GE PV970NSS - Manual (Page 10)

10
49-80549-2
DUCT FITTINGS
This Hood Must Use an 8”
Round Duct. It Can Transition
WRDµ[µ'XFW
Use this chart to compute
PD[LPXPSHUPLVVLEOHOHQJWKVIRU
duct runs to outdoors.
NOTE:'RQRWH[FHHGPD[LPXP
permissible equivalent lengths!
Maximum duct length:
100 feet.
Flexible ducting:
,IIOH[LEOHPHWDOGXFWLQJLVXVHG
all the equivalent feet values
in the table should be doubled.
7KHIOH[LEOHPHWDOGXFWVKRXOG
be straight and smooth and
H[WHQGHGDVPXFKDVSRVVLEOH
'2127XVHIOH[LEOHSODVWLF
ducting.
NOTE: Any home ventilation
system, 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 naturally vented
systems. To minimize the chance
of interruption of such naturally
vented systems, follow the
heating equipment manufacturer’s
guidelines and safety standards
such as those published by NFPA
and ASHRAE. When applicable,
install any makeup (replacement)
air system in accordance with
local building code requirements.
Visit GEAppliances.com for
available makeup air solutions.
Installation Preparation
* 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
Equivalent Quantity Equivalent
Duct Piece Dimensions Length* Used Length
8” Round, 1 ft.
straight (per foot
length)
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straight (per foot
length)
8” 90° elbow
17 ft.
8” 45° elbow
10 ft.
 øµ[µ
90° elbow 43 ft.
 µ[µ
45° elbow 26 ft.
 µ[µ
90° flat elbow 102 ft.
8” round to
 µ[µWUDQVLWLRQ IW
 µ[µWRµ
round transition 5 ft.
8” round
 WRµ[µ
transition 90° elbow 6 ft.
 µ[µWRµURXQG
round transition 90° elbow 13 ft.
8” Round
wall cap
with damper 32 ft.
 µ[µZDOOFDS
with damper 75 ft.
8” Round
roof cap 44 ft.
Round
roof vent 24 ft.
Total Duct Run