“The Air Boot™ model CAS-2A is for use only on the designated burner(s) as described in these instructions only when the specific burner includes this Air Boot™ when shipped from the burner manufacturer or where the burner instructions specifically reference the models CAS-2A Air Boot™ as an optional air intake system.” ITEMS INCLUDED IN KIT: 1 - Air Boot™ 1 - 4” VRV 1 - 4” IAH Hood 1 - Burner Coupling Set 2 - Mounting Bolts INSTALLER SUPPLIED ITEMS: Duct Piping and Elbows 90° Elbows; . “ NPT Fe