The Reznor’s Model EXUB Explosion Resistant Heater Unit
For hazardous locations. Model EXUB explosion-proof unit heaters are designed for rugged industrial applications, especially in hazardous locations where there is always the possibility of explosion or fire due to the presence of flammable gases, vapors or dusts. A variety of mounting kits are available for field installation.

Features:
Color:
● Standard: red

Finish:
● Epoxy/polyester powder paint

Voltage:
● 208V, 240V, 480V, 600V, 1 or 3-phase

Construction:
● 14-gauge steel cabinet.
● Adjustable anodized aluminum louvers.
● Cast aluminum control and element enclosure lids NEMA Type 7 and 9 with O-ring.

Protection:
● High temperature pressure relief valve.
● Two high-limit temperature controls: one with automatic reset and one with manual reset.

Fan:
● Explosion-proof, thermally protected, permanently lubricated ball-bearing motor.
● 5 to 20 kW: 1/4 HP, 1725 rpm.
● 25 to 30 kW: 1/2 HP, 1725 rpm.

Heat Exchanger:
● High grade metal-sheathed elements fins with ethylene glycol/water solution.
● Long-life, low watt density.
● Evacuated and sealed, carbon steel tube core with 10 aluminum fins per inch.
● Division System – T3B 165 °C (329 °F).
● Zone System – T3 200 °C (392 °F).

Temperature Code:
● T3B 165 °C (329 °F). Class I and II

Control:
● 120V control (standard).
● Optional 24V control.
● Optional built-in thermostat.

Installation:
● Accessories available.

Warranty:
● 3-year warranty against defects.

Approved Locations:
● Class I, Divisions 1 & 2, Groups C & D.
● Class II, Divisions 1 & 2, Groups F & G.
● Temperature code T3B.
● Class I, Zones 1 & 2, Groups IIA & IIB, T3

Temperature Limitations:
● Ambient temperature: -45 °C to 40 °C (-49 °C to 104 °F).
● Maximum altitude ASL: 3048 m (10 000 ft.).