An Energy Recovery Ventilator (ERV) is a type of ventilation system that:
 
1. Exchanges stale indoor air with fresh outdoor air
2. Recovers energy (heat, humidity, or cooling) from the exhaust air
3. Transfers it to the incoming fresh air, minimizing energy losses
 
ERV systems improve indoor air quality, reduce energy consumption, and help maintain a healthy environment.
 
Required annual services for ERV systems typically include:
 
1. Filter replacements (pre-filters, core filters, and post-filters)
2. Cleaning of the energy recovery core and components
3. Inspection and cleaning of fans and motors
4. Check and adjustment of airflow rates and balances
5. Verification of system controls and sensors
6. Cleaning of the exterior and interior cabinets
7. Check for any signs of wear, damage, or corrosion
 
Regular annual maintenance ensures optimal performance, efficiency, and extends the lifespan of the ERV system. It's recommended to follow the manufacturer's guidelines and schedule annual services with a qualified technician.