What are the sources of noise in ventilation system?

There are many sources of noise in the ventilation system, such as the sound generated by the rotation of the host's motor, the sound generated by improper connection between the host and the distributor or pipe, the sound generated by the friction between the wind and the inner wall of the air duct, the sound generated by the filter being clogged, the use of lintels, etc. The sound caused by unreasonable diameter change; at the same time, debris entering the motor or system will also cause noise.

Does the heat exchange core of the ventilator need to be replaced? If so, how often should it be replaced?

need. Generally speaking, the heat exchange core of the ventilation system is divided into sensible heat and total heat. The sensible heat exchange core is generally made of aluminum foil and can be cleaned, but the efficiency will drop a lot after cleaning. The full heat exchange core is generally made of paper and can be cleaned. , but it will also drop after cleaning. It is recommended to clean it once a year or so and replace it every 2-3 years.