14x28x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 13.75 x 27.75) - 3 Pack Compatible With Duct 7in and carpet fibers

and carpet fibers

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 32" OR 32" x 36" duct opening (measured at the opening)

extruded aluminum wide flange frame

Actual Filter Size – 25 3/4"w x 9 3/4" x 1"

Looks like it was just waxed

14x28x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 13.75 x 27.75) - 3 Pack Compatible With Duct 7in and carpet fibers+ Product Details 14" x 28" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 13. 75" x 27. 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