Review on NaturalAire Pre Pleat Filter 1 Inch 12 Pack Filtration for HVAC Filtration by John Hall

My filters were 19.5 x 19.5 x 3/4 and there was a small 1/16 inch air gap on the outside after the filter was placed in the housing. One box I received was made in OK (USA) and the other was assembled in MEXICO. The MEXICO filters were stiffer and appeared to have slightly denser filter media. Ironically, the American made ones were of inferior quality in overall construction. the filters had creases that had come loose from the supports, and several edges had come loose from the perimeter. In a box I received at least half of the filters were damaged although the shipping box was fine. This tells me there is a quality control issue that needs to be addressed. Other manufacturers produce their filters closer to the actual printed dimensions. Looks like I'll stick with MMM.