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Table 1: Energy air leakage requirements for a model building.
5000 m² building @ 20 m³/h/m² at 50 Pa
Maximum natural air change rate	0·55 ac/h
Estimated annual air leakage requirement	111 725 kWh/annum
5000 m² building @ 5 m³/h/m² at 50 Pa
Maximum natural air change rate	0·13 ac/h
Estimated annual air leakage requirement	27 932 kWh/annum
Difference	83 793 kWh/annum