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WebJan 25, 2024 · Use the Proper Roof Curb Type: It is not uncommon for a roofer to choose a curb type referred to an an “over/over” curb, meaning that, after the opening is cut, the curb is installed over the roofing on both the upslope and the downslope sides. WebFan and ventilator products for commercial, institutional and industrial roof installations. Select from a wide range of fan and ventilator products for commercial, institutional and … WebCurb Extensions Extensions raise the fan discharge above the roof line or provide an accessible mounting location for dampers. Aluminum Birdscreen 1/2 inch square aluminum wire mesh protects the fan’s discharge from birds or small objects. Speed Controllers Available for providing an economical means of system balancing with direct drive fans. dick clark branson