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  1. #1
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    Default What is this duct mounted gizmo?

    I found this at a Dr. office today. Due to paint over-spray nothing was legible on the cover. It is mounted on the return air side prior to the disposable filter rack. It was only on two of the four units. I'm leaning toward some sort of UV treatment or the like. Anyone familiar with it?
    Ignore the complete AHU, loaded it by mistake and can't figure how to delete.
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    Jim Luttrall
    www.MrInspector.net
    Plano, Texas

  2. #2
    Ken Santell's Avatar
    Ken Santell Guest

    Default Re: What is this duct mounted gizmo?

    Use goof off on plastic to remove paint. Get a number, scan tag, or brand


  3. #3
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    Default Re: What is this duct mounted gizmo?

    Yep, smoke detector. This type has a shorter lifespan and only work if air is being drawn through the system. For this reason they are not the best option!

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  4. #4
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    Default Re: What is this duct mounted gizmo?

    Quote Originally Posted by Scott Patterson View Post
    ... This type has a shorter lifespan and only work if air is being drawn through the system. For this reason they are not the best option!
    What do you think would be a better option? Why?

    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  5. #5
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    Default Re: What is this duct mounted gizmo?

    Quote Originally Posted by Rick Cantrell View Post
    What do you think would be a better option? Why?
    Any of the photo electric type detectors that can be mounted on walls or ceilings. They detect a smoldering fire better which produce more CO.

    Duct type detectors are good in commercial systems that are alwys on and drawing air for the detector to detect smoke.

    Last edited by Scott Patterson; 03-10-2013 at 09:12 PM.
    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  6. #6
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    Default Re: What is this duct mounted gizmo?

    Ok, makes sense. Kind of weird they had it only on two of the 4 systems though.
    New construction of a 5000' Doctors office with full alarm and sprinkler system. I did call for it to be cleaned off and serviced since the filters were full of sheet rock dust and this sensor was before the filter.
    Thanks Guys!

    Jim Luttrall
    www.MrInspector.net
    Plano, Texas

  7. #7
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    Default Re: What is this duct mounted gizmo?

    Wall/ceiling mounted detectors warn the occupants of smoke (fire).
    A duct detector slows down the spread of smoke throughout the building.
    They are not used instead of wall/ceiling detectors, but are an addition to the system.
    So, for what they are used for (stopping the spread of smoke) duct detectors are the best option.

    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  8. #8
    Join Date
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    Default Re: What is this duct mounted gizmo?

    Rick is talking about the detectors shutting down the system/air handlers when they detect smoke. This is the norm for a commercial system.

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  9. #9
    David Bell's Avatar
    David Bell Guest

    Default Re: What is this duct mounted gizmo?

    A quick glance at that install shows a pan drain not connected, Improper hanging of unit.


  10. #10
    Join Date
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    iowa
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    Default Re: What is this duct mounted gizmo?

    Typically the commercial mechanical code only requires duct detection on units with a cfm in excess of 2000 cfm...possible the other two units are smaller.


  11. #11
    Join Date
    Dec 2007
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    Holladay, UT
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    Default Re: What is this duct mounted gizmo?

    I don't do much commercial but good info here. Thanks guys!!

    Tom Rees / A Closer Look Home Inspection / Salt Lake City, Utah

  12. #12
    Join Date
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    Default Re: What is this duct mounted gizmo?

    Quote Originally Posted by Henry Henchal View Post
    Typically the commercial mechanical code only requires duct detection on units with a cfm in excess of 2000 cfm...possible the other two units are smaller.
    Correct. Which I've been told is equivalent to 60,000 BTUs.

    - - - Updated - - -

    Quote Originally Posted by Scott Patterson View Post
    Any of the photo electric type detectors that can be mounted on walls or ceilings. They detect a smoldering fire better which produce more CO.
    Conventional smoke alarms are not required in commercial buildings without a fire protection system.

    Joe Funderburk, CBO, CMI
    Alpha & Omega Home Inspections, LLC
    Serving SC & NC

  13. #13
    Join Date
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    NY Finger Lakes Area
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    Default Re: What is this duct mounted gizmo?

    Quote Originally Posted by Jim Luttrall View Post
    Ok, makes sense. Kind of weird they had it only on two of the 4 systems though.
    New construction of a 5000' Doctors office with full alarm and sprinkler system. I did call for it to be cleaned off and serviced since the filters were full of sheet rock dust and this sensor was before the filter.
    Thanks Guys!
    ...........if the building has any procedure rooms, the two units with detectors are supply units and the other two units may be the return (exhaust ) units. Pretty common to have 100% fresh-air systems in medical facilities..........Greg.


  14. #14
    Join Date
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    Default Re: What is this duct mounted gizmo?

    Quote Originally Posted by Gregory Booth View Post
    ...........if the building has any procedure rooms, the two units with detectors are supply units and the other two units may be the return (exhaust ) units. Pretty common to have 100% fresh-air systems in medical facilities..........Greg.
    They did have the procedure rooms on a separate system but all are typical units of the same size.
    The smoke detectors were on the units which served the office and waiting area as well as the proceedure rooms.

    Jim Luttrall
    www.MrInspector.net
    Plano, Texas

  15. #15
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    Default Re: What is this duct mounted gizmo?

    2012 IMC (does not apply to residential buildings-1 and 2 family dwellings)

    DETECTION SYSTEMS CONTROL

    606.1 Controls required. Air distribution systems shall be
    equipped with smoke detectors listed and labeled for installation
    in air distribution systems, as required by this section.
    Duct smoke detectors shall comply with UL 268A. Other
    smoke detectors shall comply with UL 268.

    606.2 Where required. Smoke detectors shall be installed
    where indicated in Sections 606.2.1 through 606.2.3.
    Exception: Smoke detectors shall not be required where
    air distribution systems are incapable of spreading smoke
    beyond the enclosing walls, floors and ceilings of the
    room or space in which the smoke is generated.

    606.2.1 Return air systems. Smoke detectors shall be
    installed in return air systems with a design capacity
    greater than 2,000 cfm (0.9 m3/s), in the return air duct or
    plenum upstream of any filters, exhaust air connections,
    outdoor air connections, or decontamination equipment
    and appliances.


    Exception: Smoke detectors are not required in the
    return air system where all portions of the building
    served by the air distribution system are protected by
    area smoke detectors connected to a fire alarm system
    in accordance with the International Fire Code. The
    area smoke detection system shall comply with Section
    606.4.

    Joe Funderburk, CBO, CMI
    Alpha & Omega Home Inspections, LLC
    Serving SC & NC

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