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MaxFire® Gas Igniter

  • Forney's MaxFire® Gas Igniter side view photo
  • Closer look of Forney's MaxFire® Gas Igniter

The MAXFire® Series 100 gas igniters can be used as a Class 1, Class 2, or Class 3 igniter, depending on burner capacity. The MAXFire® igniter is easily installed as a retrofit into most burner types based on its size, capacity, and reliable operation.

MAXFire® gas igniters consist of four major components: a guide tube, a gas transport tube, a spark rod, and a stainless steel diffuser for pilot stabilization. The guide tube houses the spark rod and the gas transport tube, which are 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. The 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 migrating into the end of the guide tube.

MAXFire® gas igniters come 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. Optional equipment for the MAXFire® includes a High Tension Spark (HTSI) source in place of the HESI, mounting hardware, hoses, flame rod and an integral or externally mounted optical flame detector.


Fuel: Natural gas or propane
Minimum Length: 14 inches
Guide Tube Material: 10 & 30 – Stainless steel
35, 40 & 50 – Carbon steel with 12” stainless steel at furnace end

Tube OD
Connections (NPT)
Gas Air
Cooling Air
Typical Fuel
Pressure (psig)
110 0.3 to 1.5 1 7/8” 1/2” 3/4” 23 @ 3 Straight 5-12
130 1.5 to 6.0 2 7/8” 3/4” 3/4” 45 @ 3 Straight or wide 5-12
135 5.0 to 15 3 1/2” 1 1/2” 1 1/2” 50 @ 6 Straight or wide 5-25
140 5.0 to 25 4” 1 1/2” 1 1/2” 80 @ 6 Straight or wide 5-25
150 10 to 50 5” TBD TBD 120 @ 6 Straight or wide 5-25
*scfm@inches w.c. above windbox

HESI Specifications

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

HTSI Specifications

Amperage:20 mAInput Voltage:120 to 240 VAC 50/60 HZOutput Voltage:6000 VACDuty Cycle:100% at temperature rating

Maxfire Drawing

Features & Benefits

  • Class 1, 2 or 3 Gas Igniter
    Capacity range from 0.3 to 50 MBtu/hr.
  • Application Flexibility
    The protected primary combustion zone ensures reliable operation in multiple
  • Reliable Ignition
    99% ignition rate in most applications
  • Cooling / Combustion air
    Low cooling/combustion air requirements.
  • Low Maintenance requirements
    No moving parts, a self-cleaning spark tip and no tools required to perform periodic inspection
  • Durability
    Heavy duty material and no moving parts to wear out.
  • Compatibility
    Fits most existing mount tubes minimizing retrofit installation costs.
  • Spark Source Options
    The nonfouling HESI comes standard. HTSI provides high performance at an economical price.