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Glossary of Technical Terms - U

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“U” Factor: Thermal Conductivity

Ultraviolet: Invisible radiation waves with frequencies shorter than wave lengths of visible light and longer than X-ray

Underwriters Laboratories: Abv. UL. Underwriter’s laboratories, inc. maintain and operate laboratories for the examination and testing of devices

Unit Heater: A fan and motor, a heating element, and an enclosure hung from a ceiling or wall.

Unit Ventilator: A terminal unit in which a fan is used to mechanically circulate air over the heating coil

Urethane Foam: Type of insulation which is foamed in between inner and outer walls of display case


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