14x25x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 13.75 x 24.75) - 3 Pack Compatible With Duct 5in actual front end outer dimensions

actual front end outer dimensions are 6" diameter

+ Product Details Size – 36"w X 18"h is the size for the duct opening measurement only

And The Cooler Air From Outside WIll Flow In From The Bottom

Simplified Installation: Our Butterfly Damper ensures easy setup

14x25x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 13.75 x 24.75) - 3 Pack Compatible With Duct 5in actual front end outer dimensions+ Product Details 14" x 25" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 13. 75" x 24. 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