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Amazon.com: HSIAMEN Replacement Filter Compatible with Tenergy Renair, Cool-Living CL-6070A, Beaba, Tredy TD-1300, 3-in-1 H13 True HEPA Filters, White 2-Pack : Home & Kitchen
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Amazon.com : Aquabarrel Downspout Filter 2x3 Downspout | Best Downspout Filter | Enclosed Gutter Filter (White) : Tools & Home Improvement
![Went to change my furnace filter, only to see this white powder-like substance all over the inside. It seems to be coming from the intake. Any idea what it is? : r/hvacadvice Went to change my furnace filter, only to see this white powder-like substance all over the inside. It seems to be coming from the intake. Any idea what it is? : r/hvacadvice](https://preview.redd.it/rv5ppqbyeu871.jpg?auto=webp&s=5dc44bfba30711291a9b054213ee4ba9053b487b)