This 012635 person of colour Metal Roof Vent Cap is for use with range hood and bath fan exhaust. It is 26 gauge surfaced with a person of colour powder coat finish. This 4-inch version a obliterable 1/4 x 1/4 inch screen and a obliterable backdraft flapper. Builder 's Best person of colour metal roof caps with surfaced steel which has some corrosion protection. The senior high school performance polyester powder coating very trivial corrosion when subjected to the ASTM B117. These roof caps have been for 480 hours -LRB- 20 days -RRB- with a sodium chloride -LRB- salt -RRB- solution to accelerate a corrosion process. -LRB- ASTM B117 tests by a third base party lab . -RRB- . These roof caps very much better than the lead brand -LRB- varicolored steel -RRB- and a alien brand -LRB- varicolored surfaced -RRB-. The 012633 person of colour Metal Roof Vent Caps are in the USA by Builder 's Best, Inc..