Air Handling Unit is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system. Standard modular series are offered in preset dimensions through a series of 24 sizes to cater for airflow range of 1190 CMH to 70500 CMH ( 700 CFM to 41500 CFM ) and a total static pressure range of up to 1500 Pa ( 6” WG ).