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I am considering tacking wire mesh (such as from a window screen) onto the inside of my indoor furnace/AC duct vents as well as the outdoor intake vents, for pest control. I know doing it inside the house might be a little overkill, but I'm wondering if there would be any side effects on furnace/AC performance due to the fans having to work harder to force the air through.

  • Identifying what kind of pest problem you're having may get you better solutions to the actual problem instead of suggestions that your band-aid solution isn't a good idea. – FreeMan May 28 at 11:27
  • what is an outdoor intake vent? - is that a real thing on houses? – dandavis May 28 at 19:14
  • @dandavis good question. I guess technically they are not outdoor but in a loosely sealed three-season room where bugs seem to get in to. – martieva Jun 1 at 15:38
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Typical screening can reduce airflow about 50 to 70%. This could destroy the efficiency of your AC and heating units and possibly burn out the fan. Placing any type of screen on intake or exhaust of your furnace could cause it to shut down as it thinks there is a blockage in the venting. Your furnace /AC unit already has a filter on the intake side of the fan so you wouldn't need screening on the individual vents in the rooms.

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By "pest control" do you mean insects or rodents? Larger mesh, also called "hardware cloth" would not significantly impede airflow and will stop rodents. Window screening will clog with dust and cause you nothing but problems. If you were thinking window screen to prevent insects, you need no worry about them entering from the outside that way. To get through the ducts and into your house, they would ahve to get through your air filter.

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  • Insects. And thanks, I appreciate the answer. – martieva Jun 1 at 15:35

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