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Hi VENT, thanks for your question and interest in model DPH36652UC. A 600 CFM centrifugal integrated blower is included with this model. Proper performance is dependent upon proper ducting. Use a qualified and trained installer. Local building codes may require the use of makeup air systems when using ducted ventilation systems greater than specified CFM of air movement. The specified CFM varies from locale to locale. Consult your HVAC professional for specific requirements in your area.
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