Duct Fittings - GE ZV950 Installation Instructions Manual

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:
100 ft. 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 us much us possible.
Do NOT use flexible plastic ducting.
Note: Any home ventilation system, such as a
ventilation hood, may interrupt the proper flow
of combustion air and exhaust required by fire-
places, 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 NFPAand ASHRAE.
Equivalent
Duct Piece Dimensions Length*
Round, 2 ft.
straight (per foot
length)
i ft.
3-1/4" x 12" (per foot
straight length)
(_ 90 ° elbow 27 ft.
(_ 45 ° elbow 20 ft.
3-2/4" x 22"
90 ° elbow 43 ft.
3 2/4" x 22"
45 ° elbow 26 ft.
3-1/4" x 22"
90 ° fiat elbow 102 ft.
_1_, 8" round to
3:1/4" x 12" transition 2 ft.
_l_, 3:174" x 22"
to 8" round transition S ft.
_ 8" round
to 3 2/4" x 22"
transition 90 ° elbow 6 ft
[_ 3 2/4" x 22" to 8"
round transition 90 ° elbow 23 ft.
(_ Round
wall cap
with damper 32 ft.
[_ 3 2/4" x 22" wall cap
with damper 75 ft.
Quantity
Used
Total
Equivalent
Length
Round
roof ca p
44 ft.
*Actuallengthofstraightduct plusductfittingequivalent. E quiva-
lentlengthofduct pieces arebasedonactualtestsconducted
byGEEvaluation Engineering andreflect r equirements f or good
venting performance w ithanyventilation hood.
Total Duct Run