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Winvall Special Price Four-Pipe Control Mechanical Temperature Controller Room Thermostat. Wide Application Scope: Suitable for commercial, industrial, and residential environments including flooring heating systems. Three Fan Speed Options: Features three adjustable fan speeds for precise temperature control. OEM/ODM Services: Company offers full OEM and ODM customization services for clients. ISO9001 & CE Certified: Products meet international quality standards with ISO9001 and CE certifications. Durable Material Construction: Constructed with milky PC plastic for the shell and cover. Flexible Installation: Can be installed in wall or terminal box with manual control switch.