Dial 78318 Roof Jack 20 (MISSION 1975jb-4)

Dial 78318 Multi-Pitch Roof Jack Multi-Pitch™ adjustable roof jacks are ideal for the installation of all major brands of residential ducted down draft coolers. Rails are pre-installed to support an optional Max-Aire™ barometric damper. Roof jacks are flanged and adjustable for flat roofs and for roofs pitched up to 6/12. 3000 to 4500 CFM jacks have 17¾” discharge opening. 5500-7000 CFM jacks have a 19¾” discharge opening. Caution: Roof jacks are intended for use as air distribution plenums only and not as supports for coolers. Use cooler legs to support cooler weight. Fits All Residential Down Draft Coolers 28 Gauge Galvanized Sheet Metal Includes Slide-In “Winterizer” Damper