We have a filling room,Area-12X14X10 FT, Inlet are 1200 CFM, Delivery and suction air ratio 1:1, we want to build 40 Pa air pressure in respect with production corridoor(Corridoor pressure is atmosphric pressure). What should be the delivery and suction air ratio to build up that presuure. Is there any formula to calculate build up pressure in side the room with respect with others room or corridoor.