FireMaster FyreWrap® 1. 5 Duct Insulation*

Introduction
FyreWrap® 1.5 Duct Insulation from Unifrax is a high-temperature insulation blanket specifically designed to provide a flexible enclosure for one- and two-hour rated kitchen exhaust ducts and HVAC ducts. FyreWrap 1.5 Duct Insulation provides a tested, alternate fire protective enclosure in lieu of constructing a traditional shaft wall enclosure. FyreWrap 1.5 Duct Insulation offers the following product features:

• High-temperature, biosoluble insulation
• Zero clearance to combustibles
• 1- and 2-hour fire endurance rating
• Lightweight, flexible product form
• Easy to cut, fabricate and install around ducts
• Scrim encapsulated for durability and resistance to grease absorption.

Typical Product Parameters

Typical Product Properties

Installation (2-Hour Fire Rated Grease and Ventilation Ducts):
FyreWrap 1.5 Duct Insulation consists of a two-layer system (total thickness = 3.0") applied directly on to the duct surface. See Figure 1 for details. The first layer of FyreWrap 1.5 Duct Insulation shall be installed so all perimeter and longitudinal seams form butt joints. The second layer of FyreWrap 1.5 is installed with 3" perimeter and 3" longitudinal overlaps. The second-layer joints should be offset from the first-layer joints by a minimum 12". Seal all cut edges with aluminum foil tape. To temporarily secure the insulation, optional use of 1" wide filament tape is permitted. Install the tape 1½" from the blanket edge and approximately 10½" on center. Utilize stainless steel banding to permanently attach the material, placing the banding over the tape in the same locations. Tighten banding to firmly hold the wrap system in place, but not so tight as to cut or damage the blanket. For ducts with spans greater than 24" wide, steel insulation pins shall be welded on the bottom of horizontal ducts and continue on the outside of vertical duct rises. Space in columns 12" on center, 6"-12" from each duct edge and 10½" apart. FyreWrap 1.5 is impaled over the pins and held in place with speed clips to keep the system from sagging. Exposed ends of pins shall be bent over to eliminate safety hazards.

Installation (1-Hour Fire Rated Ventilation Ducts):
FyreWrap 1.5 Duct Insulation consists of a single-layer system (total thickness = 1.5") applied directly on to the duct surface. The material shall be installed with a 3" perimeter and 3" longitudinal overlap. Installation guidelines for taping cut edges, banding procedures, pin spacing, etc. remain the same as described above for the two-layer 2-Hour Fire Rated Grease and Ventilation Ducts. See Figure 2 for details.

Figure 1. FyreWrap ® 1.5 Duct Insulation System
ITEM DESCRIPTION

1. TWO LAYERS FYREWRAP® 1.5 DUCT INSULATION
2. FILAMENT TAPE
3. STAINLESS STEEL BANDING
4. 3-INCH OVERLAP (2ND LAYER)
5. BUTT-JOINT (1ST LAYER ONLY)

1. FYREWRAP® 1.5 DUCT INSULATION, ONE LAYER
2. FILAMENT TAPE (TEMPORARY HOLD)
3. SS BANDING STRAPS (PERMANENT HOLD)
4. 3-INCH MINIMUM LONGITUDINAL OVERLAP
5. 3-INCH MINIMUM OVERLAP

Access Door (2-Hour Fire Rated System)
Field fabricated access doors are protected with three layers of FyreWrap 1.5 Duct Insulation. A gasket of 0.5" thick blanket is initially installed between the duct and the access door cover. Weld threaded rod to each corner of the reinforcing frame on the access door opening. Cover with steel sleeves (optional) for easy removal of blanket. Weld at least five steel insulation pins to the outside of the door cover panel, four located 1" from each corner, one at the door cover center and additional pins on maximum 12" centers if appropriate. Cut through the two layers of FyreWrap 1.5 Duct Insulation already wrapping the duct and covering the access door opening. Leave the interior piece in place. Cut back the second layer to form an opening with dimensions 1" greater than the interior piece. Cut a piece of FyreWrap 1.5 that matches the dimensions of the opening created as a result of removing the exterior piece. Install over pins to fit tightly within the material cut away. Cut an additional (third) piece of FyreWrap 1.5 insulation with dimensions 1" wider than the installed pieces covering the access door opening. Install over the insulation pins to form a 1" step joint with the exterior layer. Seal all cut edges and joints with aluminum foil tape. Secure with speed clips (washers) and bend over excess pin lengths to remove safety hazards. Place washers on threaded rod and secure with nuts. Do not install banding over this area. See Figure 3 for details.
Note: For the 1-Hour/1-Layer FyreWrap 1.5 ventilation duct system, a second duct wrap layer is not required. As a result, follow the procedure outlined above to create a two-layer access door cover.

Duct Support
Horizontal duct support systems do not require FyreWrap insulation when constructed using a minimum 0.5" diameter uninsulated all-thread steel rod and 2"x2"x0.25" uninsulated steel angle, spaced a maximum of 60" on center along the length of the duct. A minimum clearance of 2" is required between the protected duct and the steel rod. For all other duct support configurations, a single layer of FyreWrap 1.5 Duct Insulation is required on all components. Utilize a minimum 3" overlap (approx. ¼ turn) on all joints.

Firestop System
Where ducts insulated with FyreWrap 1.5 pass through fire-rated walls and floors, the penetration opening shall be firestopped to maintain the fire rating of the assembly. FyrePutty® Firestop System: Tightly wrap 12" wide stainless steel mesh around the exterior layer of FyreWrap 1.5 where it passes through the floor or wall; include a 1" overlap. Temporarily secure in place with stainless steel tie wire and permanently with stainless steel banding or worm drive banding. Space banding 4" on center. Firmly pack unfaced FyreWrap 1.5 to a depth of 3½" in the opening to fill the annular space between the wrap insulation and the periphery of the opening. Recess the blanket 1" from the floor or both surfaces of the wall. Apply FyrePutty firestop on top of the FyreWrap 1.5 unfaced blanket within the annular space to a depth of 1". Install firestop symmetrically within the firestop annular space on both sides of wall. Install an additional ½" crown around the wrapped duct and lapping 1 /2" beyond the periphery of the opening.

Figure 3. Access Door Opening
ITEM DESCRIPTION

1. ACCESS DOOR OPENING
2. ACCESS COVER
3. ALL THREAD RODS – (4) WELDED TO GREASE DUCT
4. 1ST LAYER FYREWRAP ® 1.5
5. 2ND LAYER FYREWRAP ® 1.5 – 1" OVERLAP
6. 3RD LAYER FYREWRAP ® 1.5 – 1" OVERLAP
7. WING NUTS & WASHERS
8. ALUMINUM TAPE ALL EDGES
9. INSULATION PINS

1. GREASE DUCT, 16 GAUGE
2. 2 LAYERS FYREWRAP INSULATION, EACH 1.5"
3. MINERAL WOOL (NOMINAL 4 pcf) 4-1/4" DEPTH
4. GE SILICONE PENSIL 300, 1/4" DEPTH
5. 4.5" REINFORCED LIGHTWEIGHT CONCRETE FLOOR SLAB

GE Pensil Silicone Firestop System: The annular space on each side of the wrapped duct shall be a maximum of 1" with the duct centered in the opening. Tightly pack nominal 4lb/ft 3 mineral wool (cut into strips approximately 0.5" thick, rolled tightly and inserted lengthwise) into the annular space so that the material is flush with the underside of the floor and recessed 0.25" from the top surface. Install GE Silicone Pensil 300 fully covering the mineral wool to a depth of 0.25". See Figure 5 for details.

Additional UL and OPL Tested and Listed Firestop Systems are permitted for use with FyreWrap 1.5, utilizing firestop products readily available in the market. Contact Unifrax Corporation Application Engineering at 716/278-3888 for details and assistance.