52W2901 Flame Sensor for Lennox Furnace Flame Sensor Replaces 52W29 LB-74940A 31L71 31L7101 Fits G40 G41 G50 G51 G60 G61 G711（Note: Please Check The Size Before Purchase）

Seems to work fine but usually only lasts one season.

Picked this up as a spare for future furnace maintenance. It appears well-built and exactly as described. The price was fair, and delivery was quick-couldn't ask for more. Glad to have it on hand just in case!

I would rather replace than clean at this price.

This is listed as a direct replacement for my furnace but the connector is too big. Had to use a Dremel to modify the connector so I could plug it into my furnace. So far it works with the modification I had to make to make it work.

I checked the dimensions and still bought it wrong but it worked at the end. Pay close attention to the 0.3in at the bottom of the sensor because that will connect to your existing set up. Mine was actually 0.2in so I had to stretch it a bit but it worked.

Such a complete waste of time. This does not fit the furnace stated in the description.

Easy to install.

I have ordered this flame sensor before. It works well. (The previous one had a electrical spade connector that was a touch wide.) I used my Dremel tool make it a touch smaller so it would fit the connector on the Lennox furnace. The particular item that was just received is a spare sensor to have on hand when it is required. It appears to have the correct size spade for the Lennox connector. The price was right. It was received in a timely fashion although there was no hurry to get it.