24x24x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 23.75 x 23.75) - 3 Pack Compatible With Duct 12in Design – The stick-on side

Design – The stick-on side take-off duct is designed to connect a square duct to a round duct

+ Product Details Size – 4"h X 14"h is the size for the duct opening measurement only

+ Product Details 16"w X 16"h is the size for the drywall opening measurement only

actual front end outer dimensions are approximately 21" width X 21" height -

It also has a lock catch built in for your convenience

24x24x1 MERV 2 Non Pleated Air Filter Replacement Filters (Actual Size 23.75 x 23.75) - 3 Pack Compatible With Duct 12in Design – The stick-on side+ Product Details 24" x 24" x 1" replacement air filters for your furnace, air conditioner, heat pump, or HVAC system (actual size: 23. 75" x 23. 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