18x12x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 11.75) - 3 Pack Floor Grille Toe Space Design – Circular air supply

Design – Circular air supply valves - designed to be used in low and medium pressure ventilation air conditioning systems

+ Product Details Size - 28"W X 8"H is (for duct opening measurement only)

Slots Are Angled to Diversify The Airflow In 2 Way Direction - Great for Wall and Floor & ceiling Applications

+ Product Details Size & Compatibility – The size of galvanized sheet metal straight floor boot is 12" X 4" X 7"

This access door is renowned for its strength and resilience

18x12x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 11.75) - 3 Pack Floor Grille Toe Space Design – Circular air supply+ Product Details 18" x 12" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 17. 75" x 11. 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