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Sheet
Drawing No.
HILTI, Inc.
Date
Scale
Saving Lives through Innovation and Education
WJ
2 of 2
-
UL/cUL SYSTEM NO. W-J-7112
INSULATED SHEET METAL DUCT THROUGH CONCRETE OR CONCRETE BLOCK WALL
Hilti Firestop Systems
Tulsa, Oklahoma USA (800) 879-8000
1. CONCRETE WALL ASSEMBLY (2-HR. FIRE-RATING) :
A. LIGHTWEIGHT OR NORMAL WEIGHT CONCRETE WALL (MINIMUM 6" THICK).
B. ANY UL/cUL CLASSIFIED CONCRETE BLOCK WALL.
2. MAXIMUM 100" x 100" RECTANGULAR SHEET METAL DUCT (CONSTRUCTED AND REINFORCED IN
ACCORDANCE WITH SMACNA CONSTRUCTION STANDARDS).
3. NOMINAL 1-1/2" OR 2" THICKNESS GLASS-FIBER DUCT INSULATION (MIN. 3/4 PCF) WITH
FOIL-SCRIM-KRAFT FACING. INSULATION TO BE SPLIT TO ALLOW STEEL ANGLE TO BE FASTENED
DIRECTLY TO DUCT (SEE TABLE AND NOTE NO. 2 BELOW).
4. MINERAL WOOL (MIN. 4 PCF DENSITY) TIGHTLY PACKED AND RECESSED TO ACCOMMODATE SEALANT.
5. MINIMUM 5/8" DEPTH HILTI FS-ONE MAX OR FS-ONE INTUMESCENT FIRESTOP SEALANT.
6. STEEL RETAINING ANGLE (SEE TABLE AND NOTE NO. 3 BELOW).
NOTES : 1. MAXIMUM SIZE OF OPENING = 105-1/2" x 104".
2. INSULATION TO BE COMPRESSED MINIMUM 50% SUCH THAT THE ANNULAR SPACE =
MINIMUM 1/2", MAXIMUM 3-1/2".
3. AFTER SEALING SPACE BETWEEN DUCT AND WALL ASSEMBLY WITH HILTI FIRESTOP
SEALANT, FASTEN STEEL ANGLE (MIN. 16 GA.) TO DUCT WITH MINIMUM NO. 10 SHEET
METAL SCREWS (SPACED MAXIMUM 1" FROM EACH END OF STEEL DUCT AND SPACED
MAXIMUM 6" C/C). STEEL ANGLE TO OVERLAP DUCT BY MINIMUM 1" AND WALL
ASSEMBLY BY MINIMUM 2". WHEN DUCT DIMENSION DOES NOT EXCEED 48" AND DUCT
AREA DOES NOT EXCEED 1300 SQ. IN., ANGLES MAY BE MIN. 18 GA. ANGLE DOES NOT
HAVE TO BE FASTENED TO WALL ASSEMBLY.
F-RATING = 2-HR.
T-RATING = 0-HR. OR 2-HR.
7112d
Sep. 19, 2018
WJ7112d.091918
MAXIMU
M DUCT
DIMENSI
ON
DUCT
THICKNES
S
MAX.
INSULATION
THICKNESS
(ITEM 4)
ANNULAR
SPACE (MIN. -
MAX.)
PACKING
MATERIAL
(ITEM 5)
REQUIRED
ANGLE
(ITEM 7
REQUIRED)
T-RATING
24 IN. **
24 GA.
(OR
HEAVIER)
1-1/2"
1/4" TO 1"
NO
NO
0
25" BY
45"
24 GA.
(OR
HEAVIER)
2"
1/4" TO 3-1/2"
YES
NO
2 (SAME AS
WALL
RATING