Suburban Furnace Vent 520968 (SF Series) 4-1/2 to 7-1/2 Inch Compatibility: Suburban SF-20F/ SF-25F/ SF-30F/ SF-35F/ SF-42F Model Furnaces   Kit Includes: Intake Tube Vent Cap and Exhaust Tube Intake Extension Exhaust Extension Screw Pack Back Cabinet Features Limited 90 Day Warranty