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Pressure differential switch between cooker hood or top fan and house ventilation unit. The switch will electronically transfer the relay information to the air conditioner unit from the pressure difference between the indoor air and the hood's extractor tube, measured from the cooker hood or top fan output tube. Suitable for both internal and external motored cooker hoods. Includes installation instructions and accessories for installation: 2m pressure hose, two sensor pins, mounting screws. The suitability of the house air handling unit for the relay data should be checked from the machine manufacturer. Also suitable for a wide range of air pressure and flow control applications. Product information