Safe laboratory ventilation begins with the building structure. Aveltra divides exhaust and make-up air systems according to nearby shafts, keeps duct routes short and direct, and balances exhaust with make-up air to keep rooms under controlled negative pressure.
Typical design targets include branch duct velocity of 6-8 m/s, main duct velocity of 8-14 m/s, 8-12 air changes per hour for general chemical laboratories, and terminal noise no higher than 62 dB.