Exhaust treatment in HVAC system

There are four types of exhaust usually encountered in HVAC systems. Different types of exhaust require different types of treatment.
1. Heat exhauste –> discharge direcly to ambient.
2. Dust exhaust –> treated by dust collector.
3. Toxic exhaust –> treated by scrubber.
4. Bioharzard exhaust –> treated by HEPA filter.