Superior Outside Air Kit Collar, Hood and 3' Flex Pipe for Floor Venting AK4FOutside Air Kit Collar, Hood, and 3' Flex Pipe Superior for Floor Venting AK4F Product Details Installation of an outside air kit should be performed during the rough framing of the fireplace due to the nature of its location. Outside combustion air is accessed through a vented crawl space (AK4F) or a sidewall (AK4). What's Included: Outside Air Kit Collar Hood 3' Flex Pipe Features: Complete outside air kit Kit to draw outside air through a