Online Certifications Directory

Fire Rated Assemblies (BXUV)

The summarized form of the test assembly is identified by an alphanumeric design number. The prefix letter designates the group of construction, the first number designates the type of protection and the other numbers and letters identify the particular assembly.

NUMBERING SYSTEM FOR FIRE RATED ASSEMBLIES

	TYPES OF PROTECTION
	Membrane Protection						Direct Applied Protection		Unprotected
Groups of Construction	000-099	100-199	200-299	300-399	400-499	500-599	600-699	700-899	900-999
Floors-Ceilings: A or B* Concrete and Cellular Steel Floor C - Glazing Systems	Concealed Grid Sys.	(Reserved)	Exposed Grid System	(Reserved)	Metal Lath	Gypsum Board	Misc.	SFRM+	Unprotected
D, E, F Concrete and Steel Floor Units	Concealed Grid Sys.	(Reserved)	Exposed Grid System	Mineral and Fiber Boards	Metal Lath	Gypsum Board	Mastic and Intumescent Coatings	SFRM+	Unprotected
G or H* Concrete and Steel Joists	Concealed Grid Sys.	(Reserved)	Exposed Grid System	Mineral and Fiber Boards	Metal Lath	Gypsum Board	Misc.	SFRM+	Unprotected
I Non-load-bearing Horizontal Barrier	(Reserved)	(Reserved)	(Reserved)	(Reserved)	(Reserved)	Gypsum Board	(Reserved)	(Reserved)	(Reserved)
J or K Concrete	Concealed Grid Sys.	(Reserved)	Exposed Grid System	Mineral and Fiber Boards	Metal Lath	Gypsum Board	Misc.	SFRM+	Unprotected
L or M Wood Joist or Combination Wood and Steel Assemblies	Concealed Grid Sys.	(Reserved)	Exposed Grid System	(Reserved)	Metal Lath	Gypsum Board	Misc.	SFRM+	Unprotected
Beams: N or O* for Floor-Ceiling	Concealed Grid Sys.	(Reserved)	Exposed Grid System	Batts and Blankets or Mineral and Fire Boards	Metal Lath	Gypsum Board	Mastic and Intumescent Coatings	SFRM+	Unprotected
Roof-Ceiling: P, Q* or R*	Concealed Grid Sys.	(Reserved)	Exposed Grid System	Mineral and Fiber Boards	Metal Lath	Gypsum Board	Misc.	SFRM+	Unprotected
Beams: S or T* for Roof-Ceiling	Building Units	(Reserved)	Exposed Grid System	Mineral and Fiber Boards	Metal Lath	Gypsum Board	Mastic and Intumescent Coatings	SFRM+	Unprotected
Wall and Partition: U, V or W	Building or Partition Panels Units	(Reserved)	Insulating Concrete	Wood Stud, Gypsum Board, Lath &/or Plaster	Metal Stud, Gypsum Board, Lath &/or Plaster	Misc.	Metal Panels, Gypsum Board, Lath &/or Plaster	SFRM+	Masonry
Columns: X, Y or Z*	Building Units	Prefabricated	Mat Materials	Batts and Blankets or Mineral and Fiber Boards	Metal Lath & Plaster	Gypsum Board	Mastic and Intumescent Coatings	SFRM+	Masonry

The prefix numbers with an asterisk (*) and the design numbers indicated as "Reserved" in the above table are for future expansion and to cater to new types of systems developed in the future.

+ SFRM denotes Spray-Applied Fire Resistive Materials

View the UL Guide Information for Fire Resistance Designs (BXUV).

View the UL Guide Information for Fire Resistance Designs Certified for Canada (BXUV7).

How to use this table to find UL Fire Resistance Design No.:

If you know the exact Fire Resistance Design Number you require, enter this number (e.g., U351, P907, X520) in the available Design No. field and click "Search".

If you do not know the exact Design Number, use the above Numbering System to refine your search options by following these steps:

Choose the type of construction (i.e. column, wall, roof-ceiling, etc) from the first column, "Groups of Constructions". This will determine the alpha component necessary for your search (i.e. A, U, X, etc.)
Follow along the respective row until you find the type of Protection (i.e. gypsum board, SFRM, masonry, unprotected, etc.) applicable to your construction then proceed to the top of that column to obtain the numeric components (range of numbers) necessary for your search (i.e. 400-499, 500-599, etc.).
In the Fire Resistive Design search field, enter the alpha numeric component followed by the first number in the numeric component, then the wildcard * (i.e. U4*, X5*, etc.).
Click Search.
The search results will provide all Fire Resistive Design Numbers in the range provided (i.e. U400 . U499). Choose to view each Design individually by clicking the link in the "Link to File" column or choose to "Refine Your Search"
Refine your search using key words such as 2 hr, vapor barrier, or recessed light.