LEAKAGE
Definition
Leakage is the percent of air that’s transferred from one air stream to another air stream.
OACF
Percentage leakage from outdoor air to exhaust air (from P1 to P4).
EATR
Percentage leakage from return air to supply air (from P3 to P2).
To ensure no leakage between the air-streams, pressure shall be higher in P1 (OA) than in P4 (EA) and higher in P2 (SA) than in P3 (RA).