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Hello, Some local codes limit the maximum amount of CFM a range hood can move. ACT™ allows you to control the maximum blower CFM of select Zephyr Ventilation range hoods without the need for expensive make up air kits. ACT™ enables the installer to easily set the maximum blower speed to one of two most commonly specified CFM levels; 390 or 290 CFM. The duct cover is 10-3/8”. The mounting height range is 24” - 34”. Thank you for your inquiry! -Zephyr
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