HVAC engineers

Understanding the Air Handling Unit (AHU) – Step-by-Step Air Treatment Process Step 1 - Air Inlet Section Outdoor fresh air enters the AHU through the air inlet and dampers. Dampers regulate the quantity of fresh air entering the system according to ventilation requirements and pressure control strategy. Step 2 - Pre-Filter Section The incoming air first passes through the pre-filter where large dust particles, fibers, and airborne contaminants are removed. This stage protects downstream components and improves equipment life. Step 3 -Fine Filter Section After pre-filtration, air moves through the fine filter section which removes smaller particulate matter and improves indoor air quality (IAQ) as per HVAC and ASHRAE filtration standards. Step 4 - Cooling Coil Section The filtered air then passes across the cooling coil where sensible heat and latent heat are removed. This process cools and dehumidifies the air to achieve the required supply air conditions. Step 5- Heating Coil Section...