The Dial 78317 18" Multi-Pitch Roof Jack with Damper is a highly-reliable, durable product from Dial. This adjustable roof jack is ideal for the installation of all major brands of residential ducted downdraft coolers. It's made with 28-gauge galvanized sheet metal, and it includes a slide-in "winterizer" damper. It's rails are preinstalled to support an optional Max Aire barometric damper. It's flanged and adjustable for flat roofs and for roofs pitched up to 6/12.
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.