I have a two story 115,000 ft2 garage, that in the design has both supply and exhaust fans to maintain a pressure neutral design. I am submitting an exceptional calculation method for garage exhaust fan DCV, but am concerned that I will be required to model 0.3 W/CFM in the baseline, which is essentially only an exhaust fan allowance. Only having exhaust fans is not an option in the proposed, as the garage does not have sufficient outdoor air infiltration or ventilation capabilities without sufficient supply air in addition to exhaust air. Will a fan power allowance exception be made if the ECM narrative explains this?
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