this post was submitted on 29 Apr 2026
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Do It Yourself

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I am adding a UV light to my furnace coils. I decided to cut an access panel for easier cleaning and access to the UV light. I did not realize there were these triangular end covers for the A-frame of the furnace evaporator coils.

I don’t see them anywhere online when looking up diagrams of furnace coils. When I search online, it is also not clear if these covers are necessary. Are these covers beneficial? Or can I take one side off to fit the UV light underneath the A-frame?

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[–] schwim@piefed.zip 0 points 3 weeks ago (1 children)

It's only necessary if you want your furnace to heat the air. Without it, air will simply take the path of least resistance and bypass the coils entirely.

[–] loopy@lemmy.today 0 points 3 weeks ago

Thank you, that makes sense. I did not realize the air all gets forced through like that.