Ductwork; Duct Fittings - Monogram ZVB36 Installation Instructions Manual

Use this form to
Duct
compute maximum
Fittings
permissible lengths
for duct runs to
outdoors.
Note: Do not exceed
maximum permissible
equivalent lengths!
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.
Downdraft Vent
150' maximum
equivalent length
Note: Any home
ventilation system,
such as a cooktop with
a downdraft exhaust
mechanism, 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 inter-
ruption 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° flat elbow
6" round
to 3-1⁄4" x 10"
transition
3-1⁄4" x 10"
round to 6"
transition
6" round to
1
3 ⁄ " x 10"
4
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
6" round
roof vent
* Actual length of straight duct plus duct fitting
equivalent. Equivalent length of duct pieces are based
on actual tests conducted by GE Evaluation Engineer-
ing and reflect requirements for good venting
performance with any downdraft cooktop.
Downdraf t Vent Systems
Total
Equivalent Quantity Equivalent
Length* Used Length
1 ft.
(per foot
length)
1 ft.
(per foot
length)
15 ft.
9 ft.
16 ft.
5 ft.
18 ft.
7 ft.
5 ft.
20 ft.
12 ft.
21 ft.
27 ft.
20 ft.
24 ft.
Total Duct Run
13