house exhaust

House exhaust provides general ventilation for non-hazardous air from cleanroom and fab support spaces. **Purpose**: Remove heat, general odors, and non-hazardous air from equipment areas, utility spaces, and cleanroom return air. **Contrast with process exhaust**: Not designed for toxic or corrosive gases - those need dedicated exhaust systems (acid, solvent, toxic gas). **Sources**: Heat from equipment, general building ventilation, cleanroom air return not recirculated, office and break room exhaust. **Materials**: Standard galvanized steel or aluminum ductwork acceptable since air is non-corrosive. **Volume**: Large airflow volume - significant portion of fab HVAC capacity. **Energy recovery**: Heat exchangers may recover energy from exhaust to pre-condition makeup air. **Filtration**: Not typically filtered on exhaust side unless specific contamination concern. **Discharge**: Rooftop stacks, positioned away from fresh air intakes. **Monitoring**: Basic airflow monitoring, less stringent than hazardous exhaust. **Integration**: Connected to building automation system for airflow balancing and energy management.