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fDesc[0] = "Ultra-Calc™ allows distributors and contractors to calculate the material required for installation of McDuffco's Radiant Floor heating system. Forced air radiant floor heating systems use an oil, gas or electric furnace to heat air which simply gets blown throughout the house via ducting. Occupants of the home experience “warmth” by coming into contact with the warm air. Radiant heat is different in that it does not heat the air, but heats the objects in the room (such as people) with invisible infrared radiant energy.";

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