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Bodvarr OP t1_j9w6vne wrote

Reply to comment by Tall_Kayak_Guy in Is this a scam? It seems pretty suspicious. by Bodvarr

I don't even know what that is haha

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Tall_Kayak_Guy t1_j9ykwhn wrote

It's a two piece plastic whistle that you pierce through your furnace filter. When the filter becomes clogged, it forces more air through the plastic piece and makes an annoying whistle noise (most likely at 2:00 AM!).

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