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UL standards for fire stop

  1. Q: While reviewing plans for a 180 sq. ft. room containing a 2 hour oor-ceiling assembly, the UL design (L502) indicat- ed that the total area of a duct open- ing in the suspended ceiling cannot exceed 198 sq. in., and the aggregate duct openings cannot exceed_____. per 100 sq. ft. of ceiling area. What size damper can be used in this application?
    99 square inches aggregate duct opening per 100 sq. Ft of ceiling.
  2. In a room 100 sq ft. Of ceiling can have what dimension of duct in the room?
    • In this case, based on the aggregate
    • size restriction, a max. 178.2 sq. in. damper can be provided. As noted in the design it cannot exceed 12 in. in width or 16-1⁄2 in.
    • in length.
  3. What label should be on a fire door?
    The UL label.  Which is often obliterated or removed in the field.  In such cases the UL will field label the door as long as it has not been in use more than a year.
  4. Horizontal butt joints on opposite sides of the studs in single-layer applications should be staggered a minimum of ______in. unless otherwise stated in the individual designs. Horizontal butt joints in adjacent layers on the same face of the assembly in multiple-layer applications should be staggered a minimum of ____in. unless otherwise stated in the individual designs.
    • 12.
    • source: Copyright © material from Issue 1, 2008, The Code Authority newsletter.
    • This material may not reflect changes that have occurred since its original publication.
  5. horizontal butt joints of the vertically applied gypsum board should be backed by the same type studs as speci ed in the design. Alternatively, minimum _______gauge steel framing with a minimum attachment face of _____may be used for the backing.
    • 25 gauge with a minimum attachment face of 1 1/4 inch for horizontal butt joints in gypsum board.
    • Copyright © material from Issue 1, 2008, The Code Authority newsletter.
    • This material may not reflect changes that have occurred since its original publication.
  6. A 100 sq ft room can have how much maximum sq inch of box size without fire outty?
    100 square inches of box can go without fire putty or firestop maximum .
Author
johnbowens
ID
337944
Card Set
UL standards for fire stop
Description
Per the 2017 UL standards
Updated

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