The Reznor UDX45 Power Vented Gas Fired Unit Heater is a high performance heater designed for use in commercial and industrial applications. This unit features a vented design that allows for increased air flow and improved heat distribution. The Reznor UDX45 also features a high efficiency burner that provides superior heat output. The Reznor UDX45 Power Vented Gas Fired Unit Heater is a high performance heater designed for use in commercial and industrial applications. This unit features a vented design that allows for increased air flow and improved heat distribution. The Reznor UDX45 also features a high efficiency burner that provides superior heat output.