I like the idea of this product, but don't see how it can work with the design of my air filters. I have several cats, and am never sure when is the right time to change my furnace air filter. So, I ordered this product, thinking it would give me a better idea of when to do that. The filter I currently have installed, and a couple of others I have on reserve, all have wire honeycombed throughout the filter, and I cannot attach the whistle. I don't buy the cheapest filters, more like the mid-range-priced ones, so maybe the cheaper ones don't have the wire in them and so would allow me to attach the Air Filter Furnace Whistle. I'll report back after I have checked out other kinds of filters.
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