Ive been using filters from FilterBuy for several years. This week my HVAC systems were serviced and I asked the tech to check my AC coil and he said they were very clean. Ive switched to the merv8 from the merv11 since we dont have allergy issues.
My vent opening was exactly 8x24, but the filter was ever so slightly bigger, so the filter did not fit as easily as I expected. Otherwise, happy with the product.