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Description
52W29 Furnace Flame Sensor Replacement - For Lennox Armstrong & Ducane Furnaces - 2 Pack52W29 Furnace Flame Sensor Key Features Constructed with a metal alloy rod and a ceramic insulator for high temperature durability and conductivity. Detects burner flame to allow safe and continuous furnace operation. Rod Length: 2 3 4 inches Connector Size: 3 16 inch Replaces Cross Reference Part Numbers 52W29 52W2901 31L71 31L7101 LB 74940A 28PV41 903600 FLS52W29 Compatibility & Fitment Direct replacement for specific furnace models from Lennox,
52W29 Furnace Flame Sensor
Key Features
- Constructed with a metal alloy rod and a ceramic insulator for high-temperature durability and conductivity.
- Detects burner flame to allow safe and continuous furnace operation.
- Rod Length: 2-3/4 inches
- Connector Size: 3/16 inch
Replaces / Cross-Reference Part Numbers
- 52W29
- 52W2901
- 31L71
- 31L7101
- LB-74940A
- 28PV41
- 903600
- FLS52W29
Compatibility & Fitment
- Direct replacement for specific furnace models from Lennox, Armstrong, and Ducane.
- Confirmed fit for G40, G41, G50, and G51 series furnaces.
- Verify fitment by matching your original part number to the cross-reference list.
When to Replace
- The furnace cycles on but the burner shuts off after a few seconds.
- The furnace fails to produce heat or does not stay lit.
- The ceramic insulator on the existing sensor is cracked or broken.
- The metal rod is corroded, covered in carbon buildup, or physically damaged.
Installation Tips
- Disconnect all electrical power to the furnace before beginning service.
- Handle the new sensor by its ceramic base; avoid touching the metal rod with bare hands as skin oils can cause premature failure.
- Ensure the single mounting screw is secure but not overtightened to avoid cracking the ceramic.
- Position the sensor so the metal rod is properly enveloped by the burner flame during operation.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 17 reviews
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Product Reviews
★★★★★ 5
Easy to install
Style: CF10374 Classic
The frame is made of hard plastic (color black) which fits perfectly in the air cabin filter system of a Toyota Tacoma 2006 V6. It holds it's shap quite well. The carbon filter is able to be seen and works so far. The quality seems good and the thickness of the filter is well made with a foam outter film that makes it fit my Tacoma very well. I'm happy with it. The ease of installation is good and it is well worth the money.
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Reviewed in the United States on March 9, 2026
★★★★★ 5
Filter quality and value
Style: CF11809 Classic
2nd time to purchase this item over a 5 year period. The filter has a rigid frame making last much longer than other paper filters. Perfect fit and worth the cost. Great job filtering cabin and neutralizing odors!
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Reviewed in the United States on March 19, 2026
★★★★★ 5
Simple Upgrade That Makes a Real Difference
Style: CF10140 Classic
Installed the Zezut cabin filter in my 2005 Infiniti G35 and noticed the difference immediately. The air inside the car felt fresher and cleaner right away — no more stale air circulating through the vents. The HEPA backing is a big deal, knowing it's actually filtering out dust, pollen, and particles rather than just being a basic filter gives you real peace of mind. The quality feels solid and well made. Installation was super easy, took just a few minutes with no tools needed. For the price this is one of those simple maintenance upgrades that's absolutely worth doing. Your lungs will thank you. Great price and affordable, top choice for replacement in my opinion.
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Reviewed in the United States on April 27, 2026
★★★★★ 4
Good filter.
Great filter works well .
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Reviewed in the United States on May 12, 2026
★★★★★ 5
Efficient long lasting. Great Value
Style: CF10735 Classic
These filters (my second one) has lasted me over two years with a little maintenance in between, (removing from time to time to vacuum and shake out the bigger debris.) They do a great job of keeping the cabin air really clean and fresh.
1) Over designed and built (Good thing) installed without effort.
2) Fit and finish is perfect for my 2016 Genesis G80
3) Carbon filter works well but after about six months it no longer absorbs orders, This is excepted especially when I have not swapped it out for over two years.
4) Great value and honestly I should be replacing these cabin filters out ever six months for efficiency and order control.
Note: When I decided to replace it the filter held up structurally as the day I installed it. The charcoal beads where all intact as well.
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Reviewed in the United States on January 30, 2026