18x20x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 19.75) - 3 Pack Merv 8 4" X 12" Is The

4" X 12" Is The Size For The Duct Opening Measurement Only

In the past

+ Product Details Size & Compatibility – The size of the side round ceiling box is 6" X 6" X 4" and it is compatible with duct 4"

Tubing - Blade does not bend or break and has ratchets for cutting precision and ease of use

18x20x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 17.75 x 19.75) - 3 Pack Merv 8 4" X 12" Is The+ Product Details 18" x 20" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 17. 75" x 19. 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