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Reznor UDX300 Power Vented Gas Unit Heater h21.563 Q: Can I install theOverview Reznor HVAC has 130 years of experience manufacturing a wide range of industry leading industrial and commercial HVAC products. Reznor built its reputation by providing reliable, high quality heating, ventilation and cooling systems. Since its founding in 1888, Reznor has remained at the forefront of HVAC technology. Reznor is a global leader thanks to its innovative, extended range of gas fired unit heaters, air handlers, condensers and