Nordyne Intertherm 661027 Gas Main Burner Orifice No. 27

Product Description

The NORDYNE INTERTHERM 661027 is a natural gas main burner orifice used in residential and light-commercial furnace burner assemblies. The orifice is drilled to a No. 27 drill size, which meters the flow of natural gas from the manifold into the burner tube, where it mixes with combustion air and ignites. This precise aperture size is critical for maintaining the correct fuel-to-air ratio, flame stability, and efficient combustion. The part seats at the inlet of the primary burner on the gas distribution manifold. Licensed HVAC technicians install and service this component during routine burner maintenance, orifice replacement, or fuel-type conversion work.

This orifice is designed for natural gas applications and is installed at the manifold inlet of compatible furnace burner assemblies. It is positioned at the primary burner inlet to regulate gas delivery into the burner tube during each heating cycle. The No. 27 drill size is specific to natural gas metering requirements, and substituting an orifice of the wrong drill size will result in incorrect combustion, improper flame appearance, or unsafe operation. Typical installations involve multiple orifices, one per burner port, along the manifold.

Key Features

• No. 27 drill size aperture meters natural gas flow to the burner tube
• Seats at the primary burner inlet on the furnace gas manifold
• Controls fuel-to-air ratio for stable flame formation during heating cycles
• OEM part number 661027 ensures direct fitment on compatible NORDYNE INTERTHERM furnaces
• Lightweight construction at 0.06 pounds

Compatibility

Designed as an OEM-style replacement natural gas main burner orifice for compatible NORDYNE INTERTHERM furnace burner manifold assemblies requiring a No. 27 drill size orifice.

Installation Notes

Installation and replacement of gas burner orifices must be performed by a licensed HVAC technician in accordance with applicable codes, including the International Fuel Gas Code (IFGC) and local authority having jurisdiction (AHJ) requirements. Always shut off the gas supply at the manual shutoff valve and disconnect electrical power to the furnace before accessing the burner manifold. Use the correct thread sealant rated for gas service when reinstalling the orifice, and verify there are no gas leaks with an approved leak-detection solution after restoring gas supply. Do not substitute a different drill size orifice, as incorrect sizing will affect combustion performance and safety.

Technical Specifications

• Orifice Drill Size: No. 27
• Fuel Type: Natural Gas
• Weight: 0.06 pounds

Standard Information

• Brand: NORDYNE INTERTHERM
• Manufacturer Part Number: 661027