Constructed from foam, lightweight and easy to install or replace seasonally, includes a pair of pre-attached vent plugs, help reduce utility bills, designed to fit snugly within the cavities of Lawrence (Sku # 810-4903), Vent-Air (Sku # 810-4911) and Norwesco (Sku # 117-0182) design block vents (not included).
| Material | : | Foam |
| Suitable for | : | Lawrence, Vent-Air, Norwesco Vents |
| Dimensions | : | 6-1/2 in W x 7-3/4 in H |