Static Pressure Limit Static Pressure Limit If the product of the temperature differential across the building envelope (ΔT), multiplied by the building height (m) is greater than 250 m·°C, it is likely that the stack pressure is too great to maintain an equal pressure difference across the whole of the building envelope. Indoor Temperature: Outdoor Temperature: Building Height(m): Results Static Pressures Factor (ΔT*h): 1 ATTMA Static Pressure Limit is 250 You Might Also Like... BCA Permeability Calculator Pressure Flow Conversion Calculator How can air leakage testing help you? AS NZS ISO 9972:2015