Model AFS?275?112 is a general purpose proving switch designed for HVAC and Energy Management applications. It may be used to sense positive, negative, or differential air
pressure
I have a 1981 Reznor ceiling mounted furnace that worked fine until the last year. The air intake proving switch failed because a wasp nest had totally filled the 6" pipe! Taking it apart showed the diaphragm was split. This product, though the photo was not exactly what was shipped (the actual one had nips not fittings on it) worked immediately with a bit of modification with a piece of hose. It works great now. Bye nest, thanks Pex!
David, custom furniture builder
Western Massachusetts
13 years ago
Verified Buyer
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