Review on Enhanced HVAC Filtration with FilterBuy 20X25X1 Pleated Furnace Filters by Roger King

our Texas department The heat here gets the unit working frequently. A week after installing the first filter, the device began wheezing and thumping (a high-frequency sound was heard and investigated). The filter picked up some dust and a very small amount of cat hair, but not enough to clog it. We used a different filter with similar results. Whistling sound after 5 days. These filters don't let enough air through. The keyword here is "Filter". Air needs to pass, and they're too tight. We went to Walmart and bought 3M which we knew worked. The device sounds good. We can't use that.