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Bypass Valve Structure of Total Heat Exchanger

Fan Quick-release Structure

Inspection Door Structure of Unidirectional-flow Fresh Air Ventilator

Unidirectional-flow Indoor/Outdoor Air Circulation Unit

Ball Valve Structure of Unidirectional-flow Wall-mounted Fresh Air Ventilator

Total Heat Exchanger with Bypass Valve Structure

Wall-mounted Fresh Air Ventilator with Single-hole Dual-air-duct Structure