This material was extracted and drawn by 3M Fire Protection Products from the 2010 edition of the UL Fire Resistance Directory.
3Fire Protection Products
www.3m.com/firestop
W-L-3372 • 1 of 1
Product Support Line
1-800-328-1687
3000 Series
Gypsum
1. Wall Assembly – The 3 or 4 hr fire rated gypsum board/stud wall assembly shall be constructed of the materials and in the manner specified
in the individual U300 or U400 Series Wall and Partition Designs in the UL Fire Resistance Directory and shall include the following
construction features:
A. Studs – Wall framing may consist of either wood studs or steel channel studs. Wood studs to consist of nom 2 by 4 in. (51 by 102 mm)
lumber spaced 16 in. (406 mm) OC. Steel studs to be min 3-1/2 in. (89 mm) wide and spaced max 18 in.(457 mm) OC.
B. Gypsum Board* – 5/8 in.(16 mm) thick, The gypsum board type, thickness, number of layers, fastener type and sheet orientation shall be
as specified in the individual U300 or U400 Series Design in the UL Fire Resistance Directory. Max diam of opening is 6-1/2 in.(165 mm).
The hourly F Rating of the firestop system is equal to the hourly fire rating of the wall assembly in which it is installed.
2. Cables – Aggregate cross-sectional area of cables in steel sleeve to be 48 percent of the aggregate cross-sectional area of the sleeve. The annular
space between cables and periphery of sleeve and the annular space between cables shall be min 0 in. (point contact) to max 2 in. (51mm).
Cables to be rigidly supported on both sides of wall assembly. Any combination of the following types and sizes of cables may be used:
A. Max 400 pair No. 24 AWG (or smaller) copper conductor with polyvinyl chloride (PVC) insulation and jacketing material.
B. Max 1/C No. 750 kcmil (or smaller) copper conductor cable with cross-linked polyethylene (XLPE) jacket.
C. Max 7/C No. 12 AWG (or smaller) copper conductor power and control cables with XLPE or PVC insulation with XLPE or PVC jacket.
D. Max 3/C No. 4/0 AWG (or smaller) copper or aluminum conductor SER cables with PVC insulation and jacket.
E. Max 110/125 fiber optic (F.O.) cable with PVC insulation and jacket.
F. Max 3/C with ground No. 8 AWG (or smaller) copper conductor NM cable with PVC insulation and jacket.
G. Max No. 18 AWG RG/U coaxial cable with fluorinated ethylene (FE) or PVC insulation and jacket.
H. Max 4 pair No. 24 AWG (or smaller) copper conductor data cable with Hylar jacket and insulation.
I. Max 4 Pair No 22 AWG (or smaller) Cat 6 copper conductor with PVC insulation and jacket
J. Max 3/C No. 2/0 AWG (or smaller) aluminum or copper conductor cable with XLPE insulation and PVC jacket.
K. Max 3/C No. 2/0 aluminum or copper SE cable with PVC insulation and jacket.
3. Firestop system – The firestop system shall consist of the following:
A. Firestop Device* – One firestop device module centered within the opening. The firestop device module consists of a 12 in. (305 mm)
long galv steel. Firestop device module to be installed in accordance with the accompanying installation instructions. The space between
the firestop device module and the periphery of the opening shall be min 0 in. (0 mm, point contact) to max 1 in. (25 mm). Firestop
device module secured in place by means of steel restraint plates sized to accommodate the firestop device module. Steel restraint plate
installed on both sides of floor or wall and secured around firestop device module with steel screws. The steel restraining plate is then
secured to both sides of the wall assembly with the supplied screws. The firestop device module is to be installed with its ends projecting
an equal distance beyond each surface of the wall assembly.
3M COMPANY
3M FIRE PROTECTION PRODUCTS – 3M Fire Barrier Putty Sleeve Kit DT 100, DT 200 or DT 400
B. Packing Material – Min 2 in. (51 mm) thickness of min 4.0 pcf (64 kg/m3) mineral wool batt insulation firmly packed into top end of
sleeve (Item 2A) as a permanent form. Packing material to be recessed from top end of sleeve to accommodate the required thickness of
fill material.
C. Fill, Void or Cavity Material – After the installation of the cables (Item 2) the supplied putty material is to be packed into each end of
the firestop device with care taken to fill the interstices between the cables. A minimum depth of 1 in. (25mm) is required for the putty
material at each end of device.
3M COMPANY
3M FIRE PROTECTION PRODUCTS – 3M Fire Barrier MP+ Putty stix
*Bearing the UL Classification Mark
+Bearing the UL Listing Mark
WL
March 18, 2010
F Ratings – 3 and 4 Hr (See Item 1)
T Rating – 1/2 Hr
Cables
Through Penetrations
System No. W-L-3372