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  1. looks like cheap junk to me. i do hope you never...

    looks like cheap junk to me. i do hope you never want to provide hot air through this thing.
    there are proper ways selecting a commercial diffuser for the application.
    try a company like Titus,...
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    while it is true that all dampers will have a...

    while it is true that all dampers will have a resonance frequency, the reputable vav manufacturers test their units and design the dampers to have a frequency outside of the normal operating range....
  3. Thread: Vulcan VAV Boxes

    by nik99
    Replies
    3
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    495

    it has been many years since i have seen one of...

    it has been many years since i have seen one of these. post a couple pictures to jog my memory and i can probably help you with your problems.
    what controls are on them?
  4. Thread: Pneumatics

    by nik99
    Replies
    12
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    827

    as prevously stated there are lots of variables...

    as prevously stated there are lots of variables and different systems.
    however 3-8 psi is very very common. 3 or lower being being full open, 8 or higher being full closed.
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    the unit comes with a door interlocking...

    the unit comes with a door interlocking disconnect on the enclosure. why would you not just run direclty from the breaker to that switch?
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    New York is home of Carrier, can't fight VVT...

    New York is home of Carrier, can't fight VVT there, politics, jobs etc...
    Carrier doesn't build a fan box.
    I would also use hot water instead of electric as their electricity is expensive and they...
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    When you use this type of controller,...

    When you use this type of controller, direct/reverse acting and normally open/closed have no relationship to each other.
    you can have any combination of the above.
    it is not like just using an...
  8. Thread: Titus Box

    by nik99
    Replies
    2
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    480

    http://www.titus-hvac.com/ecatalog/getfile2.aspx?f...

    http://www.titus-hvac.com/ecatalog/getfile2.aspx?fileid=5781

    they don't post the charts themselves (call Titus for copies) but you can calculate the values using the K factors on this sheet.
  9. Thread: VAV

    by nik99
    Replies
    10
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    967

    A vav manufacturers catalog is probably the...

    A vav manufacturers catalog is probably the easiest place to start.

    http://www.nailor.com/onlinecatalogs/CAT-06/CAT1START.pdf
  10. a vav box air volume has nothing to do with...

    a vav box air volume has nothing to do with smoke.

    the noise from the box selections will drive everyone out of the building anyway.
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    answer above gives you a very high torque...

    answer above gives you a very high torque actuator for a typical damper.

    the real answer depends on the type of damper used and the manufacturer.
    very low leakage dampers are tightly fitted and...
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    that is a very low torque for a damper that size....

    that is a very low torque for a damper that size.
    if the damper twists slightly as the metal contracts in the cold the torque will increase dramatically, could be dirty bearings, moisture buildup in...
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    838

    RH is no good unless we tie to a specific...

    RH is no good unless we tie to a specific temperature.
    Where did you get dew point info?
  14. Replies
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    838

    i tried this, they either can not or will not...

    i tried this, they either can not or will not give me an answer.
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    3,755

    USP 797, United States Pharmacopia is the...

    USP 797, United States Pharmacopia is the relevent standard for pharmacy areas in the US. Also check the ashrae/aia sources above.
    For bio-safety labs there are specific requirements that I think...
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    838

    Pharmacy Humidity Childrens Hospital

    I am working on project for a childrens hospital new pharmacy area.
    Basically the question that has arose is "what should be the humidity level in this room".
    This is not as straightforward as it...
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    3,755

    Latest standard for HVAC design is ASHRAE...

    Latest standard for HVAC design is ASHRAE Standard 170-2008
    Ventilation of Health Care Facilities
    You should also review the relevent handbook chapters.

    There is also the American Institute of...
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    634

    With regards to airflow, laminar means...

    With regards to airflow, laminar means non-aspirating or non-mixing. A laminar flow diffuser will create basically a column of air below it that does not mix appreciably with room air. Thats why they...
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    For the Nailor damper (or Ruskin) to meet the UL...

    For the Nailor damper (or Ruskin) to meet the UL requirements the factory sleeve must be there, and have the coating intact.
    You cannot mess around with that and meet their factory UL compliance,...
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    1,547

    rip it out quick and put in fibreglass.

    rip it out quick and put in fibreglass.
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    460

    mechanical drawings are widthxheight...

    mechanical drawings are widthxheight
    architectural drawings are heightxwidth

    i have no idea why?
  22. Thread: Electric Heaters

    by nik99
    Replies
    6
    Views
    591

    maxster Great you tube link, never seen that...

    maxster
    Great you tube link, never seen that before.
  23. Replies
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    2,598

    most of the bushings used on dampers are called...

    most of the bushings used on dampers are called self lubricating, meaning that they are usually oil impregnated bronze, or a type of plastic.
    Now before everyone here ridicules the...
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    this is the best source of info. lots of good...

    this is the best source of info. lots of good stuff but long and tedious reading.

    http://www.cdc.gov/ncidod/dhqp/gl_isolation.html

    in practice maintaining the pressure difference is very...
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    both the II and IIA are made by krueter and are...

    both the II and IIA are made by krueter and are essentially identical inside.
    if you grab a recently failed one and take it apart (note you will never get it back together) inside you will see a...
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