Annex F - Wind Load Test
The closed roof light is loaded with 1500 Pascal for 10 minutes and must not show failure, the system passed and can therefore a claim of WL1500 can be made against the available classifications WL1500, WL3000 or WLA.
The designations 1500, 3000 and A represent the test wind suction load in Pa.
The vent must also reach its fire open position within 60s with wind load appropriate to its classification.