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Hilti Firestop Systems
Sheet
Drawing No.
HILTI, Inc.
Date
Scale
Saving Lives through Innovation and Education
NOTES : 1. MAXIMUM SIZE OF OPENING = 31-1/8" x 31-3/8".
2. ANNULAR SPACE = MINIMUM 1/4", MAXIMUM 1-1/8".
3. FASTEN STEEL ANGLE (1-1/2" x 1-1/2" x MIN. 20 GA.) TO DUCT WITH NO. 10
SHEET METAL SCREWS SPACED MAXIMUM 1" FROM ENDS AND MAXIMUM 6" OC.
ANGLES TO BE SECURELY ATTACHED TO STEEL DUCT A MAXIMUM 4" FROM
WALL SURFACES ON BOTH SIDES OF GYPSUM WALL ASSEMBLY.
1. GYPSUM WALL ASSEMBLY (UL/cUL CLASSIFIED U400, V400, OR W400 SERIES) (1-HR. OR 2-HR.
FIRE-RATING) (2-HR. SHOWN).
2. STEEL STUDS TO BE MINIMUM 3-1/2" WIDE. OPENING TO BE FRAMED OUT WITH STUD MATERIAL.
3. PENETRATING ITEM TO CONSIST OF ONE OF THE FOLLOWING :
A. MAXIMUM 30" x 30" RECTANGULAR SHEET METAL DUCT (MIN. 24 GA.).
B. MAXIMUM 30" x 30" RECTANGULAR SHEET METAL DUCT (MIN. 24 GA.) WITH BW11 COATING
MATERIAL (FLAMEBAR BW11 FIRE RATED DUCTWORK BY FIRESPRAY INTERNATIONAL, LTD.).
4. MINERAL WOOL (MIN. 4 PCF DENSITY) TIGHTLY PACKED AND RECESSED TO ACCOMMODATE
SEALANT. MINIMUM 3-1/2" OR 4-3/4" THICKNESS REQUIRED FOR 1-HR. OR 2-HR, RESPECTIVELY.
5. MINIMUM 5/8" DEPTH HILTI FS-ONE MAX INTUMESCENT FIRESTOP SEALANT.
6. STEEL RETAINING ANGLES (SEE NOTE NO. 3 BELOW).
WL
7250c
1 of 1
1/16" = 1"
Jan. 30, 2018
UL/cUL SYSTEM NO. W-L-7250
F-RATING = 1-HR. OR 2-HR.
T-RATING = 0-HR. OR 3/4-HR.
L-RATING AT AMBIENT = LESS THAN 1 CFM / SQ FT
L-RATING AT 400°F = LESS THAN 1 CFM / SQ FT
WL7250c.013018
SHEET METAL DUCT (WITHOUT DAMPER) THROUGH GYPSUM ASSEMBLY
A
SECTION A-A
FRONT VIEW
Plano, Texas USA (800) 879-8000
MAX. 6" C/C SPACING
(SEE NOTE NO. 3 BELOW)
A
1
3
6
2
MAX. 4"
5
4