BCA Permeability Calculator Inputs Building Predefined Enter Building Dimensions Building Volume (m3): Perimeter zone Volume (m3): Envelope area (m2): Length (m): Width (m): Floor to Floor height (m): Number of floors: Total design Exhaust (l/s): HVAC Free area (fresh air + spill air) (m2): Ambient indoor to outdoor pressure difference (pa): n (power coefficient): Indoor to outdoor pressure difference when HVAC in operation (pa): Results NCC 2016 Afterhours Air leakage estimation and permeability ACH refered value NCC 2016 (ACH): 1.5 Permeability @ 50pa ATTMA equivalent: 1 HVAC in operations Air leakage estimation and permeability ACH Perimeter zones refered value NCC 2016 (ACH): 1 Permeability @ 50pa ATTMA equivalent: 1 Afterhours Air leakage addition calculations for estimated permeability Total Leakage afterhours: 1 Afterhours leakage from exhaust: 1 Estimated Leakage from HVAC openings using EqLA method: 1 Estimated afterhours envelope leakage: 1 Permeability @ ambient: 1 HVAC in operations Air leakage addition calculations for estimated permeability Leakage during op: 1 Permeability @ operating pressure: 1 Simple Volume and envelope area calculator Building Volume: 1 Perimeter zone Volume: 1 Envelope area: 1 Perimeter zone to total volume ratio: 1 You Might Also Like... Air Permeability and Seeing the Unseen Energy Modelling and Building Air Leakage in Australia EM0017 – BCA and Air Tightness Air Leakage Unit Conversion
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