Products / Square Roof Curb

Active Ventilation Products' Square Roof Curb is a non-insulated aluminum mounting base for roof vents and fans (or as a hatch curb for ductwork and HVAC access) on flat or low-slope membrane roofs, sold across 60 SKUs in heights of 6, 8, 12 and 18 in., outer dimensions from 6x6 to 51x51 in., and interior openings from 5 to 49 in. to fit 3 to 48 in. diameter vents and fans. AVP says the curbs are installed for EPDM, PVC and TPO roof membranes. The 12 in. model page (SRC-12-H6) prints an aluminum alloy 3003-H14 construction at 0.040 in. (+/- 0.005 in.) thickness and says the product "carries UL Certification," without naming a specific UL standard number next to that statement, so no fire_rating, impact_class or standards_met is drawn from it. Optional insulation and aluminum caps are sold separately for curbs with no vent installed. No product-specific warranty document was found on AVP's warranties page for this line.