Used = Length 5" round (_straight 2.7 X ( ft.)t= ft. 6" round straight 1 X ( ft.)t= ft. 31/4"X 10" straight 1 X ( ft.)t= ft. elbow 37 ft. X ( )= ft. (_ 5", 90° 6", 90 ° elbow 15 ft. X ( )= ft. elbow 18 ft. X ( )= ft. 5", 45 ° 6", 45 ° elbow 9 ft. x ( )= ft. Flexible Metal Offset See Calculations Adapter in Step 5A ft. 3910/°4"exlb1o0w" 16 ft. X ( )= ft. 3415/°4"eXlb1o0w" 5 ft. X ( )= ft. 3910/°4.flxa1t0el,bow 18 ft. X ( )= ft. 5" round transition 3 ft. x ( )= ft. _l to 31/4" x 10" 6" round to 31/4"x 10" transition 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 downdraSt cooktop. I" 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 5" round to 31/4"x10" transition Equivalent Number Equivalent Length* x Used = Length 9StO0"°3r1oe/4ul"bnXdow10" 37 ft. X ( )= ft. transition 90° elbow 20 ft. X ( )= ft. 31/4" X 10" to 6" round transition 5 ft. x ( )= ft. to 6" round 3tr1a/n4s. xit1io0n , 90° elbow 12 ft. X ( )= ft. Tapered 5to" 6r"ournodund transition 6ft. x( )= ft. 5" round collar to 6" round cap transition 13ft. x ( )= ft. 5" round wall cap 84 ft. x ( )= (_ w6"ithroduanmd per ft. wall cap with damper 21ft. x ( )= ft. @ w1a/l4l "cXa1p0" with damper 27ft. x ( )= ft. _1_ 6ro"orfocuanpd 20 x ( )= ft. 6ro"orfovuenndt 24 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. Blower is rated at 400 CFM at 0.1 inch of water back pressure. 32

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TABLE1
Calculate Total Equivalent Ductwork Length
Equivalent
Number
Equivalent
Duct Pieces
Length*x
Used
=
Length
5" round
(_straight
2.7
X
(
ft.)t=
ft.
6" round
straight
1
X
(
ft.)t=
ft.
31/4"X 10"
straight
1
X
(
ft.)t=
ft.
(_
5", 90°
elbow
37 ft. X
(
)
=
ft.
6", 90°
elbow
15 ft. X
(
)
=
ft.
5", 45°
elbow
18 ft. X
(
)
=
ft.
6", 45°
elbow
9 ft.
x
(
)=
ft.
Flexible
Metal Offset
See Calculations
Adapter
in Step 5A
ft.
31/4" x 10"
90° elbow
16 ft.
X
(
)
=
ft.
31/4"X 10"
45° elbow
5 ft.
X
(
)=
ft.
31/4. x10
,
90° flatelbow 18 ft. X
(
)
=
ft.
5" round
_l
to 31/4" x 10"
transition
3 ft.
x
(
)=
ft.
6" round
to 31/4"x 10"
transition
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
downdraSt
cooktop.
I" 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.
32
Equivalent
Number
Equivalent
Duct Pieces
Length* x
Used
=
Length
5" round
to 31/4"x10"
transition
90° elbow
37 ft.
X
(
)
=
ft.
S" round
tO 31/4" X
10"
transition
90°elbow
20 ft.
X
(
)=
ft.
31/4" X
10"
to 6" round
transition
5 ft.
x
(
)
=
ft.
31/4.x10
,
to 6" round
transition
90°elbow
12 ft.
X
(
)=
ft.
Tapered
5" round
to 6" round
transition
ft.
5" round collar
to 6"
round
cap transition
ft.
5" round
wall
cap
(_
with damper
ft.
6" round
wall
cap
with damper
ft.
@
1/4"X10"
wall cap
with damper
ft.
_1_
6" round
roof cap
ft.
6" round
roof vent
6ft.
x(
)=
13ft.
x
(
)=
84 ft.
x
(
)
=
21ft.
x
(
)=
27ft.
x
(
)=
20
x(
)=
24
x
(
)=
Subtotal Column 2
=
Subtotal Column 1
=
TOTAL DUCTWORK
=
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.
Blower
is rated
at 400
CFM
at
0.1 inch
of water
back
pressure.