Williams Furnace 9A335 High Altitude Conversion Kit for 3509821 and 3509621A w51.375 500 Vent Type Direct Vent

500 Vent Type Direct Vent Ignition Type Millivolt Type of Gas Natural Gas Venting 4 x 6 5/8 Installation Freestanding Gas Inlet (Pipe) 3/8" Orifice 2

Model Roxborough B-Size Recommended Set Size 2 Style Traditional Technical Drawings and Dimensions

Available in five different lengths ranging from 40" (1016mm) to 120" (3048mm)

Brand Superior Fireplaces Catalog Number F4734 Series Model Dual-Burner Outdoor

Osburn 5" x 48" Insulated Flex Pipe for Fresh Air Intake Kit

Williams Furnace 9A335 High Altitude Conversion Kit for 3509821 and 3509621A w51.375 500 Vent Type Direct VentOverview Williams Comfort Products Made In America Since 1916! For over 100 years, Williams has designed and manufactured quality heating, ventilation, and air conditioning products for both the home and business. It all started in 1916, when Jesse Williams began building gas steam radiators in Los Angeles under the banner Williams Radiator Company. Williams commitment to quality was clear from the start, and the companys product line expanded over