3 In. Thick Series 24 In. X 8 In. X 3 In. Hopper Vent for Glass Block Windows (A
Thick Series 24 In. Hopper Vent for Glass Block Windows (Actual 23.25 In. X 7.75 In. X 3.12 In.). Removable screen and frosted glass The Clearly Secure 3 in. Thick Series Glass Block Hopper-style vent is designed to work with 3 in.