![Home Efficiency Modern High Efficiency Furnace Filter Icon In Thin Line Style Stock Illustration - Download Image Now - iStock Home Efficiency Modern High Efficiency Furnace Filter Icon In Thin Line Style Stock Illustration - Download Image Now - iStock](https://media.istockphoto.com/id/1198511564/vector/home-efficiency-modern-high-efficiency-furnace-filter-icon-in-thin-line-style.jpg?s=612x612&w=0&k=20&c=jTNlLxzbQtYTwXnsTwtH43y5dQ_j-EvdVx4g-RoP7d4=)
Home Efficiency Modern High Efficiency Furnace Filter Icon In Thin Line Style Stock Illustration - Download Image Now - iStock
![This filter turned dark like this over 2 days whereas it usually takes a month or so. Something to worry about? New filter for comparison. Thanks in advance. : r/hvacadvice This filter turned dark like this over 2 days whereas it usually takes a month or so. Something to worry about? New filter for comparison. Thanks in advance. : r/hvacadvice](https://i.redd.it/6gtsjqbxbke91.jpg)
This filter turned dark like this over 2 days whereas it usually takes a month or so. Something to worry about? New filter for comparison. Thanks in advance. : r/hvacadvice
![Why is my furnace filter black? — Total Temperature Control | Heating, Cooling, Plumbing, & Electrical Why is my furnace filter black? — Total Temperature Control | Heating, Cooling, Plumbing, & Electrical](https://images.squarespace-cdn.com/content/v1/6317dc07992eb318008f5be7/4d24e1db-b36b-47d8-b296-c31c6f9c0ec2/air+filter+colors.png)
Why is my furnace filter black? — Total Temperature Control | Heating, Cooling, Plumbing, & Electrical
![Uncovering the Reasons Your Furnace Filter is Black - Maple Air Inc. Maple Air | Heating | Air Conditioning | Heat Pumps | Air Quality Uncovering the Reasons Your Furnace Filter is Black - Maple Air Inc. Maple Air | Heating | Air Conditioning | Heat Pumps | Air Quality](https://manager.infoempire.us/lib/uploads/81/rk0Ds9D6V4.jpg)