Duct Fittings - GE ZVC36L2SS Installation Instructions Manual

Advance Planning
DUCT FITTINGS
Use this chart to compute
maximum permissible lengths
for duct runs to outdoors.
NOTE: Do not exceed maximum
permissible equivalent lengths!
Maximum duct length:
100 foot for range hoods.
Flexible ducting:
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.
NOTE: Ang home ventilation
sgstem, such as a ventilation hood,
may interrupt the proper flow of
combustion air and exhaust
required by fireplaces, gas
furnaces, gas water heaters and
other naturallbl vented Sblstems.
To minimize the chance of
interruption of such naturallbl
vented sgstems, follow the
heating equipment manufacturer's
guidelines and safetbl standards
such as those published bbl NFPA
and ASHRAE.
Duct Piece Dimensions
Round,
straight
Equivalent
Length*
1ft.
(per foot
length)
3-1/4" x 12" 1 ft.
straight (per foot
length)
Quantity
Used
17 ft.
90 ° elbow
10 ft.
45 ° elbow
3-P'4" x 12"
90 ° elbow 43 ft.
3-1/4" x 12"
45 ° elbow 26 ft.
3-1/4" x 12"
90 ° flat elbow 102 ft.
8" round to 3-1/4" x 12" transition 2 ft.
__ 3-1/4" x 12" to 8"
round transition 5 ft.
8" round
to 3-1/4" x 12"
transition 90° elbow 6 ft.
3-1/4" x 12" to 8" round transition 90 ° elbow 13 ft.
Round
wall cap
with damper 32 ft.
3-1/4" x 12" wall cap
with damper 75 ft.
<_ Round
roof cap 44 ft.
*Actual length of straight duct plus duct fitting
equivalent. Equivalent length of duct pieces are
based on actual tests conducted by GE Evaluation
Engineering and reflect requirements for good
venting performance with any ventilation hood.
Total Duct Run
Total
Equivalent
Length
10