FloAire Pyroscat Enclosure - Manual (Page 6)

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Page 5 P029_02:2014
Fire Rated Enclosure
Installation Technique and Design
Advisory Manual
General
Cut edges of the blanket shall be taped with aluminum foil tape
to prevent exposed edges of the insulation absorbing grease and
moisture in the event of a compromised grease duct joint or
condensation. Overlaps and/or tightly butted joints are used to
block heat transfer in the event of duct deformation resulting from
thermal expansion. Filament tape is suggested to hold the
blanket in place until steel banding or pinning is installed to
permanently secure the blanket.
A. Installation on Grease Duct per ASTM E2336 and CAN/ULC
S144 (Figure 1)
System requires two layers of insulation applied directly to the
duct with tight butt joints at all seams on both layers. The first
layer of insulation is cut to a length sufficient to wrap around the
duct and provide a tight butt joint where the blanket ends meet.
Adjacent blankets on the first layer are butted tightly together with
longitudinal seams offset minimum 6” (150mm). The second layer
of insulation is installed in the same method as the first layer, with
seams between layers offset a minimum of 6” (150mm). Banding
and/or pinning per Section D is used to permanently secure the
insulation to the duct.
B. Installation on HVAC Duct per ISO 6944 (Figure 1)
System requires one layer of insulation applied directly to the duct
with 3” (75mm) overlaps at all seams. The insulation is cut to a
length sufficient to wrap around the duct and provide a 3” (75mm)
overlap where the blanket ends meet. Adjacent blankets are
installed to provide a minimum overlap of 3” (75mm). Banding
and/or pinning per Section D is used to permanently secure the
insulation to the duct.
C. 2 & 3 Sided Wrap Installation (Figure 4)
When space does not allow for a complete wrap applied to the
duct on all four sides, the Pyroscat Duct Wrap XL is approved for
2 or 3 sided installations with mechanical attachment to a rated
concrete or CMU assembly. (See Figure 4 for installation details.)
D. Mechanical Attachment Methods
1) Banding (Figure 1) - Minimum 1/2” (13mm) wide carbon steel
or stainless steel banding, 0.015” (0.4mm) thick, is placed
around the entire perimeter of the insulated duct on maximum
10-1/2” (270mm) centers and 1-1/2” (38mm) from each blanket
edge or 1-1/2” (38mm) from each collar edge when using the
butt joint and collar method. The banding is placed around the
blanket and tightened to firmly hold the Pyroscat Duct Wrap XL
in place against the duct, but not cause any cutting or damage
to the blanket.
2) Pinning - Pinning on all sides of the duct may be used as an
alternative to banding. For ducts wider than 24” (610mm)
pinning is required on the bottom of horizontal runs, or on
one side of vertical runs (in addition to steel banding). When
applicable, 12 Gage (0.4mm) steel pins are installed on 12”
(305mm) centers along the width of the duct and 10-1/2”
(270mm) centers along the length of the duct. Pins that extend
beyond the outer blanket layer shall be turned down or the
excessive length cut off to prevent sharp edges. Shoot
through pins (cup head pins) may be used in conjunction with
steel banding to prevent blanket sag.
E. Access Doors
1) FastDoor™ XL (Figure 3) - FastDoor XL is a UL Listed, liq-
uid tight duct cover panel supplied complete with a single
layer insulation cover per UL Listing HNKT G18. The Fast-
Door XL is installed per
included installation instructions. No field welding is re-
quired.
2) Field Fabricated Access Doors - Each access door assem-
bly has four threaded rods 1/4 inch (6mm) in diameter and 5”
(127mm) in length, with one welded to each corner of the door
opening. Hollow steel tubes, 4-1/2” (114mm) long are installed
outside the access cover plate and over the threaded rods.
Four 12 gage (3mm) and 4-1/2” (114mm) long steel insulation
pins are welded to the access cover plate to allow for installa-
tion of the three layers of Pyroscat Duct Wrap XL. One layer
of
Pyroscat Duct Wrap XL is cut to approximately the same size
as the access panel, and impaled over the insulation pins on
the panel. A second layer of Pyroscat Duct Wrap XL is cut so
as to overlap the first layer a minimum of 1-1/2” (38mm). It is
essential that the first and second layer fit tightly against the
surrounding wrap with no through openings. The third and
outside layer should be cut to overlap the second insulation
layer by a minimum of 1-1/2” (38mm). Minimum 1-1/2” (38mm)
round or square insulation clips are installed on the insulation
pins to secure the three layers of insulation to the access cover
plate. All cut edges of the insulation shall be taped with
minimum 3” (75mm) wide aluminum foil tape. Wing nuts and
washers are installed on the four threaded rods, and tightened
against the hollow steel tubes to seal the access cover plate to
the duct.
F. Through Penetration Firestop System (Figure 2) - When
the duct penetrates a fire rated assembly an approved fire stop
system must be employed. Figure 2 provides a complete list
of
UL / ULC firestop design listings which can be found in the
Certifications Directory at www.ul.com for US systems and
www.ulc.ca for Canadian systems. Prior to installing any
firestop system the surfaces of all openings and penetrating
items must be clean and dry. The Pyroscat Duct Wrap XL
core blanket (or mineral wool where allowed by the firestop
design listing) must be compressed into the annular space.
The packing material must be recessed a minimum depth
from the surface of the concrete or gypsum assembly. The re-
cessed opening must be filled with a minimum thickness of an
approved firestop sealant. The packing material type and
compression, minimum recess (typically 1/4” (6mm)), and
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