Aluminum flanged construction, holds two 4-1/2” fans in 3 spaces Fan panels accommodate all standard 4-1/2” fans. 3 rackspaces (5-1/4”) high, they are made from 16-gauge flanged aluminum. Offered in a black textured powder coat finish. Fan panel holds two 4-1/2” fans in three rackspaces Aluminum flanged construction Black powder coat finish