Furnace filter question

Old 03-01-10, 11:07 AM
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Furnace filter question

Good afternoon,
Where my furnace filter goes in my furnace I have a 1/4 inch gap on both sides.
See when we had the furnace installed back in 99 it came with a life time filter having said that about three years latter we were told not to use it for what reason I don't know by the same company who installed the furnace.
What my concern is that dust or whatever can be entering the furnace ahead of the filter!.
Is there anything I can put on the lip of the duct that will fill this gap & is this a concern?
Thank you!
Old 03-01-10, 12:05 PM
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yes, having a gap on the side on the filter makes it practically worth less, buy a longer filter or find a way to seal it
Old 03-01-10, 12:24 PM
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You can seal up the gap with pretty much anything you like.

Is there a tendency for the filter to get sucked in by the force of the airflow? If so, you might consider making a wood, plastic or sheetmetal frame for the filter to sit on which would close the gap and support it as well.

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