Assertion: energy recovery ventilation system | /r/HasProperty | cleaned
Facets:
value: regularly
type: DEGREE
Source sentences:
text: In addition, energy recovery ventilation systems need to be cleaned regularly to prevent deterioration of ventilation rates and heat recovery, and to prevent mold and bacteria from forming on heat exchanger surfaces.
text: They need to be cleaned regularly to prevent deterioration of ventilation rates and heat recovery and to prevent mold and bacteria on heat exchanger surfaces.