Zephyr Essentials ACT Tempest II AK7500BS 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.
Some Ducting Options
Roof Pitch w/
Flashing & Cap
Soffit or crawl space
Rear Ducting
7
Side wall cap
w/ gravity damper