Gibraltar Building Products 16 in. x 6 in. Plastic Block Vent with Damper

Gibraltar Building Products plastic foundation block vents are used and designed for poured concrete walls. Long lasting gray plastic injected mold vents provide necessary air flow for a home's foundation or crawlspace. These provide 72-1/2 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.6 in. poured-in-place wall sizeDual cavity designHelps reduce utility billsUses foam plugs to insulate in the winterCalifornia residentssee Prop 65 WARNINGS