i want to add to all the above , you have to check what is the air outlet?.....i saw jet nozzles having 200 Pa Pressure drop!
i suggest if you feature all the duct accessories you have from the AHU discharge up to the air outlet.
regards,
Sherif Abulfetuh
Actually car park ventilation & Smoke extraction work in three modes:
1-Normal ventilation (normally at 3 ACH (Air change Per Hour)
2-CO detection (fans will jump to do 6 ACH)
3-Smoke/Fire detection (Fans will work at max. speed to do 10 ACH).
ideally the selection of the fans should be done...