12x18x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 11.75 x 17.75) - 3 Pack 16in diameter All of these grills have

All of these grills have dampers

1mm PVC coating make these vent covers a top choice for sidewall

+ Product Details Size - 32"W X 6"H is (for duct opening measurement only)

+ Product Details Size - 24"w X 30"h is the size for the duct opening measurement only

This aluminum adjustable louvered garage vent allows air ventilation and circulation in your garage 24 hours a day

12x18x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 11.75 x 17.75) - 3 Pack 16in diameter All of these grills have+ Product Details 12" x 18" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 11. 75" x 17. 75") A unique combination of cotton & synthetic fibers gives you the most filtration and the least air resistance equals great air & easy airflow for your system. The non pleated design provides low airflow resistance while still effectively capturing dirt and particles such as standing dust, spray paint