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  1. Replies
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    Oiling Fan Bearings

    I have a Ruud UGFD high efficiency 75,000 BTU furnace, installed in November of 2005. The furnace it replaced (1960 vintage) had tiny little "bowls" above the fan bearings, that you could put oil...
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    Continuous fan operation to reduce mold

    Could you clarify a bit? Mr. Teddy Bear stated "During the off cycle, the moisture on the coil slowly evaporates into the ducts. The %RH in the ducts is +80% for days. This occurs even when the home...
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    1,197

    UV lamp and shadows

    Does the UV lamp go above, or below, the peak of the A frame AC coil? It would seem to me that you would almost need two lamps, to expose all parts of the A frame coil to light (1 above and 1...
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    MERV 8 vs 11 for 2.5 Ton AC

    I have a Ruud UGFD high efficiency 75,000 BTU furnace; a Rheem 2.5 ton 13 Seer Air Conditioner, and an Air Bear filter housing (19.75” X 24.25” X 4 and 7/8”; or 2,000 CFM). The filter I am currently...
  5. MERV 8 vs 11 for 2.5 Ton AC

    I posted a related question, but decided to move it to the residential HVAC form, under the heading "MERV 8 vs 11 for 2.5ton AC".
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    I think I now concur that, given this somewhat...

    I think I now concur that, given this somewhat narrow and technical definition of efficiency, burning outside air would will actually reduce the efficiency of my furnace. It also agree that the...
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    1,415

    I have a Ruud UGFD high efficiency furnace. I...

    I have a Ruud UGFD high efficiency furnace. I have been persuaded to burn outside air, and need to have a horizontal intake pipe added (in addition to the horizontal exhaust pipe I already have).
    ...
  8. Perel - regarding concentric vent

    The owners manual for my furnace says that a concentric vent would require a 5 inch diameter hole thru the side of my house. Since its a brick house, that would require cutting thru more than 1...
  9. I have a Ruud UGFD high efficiency furnace. I...

    I have a Ruud UGFD high efficiency furnace. I have been persuaded to burn outside air, and need to have a horizontal intake pipe added (in addition to the horizontal exhaust pipe I already have).
    ...
  10. I recently had a Ruud UGFD high efficiency...

    I recently had a Ruud UGFD high efficiency furnace installed. (It has the modulating capability and an electrically efficient ECM2+ motor, but that’s probably not relevant to my question.)

    This...
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    On another HVAC related form, somebody made the...

    On another HVAC related form, somebody made the claim that R410a units do not remove humidity as well as a R22 unit of the same size. I'm not sure if I understood him correctly but I think he...
  12. How many other professional members agree with...

    How many other professional members agree with the above quote? Would you consider Rheem R410a systems as "designed from the ground up for R-410a"?

    Also, at one point some people thought that...
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