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GENERAL INSTALLATION METHOD
Grease & 2-hour Ventilation Air Duct Systems
Two-layers of CL4FIRE™ ductwrap constructed as follows:
- First Layer installation allows snugly
fitted butt seams throughout. (minimum 1/2" joint compression)
- Second Layer installed with snugly fitted
seams staggered joint between the first and second layers by
a minimum of 6".
- When encountering ductwork flanges it is not required
to have the 1st layer of CL4FIRE™ ductwrap cover the
top of the flange. It is only required that ductwork flange locations
have the 1st layer of CL4FIRE Ductwrap insulation
snugly butted against both sides of the flange.
- 3" Overlaps can be substituted
for butt-seams if desired
- For 2 or 3-sided systems see CL4FIRE™ Ductwrap
“2 or 3” sided Pinning Only Method or alternately “2 or
3” Sided Banding Method.
1-hour Ventilation Air Duct Systems
- For one hour Ventilation Air Duct Systems, only
one layer of CL4FIRE™ Ductwrap insulation is required using a 3" overlap
at seaming locations.
Grease Duct System
- Maximum 36" x 36" (1296
sq. inch) - Rectangular, Square, or Round #16 Gauge Grease
Duct assembly installed per NFPA-96 guidelines in accordance
with applicable building code requirements.
Note: CL4 Inc. requests a review for ductwork larger than indicated to help ensure installation integrity.
Ventilation Air Duct System
- Maximum Dimension 54" Rectangular,
Square, or Max 1296 sq. inch Round #22 Gauge or Greater Air
Duct Assembly rated for maximum 300 Pa negative pressure within
the duct.
- Complying with SMACNA or NFPA 90A requirements.
Note: CL4 Inc. insists
on reviewing ductwork installation details for ducts larger than
indicated to help ensure product installation appropriateness & integrity
Support Rods & Cradles
- Minimum 3/8" steel threaded rod & 1-1/2" x
1-1/2" x
3/16" steel angle cradles for ductwork up to 160 sq. inches
in size
- Minimum 1/2" steel threaded rod & 2" x 2" x 1/4" steel
angle cradles for ductwork greater than 160 sq. inches in size
- Support rods to be anchored to concrete
using pass thru method with a nut & washer on the top of
the concrete slab, or by using suitable carbon or stainless
steel masonry anchors penetrating a minimum 2" depth into the
concrete slab
- Maximum distance of 60" allowed
between non-insulated duct supports
Note: If desired, it is acceptable to encase the cradle
support assembly along with the duct within the CL4Fire Ductwrap
insulation (i.e.: cocoon wrap) during the installation. A slit
is allowed in the duct wrap in order to position around the
threaded rod. Slit must be repaired and sealed using a minimum
depth of 1/4" with
a bead also placed around the circumference of the support
rod. Seams can be sealed using any combination of the approved
installation methods.
Banding (not required with “Pinning Only” method):
- 1/2" stainless steel banding for
grease duct and 2-hour ventilation air duct systems installed
as outlined in CL4Fire Ductwrap installation Methods
- 1/2" wide carbon steel banding for Grease Ducts and
ventilation air duct systems requiring only a 1-hour ‘external’
fire rating
Note: Grease ductwork always requires 2-layers of
CL4FIRE Ductwrap Insulation.
Firestop:
- Minimum 4" depth of 4 pcf (or heavier) mineral wool insulation
or CL4Fire Ductwrap fiber firmly packed into 1 or 2-hour rated
concrete
- Full depth of mineral wool or CL4FIRE fiber (less caulking
depth) into framed gypsum wall or framed wood floor/gypsum
ceiling
- Assemblies are to be topped with Hilti FS One Sealant to
a min. depth of 1/4" on top of floor or both sides of
wall assembly
- Maximum annular space of 4" between duct and floor or
wall substrate is allowed
- See Intertek Testing Services (ITS)
listing CL4/PHV 120-01 for additional firestop details
Gypsum Shaft Transition (if required):
- Should a transition be required from
a gypsum shaft system to a CL4FIRE Ductwrap installation
the annular space around the duct and the shaft must be filled
with a minimum of 4" depth
of CL4FIRE insulation and topped with a 1/4" depth of
HILTI FS ONE SEALANT flush with the surface of the gypsum
- No aluminum tape is required on seams, but it may be used
for cosmetic reasons if desired
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