Ductwork; Duct Fittings - Monogram ZVB36 Installation Instructions Manual

Use this form to com-
Duct
pute maximum permis-
Fittings
sible lengths for duct
runs to outdoors.
Use 3-1/4" x 10" duct.
It can transition to
Note: Do not exceed
6" round.
maximum permissible
equivalent lengths!
Flexible ducting:
If fl exible metal duct-
ing is used, all the
equivalent feet values
in the table should be
doubled. The fl exible
metal duct should be
straight and smooth
and extended as much
as possible.
Do NOT use fl exible
plastic ducting.
Downdraft Vent
150' maximum
equivalent length
Note: Any home
ventilation system,
such as a cooktop with
a downdraft exhaust
mechanism, may
interrupt the proper
fl ow of combustion air
and exhaust required
by fi replaces, 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.

Ductwork

Duct Piece Dimensions
6" round,
straight
3-1⁄4" x 10"
straight
6"
90° elbow
6"
45° elbow
3-1⁄4" x 10"
90° elbow
3-1⁄4" x 10"
45° elbow
3-1⁄4" x 10"
90° fl at elbow
6" round
to 3-1⁄4" x 10"
transition
3-1⁄4" x 10"
round to 6"
transition
6" round to
3-1⁄4" x 10"
transition
90° elbow
3-1⁄4" x 10" to 6"
round transition
90° elbow
6" round
wall cap
with damper
3-1⁄4" x 10"
wall cap
with damper
6" round
roof cap
* Actual length of straight duct plus duct fi tting
equivalent. Equivalent length of duct pieces are based
on actual tests conducted by GE Evaluation Engineering
and refl ect requirements for good venting performance
with any downdraft cooktop.
13
Total
Equivalent Quantity Equivalent
Length* Used Length
1 ft.
(per foot
length)
1 ft.
(per foot
length)
12 ft.
7 ft.
14 ft.
8 ft.
33 ft.
2 ft.
2 ft.
4 ft.
4 ft.
24 ft.
24 ft.
33 ft.
Total Duct Run