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  1. Replies
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    I am not doing any HVAC repairs right now, will...

    I am not doing any HVAC repairs right now, will keep this advice for the future, thanks. I did not use AC yet this summer, maybe a month per year use.

    The original question was about the noise. So...
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    Can you please explain why not in simple terms. I...

    Can you please explain why not in simple terms. I tried to figure it out myself, but still struggling to understand the purpose of T (did I got abbreviation correctly).

    Here is my setup direction...
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    Thank you all for helping me to understand my...

    Thank you all for helping me to understand my issues.
    I have found P trap, I do have it, got HOA come and clean the drainage line and install a cap over drain line vent. Apparently second floor AC...
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    Here is my setup ...

    Here is my setup

    https://i.imgur.com/aFzae3q.jpg

    So my setup is missing condensation line P-trap, would this potentially create problems for me? What kinds?
    If my, below me, neighbors have...
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    Thanks, it is getting there. One more time to...

    Thanks, it is getting there.

    One more time to recap my problem and suggestions here.

    Vibrating pipes are from my neighbors unit or units, who lives below me, so I can not just experiment on how...
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    Does any previous solutions from my first condo...

    Does any previous solutions from my first condo make any sense (insulating rooftop lines and adding coils to them)?
    It is definitely from working AC (mine is off), so it is a pipe connecting...
  7. Replies
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    HVAC vibrating line (lines) in the wall

    Hi
    I am living in 4 story condominium, top 4th floor. Moved in during winter, the noise was not there, when, most likely, all heat pumps were working (it was crispy cold for California.
    Now comes...
  8. I am not shopping on EBay. But hoping to find USA...

    I am not shopping on EBay. But hoping to find USA solar exhaust fan manufacturer who produce such fans. So far all contacted contractors are offering me whole house ventilation systems, complicated,...
  9. Which manufacturer? That is why I created this...

    Which manufacturer? That is why I created this thread, as I have difficulty finding the one who actually manufacturing roof exhaust fans with variable speed DC ECM motors, so I can attach Solar panel...
  10. If you look on the other thread, I would see...

    If you look on the other thread, I would see where I posted 4 pictures of my roof, there is a skylight installed by my neighbor, who got HOA and City permits to do so. Again, read the original thread...
  11. A. I have very poor ventilation in my condo, air...

    A. I have very poor ventilation in my condo, air is stalled. I dropped a link to the first thread where there is good discussion about it, please read.
    B. VAriable or multi speed so I can control te...
  12. Everything you said makes sense, and, generally I...

    Everything you said makes sense, and, generally I accept it all and willing to investigate further.

    Would you point me into the right direction with "a commercial exhaust hood", can you drop a few...
  13. Thanks, actually. For pointing me to another...

    Thanks, actually.

    For pointing me to another good direction. This forum is very helpful, but you are right about more specific forums, I did not know they exist.

    Is it OK to mention other...
  14. I started new thread [B]here[/B...

    I started new thread here for variable speed controller for solar attic fan, as it seems to be major obstacle at this point.
  15. I have an idea. Please tell me if it is going...

    I have an idea.

    Please tell me if it is going to work.

    What if I install regular solar attic fan with thermostat controller by first vendor and then hire electrician to remove thermostat and...
  16. Solar Attic Exhaust fan with speed controller - do they exist?

    Hello

    I have difficult project underway - remove stalled air from my condominium (I live right under the roof). The most economical device is Solar Attic Exhaust Fan, but those fans comes only...
  17. EDPM is the roof material to use to overlap and...

    EDPM is the roof material to use to overlap and seal roof perforations? Good to know.

    Another question regarding "rain and moisture proof". Does Attic fan is moisture tight, would moisture during...
  18. I was thinking about 3 10 watt fans (each around...

    I was thinking about 3 10 watt fans (each around 800 CFM) to run with speed controller, where my 4-5 air exchanges (somewhere between 500 and 600 CFM) would be Medium or Low speed. Earlier we come to...
  19. Contractor said that Attic Solar Exhaust fan...

    Contractor said that Attic Solar Exhaust fan would not work, that they would have to "Micky Mouse" (read DIY) a lot of parts to make this idea work? They did not elaborate on details.

    Battery...
  20. So only the seal is the possible problem? I...

    So only the seal is the possible problem?
    I offered to the last contractor HOA roofer services - I basically told them that I will contact that roofer to fix the roof after them. Contractor was...
  21. Thanks Actually I found a few interesting...

    Thanks
    Actually I found a few interesting things.
    Attic Solar Exhaust Fan

    and controller

    Unfortunately it is weather/conditions controlled, not on demand, as I need. But it is very close.
    ...
  22. Major Update I dealt with 2 middle sized...

    Major Update

    I dealt with 2 middle sized vendors about my issues.
    Both strongly advised against Attic type fan exhaust solution stating that it is not going to be weather proof on horizontal...
  23. Hm. I see your points. I just want to substitute...

    Hm. I see your points. I just want to substitute very slight breeze from my windows. So, if LA air is so bad, I have to keep windows always closed? In my previous place of residence my unit (it was...
  24. My post above gives approximate size for my...

    My post above gives approximate size for my condo.

    Does anyone knows if multi speed or variable solar fans exist? So, I can control them from my unit, even High (full speed), Medium and Low will...
  25. My windows are about 40 eq. ft. It doesn't make...

    My windows are about 40 eq. ft. It doesn't make sense, your formula, I mean, if I put 10 K CFM fan it will suck me through, not just an air?!. People above were talking about around 1000 CFM fans...
  26. Let me try to describe the force, I understand...

    Let me try to describe the force, I understand the "subjective" issue, so if I was a smoker, if I take a puff, I would see clouds moving slowly toward to exhaust fan, not disappearing, because it...
  27. Right now I have issues due to the stalled air,...

    Right now I have issues due to the stalled air, so money spent for an initial cost of installation are not as important as money spend for an electrical bill, so to speak.
    What power (CFM) do I need...
  28. Thanks Would something like I found work for...

    Thanks

    Would something like I found work for me. Not exactly that unit, but similar? Solar powered, proffered.
  29. Since I found that PRV unit I can not figure out...

    Since I found that PRV unit I can not figure out CFM needs.

    Smallest unit from that manufacturer pulls air at 660 CFM rated for 900 sqf, what does it mean in terms of moving air, is it a lot and...
  30. Thanks a bunch! Within a minute I was able to...

    Thanks a bunch!

    Within a minute I was able to find this, it makes me feel better already, will investigate further. Just need to figure out how much noise it generating, but it is a start.
  31. This is not my point at all. The A/C size is...

    This is not my point at all.

    The A/C size is right, maybe half ton larger. I don't want to run A/C, I just want to get outside air into my unit. I will run A/C when it is hot or cold.
  32. Negative pressure is what I need, indeed. As for...

    Negative pressure is what I need, indeed. As for my statement above, my windows almost always open, except when it is heavy rain or when it gets cold and I am using heater. In this case I have not...
  33. You missed the point. My all windows are always...

    You missed the point. My all windows are always open, however since unit is facing one direction, and building is in the crowded city, wind rarely blows directly and I have very poor natural...
  34. I don't know exact terminology here. It is not an...

    I don't know exact terminology here. It is not an attic space I need to ventilate, but my condo unit. We don't have attic, what I called attic is the space between the actual rooftop and my unit...
  35. Probably something like this. I checked their...

    Probably something like this. I checked their products, it seems that all units are installed in the "inner roof/attic" space. How about something on top of the roof? The space between our roof and...
  36. What I see now, is that I need an option called...

    What I see now, is that I need an option called "Exhaust-only mechanical ventilation". Sources say examples like bathroom fans, which are noisy enough,
    Are there any types of rooftop fans, which ca...
  37. Thanks for clarification. SO, what are my...

    Thanks for clarification.

    SO, what are my options , do I have any? I need to exhaust air from my unit. I can not place exhaust fan on my windows, that is out of the question.
    So I need something...
  38. Rooftop ventilation for condominium advice needed

    Hi
    I live on the third floor, under the roof in residential condominium. Windows are faced only one direction, West. Even when the wind blows down the street, air inside my unit is not moving, very...
  39. Basically the question was - does anyone have...

    Basically the question was - does anyone have experience with TrueAire Return Grilles similar to 2 pictures provided. And if yes, does it require a lot of pressure to close those latches, this is it....
  40. Thanks for replies First. Residential. Second....

    Thanks for replies
    First. Residential.
    Second. I choose to have T-Bar loose, so it would be easier to do maintenance on air handler, and also, cleaning from the dust inside. Previous T-Bar was...
  41. TruAire return air filter grille configuration

    Hi
    I have a problem with return grille operation (new install) - it is mounted on T Bar ceiling, which is very light weight, so closing latches is very difficult, because sufficient amount of...
  42. Replies
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    Thanks for quick response Dampers. I actually...

    Thanks for quick response

    Dampers. I actually need dumper only in one room, my wife's, as she can not stand strong air blow and AC, possible to install in my location, would be one speed only,...
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    Direction controlled register

    Hi

    Quick question. Check picture below.

    http://www.homedepot.com/catalog/productImages/1000/f2/f235957b-0684-47de-80f1-13a5e8c1d561_1000.jpg

    Does anything exists with controlling air flow...
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    @dan sw fl Thanks a lot for all your time...

    @dan sw fl

    Thanks a lot for all your time spent in this post. I am trying to make sense of all calculations.

    So, I decided to provide the most accurate description of our condo and if you can...
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    After all considerations and recommendations we...

    After all considerations and recommendations we decided to scale down our needs to more efficient system, 2 ton, which is slightly overkill anyway according to approximate calculations made by dan sw...
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    I am not planning to have such a short bursts, it...

    I am not planning to have such a short bursts, it will run longer. My climate is generally dry and we are using simple air humidifiers, so if AC would not remove moisture from the air that would be...
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    Above is the ceiling, roof for the CONDO...

    Above is the ceiling, roof for the CONDO building, below our heads, as it located in the hallway, door opening is about 1.5" below the T-BAR structure, 14" is the space between T-BAR and ceiling.
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    Thanks Roof unit will be American Standard, I...

    Thanks
    Roof unit will be American Standard, I can not remember air handler manufacturer, but it is only 10" high (I checked your links, all air handlers are larger), which fit tight in my 14" total...
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    Unfortunately, the way it pictured in one of the...

    Unfortunately, the way it pictured in one of the links, UNICO can not fit. I have 14"x34"x100" where 14" is height, 34" width and 100" is length for everything including piping, ducting etc. Unless...
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    Thanks I am trying to understand, is this roof...

    Thanks
    I am trying to understand, is this roof (my case) unit plus air handler, if yes, what are the dimensions and weight (roof part), as home association has specific rules and there is limited...
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