Dayton 5EFJ3 Roof Curb, Fixed, 12 in H, 50 1/2 in O D OCD8_L8DZQ55

This prefabricated, straight-sided roof curb is leakproof and provides compatibility between ventilator, curb, and roof opening on commercial and industrial buildings. Ideal for flat, nonisulated roof decks with think or rigid roofing material. For flat roof decks with up to 6 of insulation. Roll-formed with 18-ga. galvanized steel and 1 welded side for added strength.