Thread: Screen in jets of furnace

I have never seen this before. There was 1/8 pieces of screen in the jets of this 80 percent furnace. Manufactured in 1993.

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That screen look like the ignitor on a garage gas space heater I have. Are they by chance the ignitor for the gas furnace? or maybe bug guards?

It's been a while since I've seen these and as I recall these screens did not turn out to be a useful idea. I don't remember what their purpose was but if my memory is right I believe that they can be removed without affecting the furnace's operation.

Originally Posted by mathew stouffer

I have never seen this before. There was 1/8 pieces of screen in the jets of this 80 percent furnace. Manufactured in 1993.

Matthew,

I see those relatively often. I always assumed that they served the same purpose as the NOX rods of some earlier furnaces. If you don't know what they are, then you can always say so and defer. I would never recommend removal. Let a heating contractor do that.

Just a guess, but perhaps they are there to cause some turbulence and better mixing of gas and air for better combustion. Been away from the HVAC trade too long to remember.

Thanks

Originally Posted by Steven Saville

Just a guess, but perhaps they are there to cause some turbulence and better mixing of gas and air for better combustion. Been away from the HVAC trade too long to remember.

That would be my guess. At one time the "high performance" gas heaters and water heaters used turbulators to help efficiency. My guess is that they were later discarded because of the possibility of plugging the chamber.