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

featuring a mud and flange installation design

+ Product Details Size – 16" x 30" or 30" x 16" is the size for the duct opening measurement only

Looks like it was just waxed

+ Product Details Size - 16"w X 34"h is the size for the duct opening measurement only

14x28x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 13.75 x 27.75) - 3 Pack Compatible With Duct 7in featuring a mud and flange+ 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