Open & Closed Grey Foundation/Basement Vent 16" x 8" For ventilating crawl spaces and foundations Designed for stucco, vinyl, aluminum or wood Built-in J-channel to receive siding for neat installation Sliding design so you can open it in the summer and close it in the winter for optimal performance CSA Approved
Composition & Materials: Injection-molded polypropylene modified for impact and UV resistance Codes & Standards: CSA Overall Size: 16 1/2? x 9 1/4? (42cm x 23.5cm) Area of Ventilation: 32.6 sq. in 3/4?(1.9cm) flange hides cut edge of exterior finish Easy Installation Designed for vinyl, aluminum or wood siding, and stucco Can be closed in cold weather