Oil Igniter DURAFire®

  • Type of Oil Igniter DURAFire®
  • The inside of Oil Igniter DURAFire®

DURAFire® can be used as a Class 1, Class 2, or Class 3 igniter, depending on the burner capacity. The DURAFire® is easily installed as a retrofit into most burner types based on its size, capacity, and reliable operation.

The DURAFire® oil igniter consists of five major components: a guide tube, an atomizer/head assembly, an oil/air mixture transport tube, a spark rod, and a stainless steel diffuser for pilot stabilization. The guide tube houses the internals, which are attached to the head and easily removed from the guide tube for maintenance purposes by releasing a “V” band retainer, requiring no tools. Cooling/combustion airflow is directed down the guide tube to support and maintain the primary combustion zone during operation. This controlled mixture of fuel and air in the primary combustion zone results in a highly reliable, stable igniter flame. While out of service, airflow cools the igniter and prevents debris from entering the end of the guide tube.

The DURAFire® oil igniter comes standard with Forney’s High Energy Spark Igniter (HESI) as the spark source. The HESI produces a powerful 12-joule spark approximately three times per second at the primary combustion zone. The HESI spark tip is a nonfouling, surface-gap tip which is replaceable as a unit by a threaded connection. The remaining HESI components consist of a positioning rod, cable and power unit. Optional equipment for the DURAFire® includes mounting hardware, retraction assembly, hoses and flame detector.


Fuel: No. 2 oil
Capacity Rating*: 6-33 MBtu/hr (1.76-9.67 MW)
Atomization Media: Air
Fuel Pressure: 60 psig (4.22 kg/cm2) at igniter
Atomizing Air: Pressure: 80 psig (5.62 kg/cm2) at igniter
Flow: 0.40 lb air/1 lb fuel
Cooling / Combustion Air: Flow: 60 SCFM (at igniter)
Pressure Drop: Approximately 3 in. (76.2mm ) WC across device
Connection: 1½ inch NPT female
Available in 2 inch (50.8mm) increments from 24 to 180 inches (609 to 4572 mm)
Guide Tube Outside Diameter: 4”(101.6 mm) – igniter can be installed in an existing mount tube for a 4” (101.6 mm) diameter device
Mount Tube Outside Diameter: 4.5” (114.3 mm)
Construction Material: Guide Tube and Mount Tube – Carbon Steel
Furnace End of Guide Tube – 304 Stainless Steel
Oil Tip Assembly – 304 Stainless Steel
Retraction Assembly Per Customer Requirements
Oil Tip Assembly Narrow or Wide angle, as required
NFPA Class 1, 2 or 3
* Individual igniters are sized to the specified capacity requirement when ordered. No turndown is available. To change igniter capacity, please contact the factory.

HESI Specifications

Input Voltage: 120 to 240 VAC, 50/60 Hz
Input Power: 120 VAC @ 1.5 A (2-A fuse); 240 VAC @ 0.75A (1-A fuse)
Output Voltage: 2000 VDC
Output Energy: 12 joules per spark
Spark Rate: 3 per second (approximately)
Duty Cycle: 50% at temp 0°F to 135°F (-18°C to 57°C) Ambient

DuraFire Technical Bulletin
Publication Number 404006-04

DuraFire Manual
Publication Number 372000-47

Oil Igniter Durafire

Features & Benefits

  • Class 1, 2 or 3 oil igniter
    Capacity range from 6 to 30 MBtu/hr.
  • Application Flexibility
    The protected primary combustion zone ensures reliable operation in multiple environments.
  • Easy Retrofit
    With a diameter of only 4″, the DURAFire® fits most burners.
  • Low Maintenance Requirements
    No moving parts, a self-cleaning spark tip and no tools required to perform periodic inspection.
  • Reliable Ignition
    95% ignition rate in most applications.
  • High Efficiency Air Atomizer
    The internal mix atomizer is selected from a standard set of sizes for each project.
  • Cooling/Combustion Air
    Low cooling/combustion air requirements.
  • Durability
    Heavy duty material and no moving parts to wear out.
  • Compatibility
    Fits most existing mount tubes minimizing retrofit installation costs.