The product came through as promised and in good shape but they are so noisy when the furnace is running. You should make people aware of that and recommend a different filter if they are looking for quiet. The old filters werevery quiet, I wish I wouldn't have ordered extra filters and ordered a different filter. Sincerely Howard Koelle
I use these filters in the ceiling return air if my air conditioning system. The filters are hard to get into the grooves that hold the filter unless I bend all sides of the cardboard in the middle, so that I can flex the filter enough to fit into the containment groves. When I do this, it creates a sloppy fit and I know some air escapes around the perimeter of the filter. Suggestions are welcomed. .