Door curtains for condensing boilers

Biddle Air Curtains has developed a door curtain using lower water temperatures, such as those available from condensing boilers. The Invisidor City CB has a heater/battery/coil with a large surface area to improve heat transfer. They can provide up to 18 kW of heating. There are six sizes in four casing styles to suit door heights up to 3.2 m.
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