Zephyr ALL-M90BBX Installation And Use Instructions Manual page 2

INSTALLING THE DUCTWORK:
INTERNAL BLOWER
NOTE: To reduce the risk of fire, use only
metal ductwork.
1. Decide where the ductwork will run
between the hood and the outside.
2. A straight, short duct run using a minimum
6" round duct will allow the hood to perform
most efficiently.
3. Long duct runs, elbows, and transitions will
reduce the performance of the hood. Use
as few of them as possible.
4. Install a roof cap. Connect round metal
ductwork to cap and work back towards
hood location. Use duct tape to seal the
joints between ductwork sections (Fig.7).
DUCT COVER
HOOD
24" MINIMUM
ABOVE COOKING
SURFACE
- 16 -
ROOF CAP
6" ROUND DUCT
FIG. 7