Used Flanders filters in my last home for many years. This time I think the 20x20 size is not strong enough. My device bends the filters easily and I'm afraid they'll end up in a hole I can't reach. Tried to pin but these filters are too big for such a thin cardboard frame. Flanders would suggest abandoning this photo frame style filter and going back to a cardboard frame on the sides to allow the filter to hold its shape.
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