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  PHIUS Intermittent Kitchen Exhaust Allowance Calculator_v1  
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Total Building Envelope Area (ft2)
Air-tightness Allowance (CFM50/ft2)
Total Allowance (CFM50)
Flow Exponent from Air-Tightness Test
Conversion CFM50 > CFM5
Allowance Exhaust (CFM5)
Single Family or Multi-Family
Total # Residential Units
Local Exhaust Rate (CFM / Unit)
Total Potential Exhaust (CFM)
12% of Total Potential Exhaust (CFM)
Max Hour Exhaust Below Acceptable Allowance?
Max Hour Exhaust Below Acceptable Allowance?
       
 
 
  See corresponding Tech Corner article for details
  https://www.phius.org/software-resources/tech-corner/tech-committee-articles