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R403.5.9 Connection to Forced Air Circulation Systems
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When air ducts are directly connected to the forced air circulation system, the outdoor air shall be supplied directly to the forced air circulation system, or the exhaust air shall be drawn directly from the forced air circulation system, but not both. To meet the mechanical ventilation system requirements, the air duct shall be installed according to the manufacturer's installation instructions.
Exception: Both outdoor air and exhaust air may be connected to the forced air circulation system only if controls are installed to operate the forced air circulation system when the mechanical ventilation system is operating or other means are provided to prevent short circuiting of ventilation air in accordance with the manufacturer's recommendations.
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When air ducts are directly connected to the forced air circulation system, the outdoor air shall be supplied directly to the forced air circulation ...
Minnesota Energy Code 2015 > 4 [RE] Residential Energy Efficiency > R403 Systems > R403.5 Mechanical Ventilation (Mandatory) > R403.5.9 Connection to Forced Air Circulation Systems
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