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https://www.thenowair.com/blog/how-does-a-heat-recovery-ventilator-work.html

Thenow Smart Super Air system is the integration of various isolated healthy breathing products. It`s the real indoor air master. It can sense the IAQ, then analyze it, finally do adjustment to reach a comfortable level – constant purification, constant fresh air, constant humidity, constant temperature at its lower cost and noise.

How does a heat recovery ventilator work
1. 2 fans are installed
2. One fan draws the warm, stale and polluted air from the dwelling areas of your domestic through the HRV system to be launched outside.
3. The 2d fan attracts a continuous stream of cool sparkling air in through the device to be distributed during your home.
4. As the warm air being expelled moves via the HRV device and passes the cool clean air being drawn in, warmness is transferred from the outgoing stale air to the incoming sparkling air.