View Full Version : Fire Damper For BARD units?
01-12-2006, 10:48 PM
If a Bard wall hanger is placed on a fire rated wall, then the ducts must have a fire damper according to NFPA 90A 220.127.116.11 right?
If I have to put in a fire damper, do they make one that can be used in a space that tight?
Am I missing something here?
01-15-2006, 10:17 AM
I saw that no one responded to this and thought I would give my two cents....Why would you use a Bard on anything but a trailer anyway, especially on a fire rated wall?
01-15-2006, 11:31 AM
Does the unit serve more than one room? I thought that if the unit couldn't feed fresh air to an existing fire or smoke situation between rooms that all was needed was a shut down relay activated by the fire or smoke control.
01-15-2006, 03:30 PM
1 Hour or 2 hour wall?
What does the AHJ say?
Smoke wall also? Don't have info at home but will check Monday if you let me know.
01-15-2006, 06:10 PM
It is an outside wall on a cell phone antenna equipment room. It specs out for BARD units only, so I really have no choice but to use BARD.
01-15-2006, 06:33 PM
have seen bards in a lot of satelite phone applications and none ever had a fire damper. just a basic hang job with hole cut for OA and ductwork to space. If anything maybe as mentioned earlier---a detector to shut the fan off.
Anything under 2000 cfm I think it is doesn't require any detector.
01-15-2006, 10:23 PM
Am I mis-reading NFPA 90A 18.104.22.168?
01-16-2006, 08:51 AM
Ive serviced and installed dozens of Bard and Marvair on
these cell tower structures and have never seen a fire damper requirement. I dont remember ever seing a F.D.in an
outside wall of any building.You should contact your local
fire marshel or code inforcers and get clearification. Thats my 2 cents
01-16-2006, 11:35 AM
I am doing three Bard units with fire dampers now. The application is cooling for elevator equipment rooms in a below grade parking garage. The mounting walls are a 2-hour rate. We have fire dampers in proper sleeves in CMU walls. No duct just grilles on inside of machine room.
01-16-2006, 12:28 PM
Check with the General Contractor or the architect to confirm why the wall is "rated". In most instances exterior walls (where the bard unit will go) match the rating of the structure based on the occupancy and use group. Unless you're within 10' of a property line or something else extreme you usually wouldn't need a fire damper.
Like the elevator room example - that's something different where the code requires rated walls and protected penetrations to a elevator machine room.
I've asked local plan examiners if the architect plans show a fire wall but it's not required by code they told me they would NEVER mention it to the architect. They love it when the architect and contractor build above the code minimum. It's possible the plans or the contractor prefer the construction method of the wall and it just so happens to be rated and they labelled as such.
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