Item Detail Table of Content Exhaust Extraction Exhaust, Above Ground Standard Overhead Exhaust Removal System Item Number: HRVOH-30-47 Price: $618.20* * log in for dealer pricing. Direct from 3rd Party Supplier Add To Cart Description Standard overhead exhaust removal system. Includes HRVHF-477 Rubber tailpipe adaptor 20' x 3" neoprene rubber hose Overhead duct coupler Energy saving damper Warranty One year.