Installation Preparation - GE Profile PV976 Owner's Manual And Installation Instructions

Installation Preparation
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:
i00 feet.
Flexible d ucting:
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,
mag interrupt the proper flow
of combustion air and exhaust
required bg fireplaces, gas
furnaces, gas water heaters and
other naturallg vented sgstems.
To minimize the chance of
interruption of such naturallg
vented sgstems, follow the
heating equipment manufacturer's
guidelines and safetg standards
such as those published bg NFPA
and ASHRAE.
Equivalent
Duct Piece Dimensions Length*
8" Round, 1 ft.
straight (per foot
length)
3-1/4" x 12" i ft.
straight (per foot
length)
8" 90 ° elbow
17 ft.
8" 45 ° elbow 10 ft.
3-1/4" x 12" 90 ° elbow 43 ft.
3-!/4" x 12"
45 ° elbow 26 ft.
Total
Quantitg Equivalent
Used Length
3-!/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 7"
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
round transition 90 ° elbow 13 ft.
8" Round
wall cap
with damper
3-!/4" x 12" wall cap
with damper
52 ft.
75 ft.
(:_ 8" Round roof cap
44 ft.
Round
roof vent
24 ft.
*Actual length of straight duct plus duct fitting
equivalent. Equivalent length of duct pieces are
based on actual tests conducted bg GE Evaluation
Engineering and reflect requirements for good
venting performance with ang ventilation hood.
Total Duct Run
10