Good quality Wall Mounted Ventilation Fans - By-pass Function Fresh Air Filtration Systems – Holtop
Good quality Wall Mounted Ventilation Fans - By-pass Function Fresh Air Filtration Systems – Holtop Detail:
In the situation when it’s not suitable to introduce outdoor fresh air, by-pass function fresh air filtration systems can bypass the air in the room for indoor air purification only.
Single-way Fresh Air Filtration with Internal Recycle System
Product detail pictures:

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