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Hello, Thank you for your question and for your interest in model #HMWB361WS. This unit is not designed to trigger a make-up air damper. Please note that local building codes may mandate the use of make-up air systems when operating ducted ventilation systems above a certain CFM threshold, which varies depending on the location. It is the responsibility of the homeowner and the installer to ensure compliance with any additional regulations or standards that may apply to specific installations.
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