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Bats in basement coming through chimney

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Steve says: 
I have a problem with bats in my basement and back entry/ mudroom. The only place i can see that they would be getting in is down the chimney, only my water heater is venting out the chimney and to try and control the bat problem I want to put some window screen in the vent pipe to stop them. My question being is it safe to do this or will it restrict airflow too much to allow proper ventilation?
asked in House Chimney by darekrudy (21,730 points)
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1 Answer

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Hi Steve,
Do not put any window type screen inside the vent pipe – it is not designed for this purpose and it will significantly cut down the chimney drafting capacity. Over time, small screen can become clogged with burning process deposits and dust – it’s dangerous. Instead, install a listed / approved for this purpose screen on top of the chimney.
There are various types of those chimney screens, some are integrated into the chimney cap, others can be added around the existing cap. Just search for “chimney cap”, or “chimney screen” in your browser. If you have a tall, unsupported, hard to access chimney, do not lean the ladder against it!
answered by darekrudy (21,730 points)