Lennox 74W71 Manifold
The Lennox 74W71 Gas Manifold (OEM part 103087-02) is a precision-engineered component designed for high-efficiency fuel distribution in Lennox gas furnaces and select commercial rooftop units. As a direct-fit HVAC replacement part, it ensures balanced gas flow to the burner assembly, mitigating pressure fluctuations that cause combustion instability and resonance noise. Constructed from aluminized steel, this manifold resists the high-heat corrosion common in furnace compartments, maintaining interior diameter integrity for consistent fuel delivery. Whether you are performing a furnace repair or a system-wide upgrade, the 74W71 is compatible with both natural gas and propane (LP) configurations, though orifice replacement is required for fuel conversion. Contractors should verify manifold pressure (typically 3.5" W.C. for NG) post-installation to ensure the burner manifold meets factory specifications. This gas manifold assembly eliminates the variables associated with third-party components, providing the exact port alignment needed for efficient ignition and heat exchanger performance.
- Optimized Combustion: Delivers uniform gas pressure for stable flame patterns and reduced carbon buildup on heat exchangers.
- OEM Construction: High-grade aluminized steel prevents scaling and oxidation in high-operating-temperature environments.
- Versatile Compatibility: Engineered for residential and light commercial Lennox systems using natural gas or LP.
- Direct Fit: Factory-aligned port spacing ensures no-hassle installation without field modifications to the burner rack.
Can the 74W71 be used with Liquid Propane?
Yes, this manifold is compatible with LP; however, because gas densities differ, you must install the appropriate LP orifices and adjust the gas valve regulator to achieve the required manifold pressure.
Does this include the gas orifices?
Standard replacements typically do not include orifices. You should reuse existing ones or source new orifices matched to the specific BTU rating of your unit's burner orifices.
Why is my current manifold showing white powder or scale?
This is often a sign of oxidation or corrosion. Replacing the manifold ensures that port sizes remain precise and that no debris clogs the burner orifices, which would lead to poor heat transfer.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $146.34
-65%$146.34
$51.22Lennox 74W71 Manifold
The Lennox 74W71 Gas Manifold (OEM part 103087-02) is a precision-engineered component designed for high-efficiency fuel distribution in Lennox gas furnaces and select commercial rooftop units. As a direct-fit HVAC replacement part, it ensures balanced gas flow to the burner assembly, mitigating pressure fluctuations that cause combustion instability and resonance noise. Constructed from aluminized steel, this manifold resists the high-heat corrosion common in furnace compartments, maintaining interior diameter integrity for consistent fuel delivery. Whether you are performing a furnace repair or a system-wide upgrade, the 74W71 is compatible with both natural gas and propane (LP) configurations, though orifice replacement is required for fuel conversion. Contractors should verify manifold pressure (typically 3.5" W.C. for NG) post-installation to ensure the burner manifold meets factory specifications. This gas manifold assembly eliminates the variables associated with third-party components, providing the exact port alignment needed for efficient ignition and heat exchanger performance.
- Optimized Combustion: Delivers uniform gas pressure for stable flame patterns and reduced carbon buildup on heat exchangers.
- OEM Construction: High-grade aluminized steel prevents scaling and oxidation in high-operating-temperature environments.
- Versatile Compatibility: Engineered for residential and light commercial Lennox systems using natural gas or LP.
- Direct Fit: Factory-aligned port spacing ensures no-hassle installation without field modifications to the burner rack.
Can the 74W71 be used with Liquid Propane?
Yes, this manifold is compatible with LP; however, because gas densities differ, you must install the appropriate LP orifices and adjust the gas valve regulator to achieve the required manifold pressure.
Does this include the gas orifices?
Standard replacements typically do not include orifices. You should reuse existing ones or source new orifices matched to the specific BTU rating of your unit's burner orifices.
Why is my current manifold showing white powder or scale?
This is often a sign of oxidation or corrosion. Replacing the manifold ensures that port sizes remain precise and that no debris clogs the burner orifices, which would lead to poor heat transfer.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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Description
The Lennox 74W71 Gas Manifold (OEM part 103087-02) is a precision-engineered component designed for high-efficiency fuel distribution in Lennox gas furnaces and select commercial rooftop units. As a direct-fit HVAC replacement part, it ensures balanced gas flow to the burner assembly, mitigating pressure fluctuations that cause combustion instability and resonance noise. Constructed from aluminized steel, this manifold resists the high-heat corrosion common in furnace compartments, maintaining interior diameter integrity for consistent fuel delivery. Whether you are performing a furnace repair or a system-wide upgrade, the 74W71 is compatible with both natural gas and propane (LP) configurations, though orifice replacement is required for fuel conversion. Contractors should verify manifold pressure (typically 3.5" W.C. for NG) post-installation to ensure the burner manifold meets factory specifications. This gas manifold assembly eliminates the variables associated with third-party components, providing the exact port alignment needed for efficient ignition and heat exchanger performance.
- Optimized Combustion: Delivers uniform gas pressure for stable flame patterns and reduced carbon buildup on heat exchangers.
- OEM Construction: High-grade aluminized steel prevents scaling and oxidation in high-operating-temperature environments.
- Versatile Compatibility: Engineered for residential and light commercial Lennox systems using natural gas or LP.
- Direct Fit: Factory-aligned port spacing ensures no-hassle installation without field modifications to the burner rack.
Can the 74W71 be used with Liquid Propane?
Yes, this manifold is compatible with LP; however, because gas densities differ, you must install the appropriate LP orifices and adjust the gas valve regulator to achieve the required manifold pressure.
Does this include the gas orifices?
Standard replacements typically do not include orifices. You should reuse existing ones or source new orifices matched to the specific BTU rating of your unit's burner orifices.
Why is my current manifold showing white powder or scale?
This is often a sign of oxidation or corrosion. Replacing the manifold ensures that port sizes remain precise and that no debris clogs the burner orifices, which would lead to poor heat transfer.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
