Gibraltar Building Products 16 in. x 8 in. Plastic Block Vent with Damper

Gibraltar Building Products Deluxe Vent-Air style foundation block vents are used and designed for pour in walls. Long lasting gray plastic injected mold vents provide necessary air flow for a home's foundation or crawlspace. These provide 73 sq. in. of net free area. Manually operated damper doors allow for maximum air flow in the warmer months and can be closed to prevent unwanted cold air and moisture in the winter.Designed for 8 in. poured-in-place wall sizeDual cavity designHelps reduce utility billsUses foam plugs to insulate in the winterCalifornia residentssee Prop 65 WARNINGS