Chimneys and Similar Openings
Chimneys and chimney-adjacent openings are among the building features bats can use to enter or access structures.
Sounds originating around a chimney are not species-diagnostic because other animals can use the same structural area.
Bat Activity and Pennsylvania Timing
Bat presence should be confirmed through additional signs or entry/exit observation.
Pennsylvania Game Commission guidance identifies Pennsylvania's bat maternity season as May 15 through August 1. Pennsylvania Game Commission guidance states that bat exclusions should not be performed during the May 15 through August 1 period.
Pennsylvania Game Commission guidance warns against sealing active bat exit points during winter where bats may be overwintering. Winter one-way work requires timing that allows bats to leave when regular spring activity resumes.
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