Explosion-Proof Duct Heaters Comparison Chart On Heatrex, Inc.

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	Explosion-Proof Duct Heaters Comparison Chart

Explosion-Proof Duct Heaters Comparison Chart

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Engineering developments at Heatrex have made electric duct heaters for hazardous locations readily available at affordable prices.

227 Series Explosion Proof Duct Heater:

CSA Approved for virtually all Class I and Class II, Division 1 and 2 hazardous gas or dusty atmospheres.
Ignition temperatures as low as 320°F (160°C).
Six standard sizes to fit a wide range of ducts.
Ratings up to 240 KW, 600 volts.

220 Series Explosion Proof Duct Heater:

CSA Approved for Class I, Division 2 locations where a hazardous gas is occasionally present.
Ignition temperatures as low as 392°F (200°C).
For ducts up to 240" (610 cm) wide by 120" (305 cm) high.
Ratings up to 1000 KW, 600 volts.

Custom:

Wider range of sizes than available in the other two designs.
Vertical airflow.
Ratings up to 750 KW, 600 volts.

Comparison Chart

Heater Type	Heater Information	KW and Control Range	Class and Division	NEC Ignition Temperature Code	Special Considerations
227 Series	For hazardous gas or dust atmospheres Fits ducts from 12"W x 12"H to 75"W to 35"H	Up to 240 KW Single stage or SCR Control	Class I, Divisions 1 and 2, Groups B, C and D Class II, Divisions 1 and 2, Groups E, F and G	T3C 320°F (160°C)	Fastest delivery of the three designs Available for outdoor or wet locations Corrosion resistant construction available Horizontal airflow only Not approved for shipboard use
220 Series	For Division 2 hazardous gases (hazard exists only occassionally)	Up to 1000 KW Multi-stage or SCR Control	Class I, Division 2, Groups C and D	T3 392°F (200°C)	Available for outdoor or wet locations May be less expensive than 227 Series For larger KW designs Horizontal airflow only Approved for shipboard use
Custom	Designed for each project Not FM or CSA Approved	Up to 750 KW Multi-stage or SCR Control	Class I, Divisions 1 and 2, Groups C and D Class II, Divisions 1 and 2, Groups E, F and G	T1 842°F (450°C) through T3B 329°F (165°C)	Horizontal or vertical airflow Slip-in or flanged mounting For ducts smaller than 12" x 12" Available for outdoor or wet locations