Products Architectural Louvers, Dampers, Roof Curbs, Actuators, Grilles, Sunshades and more. Roof Curbs and Rails - Conventional Curbs: Model:UPP-4 Pipe Portal, 4 connections APPLICATION Conventional roof curb with vertical pipe flashing and cover; for use with pipe penetrations from 3/8" to 6" diameter. UPP-4 DOCUMENTS - Submittal Sheet Drop Plenum Diffusers Balancing / Regulating Dampers UV Products Iris Dampers Louvers Dampers UL Listed Dampers Roof Curbs and Rails Sunshades Architectural Grilles Ventilators Doors Actuators Fans Air Measuring Products VAV Terminals Security Bars & Grilles Plenums Duct Take-Offs Custom Work Manufacturer Cross Referencing System View Now Previous Next