Zephyr Breeze II Use, Care And Installation Manual page 9

WARNING FIRE HAZARD
NEVER exhaust air or terminate duct work into spaces between walls, crawl spaces, ceiling, attics or garages.
All exhaust must be ducted to the outside.
Use metal ductwork only.
Fasten all connections with sheet metal screws and tape all joints with certified Silver Tape or Duct Tape.
Some Ducting Options
Roof Pitch w/
Flashing & Cap
Air Recirculating
Rear Ducting
3-1/4"x10"
vertical ducting
7
3-1/4"x10"
horizontal ducting