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