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  • Users: FBW
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  1. FBW

    Airborne Infectious Isolation Room Exhaust ducts, and the maintenance thereof.

    Does anyone know if there are any regulated policies / procedures for working inside these exhaust ducts ( working on sensors, dampers, inspections, etc)? I've asked the question at my site and no one seems to know the answer. Lots of opinions, but no reference to any...
  2. FBW

    Dahlander Motors

    Update, Took the belts off of the fan today and measured the no load current. On high speed it dropped, from about 20A to around 14. In low speed, there was almost no change, still pulling around 32A. It has a lot of people scratching their heads. Cant see anything wrong with the wiring, but...
  3. FBW

    Dahlander Motors

    Ive been pulled away on some other jobs for the time being but i'm hoping to get back at this issue as soon as possible, just need to talk an electrician into coming to have a look at things with me again. Been a great learning experience so far, and I will definitely update when i find out...
  4. FBW

    Dahlander Motors

    Been doing a lot of research on this, and given what i know now, i would agree on the idea that its not the ideal motor for a load like a fan, but as ScottyUK pointed out, it shouldn't be causing any grief so long as the high speed HP is adequate. It certainly shouldn't be causing the kind of...
  5. FBW

    Dahlander Motors

    Nameplate photo attached. Based on the comments above, i would guess this to be a constant torque motor, given that low speed HP is half of high speed, and little change in current in either speed (28/29). The motor is drawing around 20 amps in high speed, but in low speed its drawing 31-31...
  6. FBW

    Dahlander Motors

    Thanks for all the great replies so far. Ill have more info and nameplate details for you guys today.
  7. FBW

    Dahlander Motors

    Hello All, Having a few issues here on a dual speed motor running a fan, and i think im getting close to the answer, but i need a bit more insight from some experts. After a bit of research, I've come to the understanding that what I'm dealing with is a Dahlander motor, which essentially...
  8. FBW

    Health Care - Negative Isolation Rooms.

    I see your point, 317069, and in that regard i can now understand why it is the larger of the 2 MEASURED flows (inlet / outlet) will always define the actual ACH. Which answers my question. The real flows are equal, as you point out. But i'm only actually accurately measuring one of them at any...
  9. FBW

    Health Care - Negative Isolation Rooms.

    Sorry if i wasn't clear enough, I'm talking about a patient isolation room in a health care facility. That means it's not isolated in the sense that its 100% sealed and the walls will implode, as a human being has to remain alive inside, and people will be entering and exiting often. And we...
  10. FBW

    Health Care - Negative Isolation Rooms.

    Im having trouble trying to get some legit answers on if i should be using the supply or the exhaust to calculate ACH for negative isolation rooms. One would think that this would be obvious, as i was told that ACH is always calculated from the larger of the 2. However, i just read an ASHRAE...
  11. FBW

    HEPA filter in-situ certfication.

    Hello All, I'm hoping someone can shed some light on this issue, as I'm having a hard time finding meaningful information. I cant figure out which body actually certifies a person or organization to do in-situ HEPA filter testing in Canada, nor can i find out which standards organization in...
  12. FBW

    Basic Pressure / Flow question. My Brain hurts.

    Thanks guys for the great replies, it helps a lot. I love this site.
  13. FBW

    Basic Pressure / Flow question. My Brain hurts.

    Let me re-phrase that..i meant "by changing flow VELOCITY", not flow rate...
  14. FBW

    Basic Pressure / Flow question. My Brain hurts.

    Hi All, I'm wondering if someone can help me understand some pressure/flow concepts im having a hard time wrapping my head around. What started with me trying to figure out a theoretical flow of gas through an orifice has turned into 2 nights of google searches and now i give up. Can someone...
  15. FBW

    Earth Leakage Relay question..

    I'll have to check but im fairly sure that neutral is solidly grounded in their main distribution panel as required by NORSOK for this voltage level. The geneset came from the manufacturer in this orientation. I guess it's just a matter of satisfying my own curiosity here...if the star point...
  16. FBW

    Earth Leakage Relay question..

    I have a 400VAC generator here that will be used on an offshore platform, 4 wires out (1,2,3,N). There is a toroid type earth leakage relay on it inside the generator main breaker enclosure with all 3 phases and neutral running through it. My understanding is that the toroid will sense any...

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