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UNIFRAX FYREWRAP ELITE 1.5 INSTALLATION GUIDE
AIR DISTRIBUTION SYSTEMS (ADS)

The FyreWrap Elite 1.5 Duct Insulation consists of a single layer system applied directly on to the duct surface. Only encapsulated blanket should be utilized to ensure the outer surface of the insulation is protected. The insulation system may be installed at zero clearance to combustibles at all locations on the wrap, at material overlaps, and in the field between overlaps. To minimize waste, FyreWrap Elite 1.5 should be rolled out tautly before measuring and making any material cuts. Install insulation with a 3″ minimum overlap on all joints. Seal all cut edges with aluminum foil tape. The transverse overlap of adjacent blanket may be installed using the following three techniques. See Figure 1 for details:

Unifrax Fyrewrap Elite 1.5 Instructions for Installation on Kitchen Exhaust and Grease Ducts

TYPES OF INSTALLATION TECHNIQUES:

1.  Telescoping Overlap Wrap Technique:

This wrap technique is the most common method of installing FyreWrap Elite 1.5 where each adjacent blanket has one edge exposed and one edge covered by the next blanket, to form a 3″ overlap.

2.  Checkerboard Overlap Wrap Technique:

This installation uses a 3″ overlap pattern with both edges of each alternating blanket covered by each adjacent blanket whose edges are exposed. The overlap joints in alternate layers of blanket resemble a checkerboard pattern in the completed installation. This technique is often utilized when a small section of duct wrap must be repaired. 

3.  Butt Splice with Collar Wrap Technique:

This wrap technique permits installation with the blanket edges butted together and a 6″ wide collar of blanket that is centered over the butt splice, overlapping each adjacent blanket 3″. The collar can be field fabricated from FyreWrap Elite 1.5 rolls or purchased separately.

4.  Butt Splice with Pins Wrap Technique:

This wrap technique permits the blanket to be installed with 2″ compression joints at all material seams and no material overlaps. This technique is allowed only when pins are used on all sides of the duct to attach the blanket. Pins shall be spaced in 8″ rows and on 8″ centers. The compression joint is made by overlapping the blanket a minimum two inches. The ends of the blanket are then raised to align the edges, then pushed down together so the ends of the two pieces are under compression and butted together. See Figure 2 for additional details:

Unifrax FyreWrap Elite 1.5 Zero Clearance to Combustibles Butt Joint with Pins Technique

INSTALLATION GUIDES FOR VERTICAL DUCT RUNS:

Vertical Duct Runs

For vertical duct runs, insulation may be applied to the duct in a continuous length parallel to the vertical length of the duct as opposed to wrapping around the duct. All overlaps shall be maintained at a minimum 3″ and are to occur a minimum 6″ from any corner of the duct. Pins spaced a maximum 8″ on center are to be placed at the centerline of all vertically oriented overlaps. Pins may be pre-welded or cup head style pins. See Figure 3 for details:

Unifrax Fyrewrap Elite 1.5 Vertical Duct Run Installation Guide

VERTACLE DUCT RUN INSTALLATION ATTACHMENT OPTIONS:

Three attachment options are available for installers. Choices are limited by the duct width dimension. Details on each option are provided below.

Banding Only: For Duct Widths 24″ or Less

To temporarily secure the insulation, optional use of filament tape is permitted. Place carbon steel or stainless steel bands (min. 1⁄2″ wide, nom. 0.015″ thick) over joints and within the field between joints, around the wrap. Locate bands 11⁄2″ from each edge of the blanket, centered on the overlap, and on 101⁄2″ centers. Tighten banding to firmly hold the wrap system in place but not so tight as to cut or damage the blanket. Pins are NOT required when this banding technique is used.

Banding and Pins: For Duct Widths ≤ 48″

Weld 12-gauge steel insulation pins to the underside of horizontal runs and backside (side of duct having largest dimension) of vertical runs. Place pins at maximum 12″ rows and on maximum 101⁄2″ centers. To temporarily secure the insulation, optional use of filament tape is permitted. Impale FyreWrap Elite 1.5 over the pins and hold in place with 21⁄2″ square galvanized steel speed clips (washers). Turn down or cut off exposed ends of pins to eliminate safety hazards. Locate carbon steel or stainless steel bands (min. 1⁄2″ wide, nom. 0.015″ thick) 11⁄2″ from each edge of the blanket, centered on the overlap, and on 101⁄2″ centers. Tighten banding to firmly hold the wrap system in place but not so tight as to cut or damage the blanket. Cup head style pins are also permitted and shall be located at the same spacing as pre-welded pins.

Pins Only: For Duct Width > 48″

Weld 12-gauge steel insulation pins on all sides of the duct. Place insulation pins in rows (perpendicular to the length of the duct) spaced maximum 101⁄2″ on center. Pins in each row are maximum 6″ from each duct edge and maximum 8″ on center. Locate insulation overlaps so they are centered on the pins. Impale FyreWrap Elite 1.5 over the pins and hold in place with 21⁄2″ square galvanized steel speed clips (washers) to keep the system from sagging. Turn down or cut off exposed ends of pins to eliminate safety hazards. Cup head style pins are also permitted and shall be located at the same spacing as pre-welded pins. The pin only attachment method can be used for duct widths less than 48″, but is optional.

SELECTION GUIDE FOR WHICH VERTICAL DUCT ATTACHMENT METHOD TO USE:

Use the table below to decide which attachment method to use for the size duct you are insulating.

Duct Dimension Banding Only

Banding & Pins (Bottom)

Pins Only (4 Side)

Width ≤ 24"
Width Up to 48"   
Width > 48"      

 

ACCESS DOOR GUIDELINES:

Field fabricated and prefabricated grease duct access doors are permitted for use with FyreWrap Elite 1.5 Duct Insulation.  Installation details are provided below and in Figure 4.

Field fabricated-access doors are protected with two layers of FyreWrap Elite 1.5 Duct Insulation. Cut away the one layer of FyreWrap Elite 1.5 already installed and covering the duct to a dimension that matches the door opening to be used. Mark and cut a clean-out access opening in the duct. Weld 1⁄4 inch dia meter threaded rod to each corner on the access door opening. Cover with hollow steel tubes (optional) for easy removal of blanket. Cut a 16 gauge cover plate with dimensions two inches larger than the opening. Drill holes in the door to match the rod pattern. Use a gasket of 0.5" thick unfaced FyreWrap or ceramic fiber blanket between the duct and the access door cover. Install the cover over the threaded rod overlapping the opening 1" on all sides. Weld at least four steel insulation pins to the outside of the door cover panel, approximately 1" from each corner. Cut a piece of FyreWrap Elite 1.5 that matches the door opening size and install over pins to fit within the insulation area cut away. Cut an additional piece of FyreWrap Elite 1.5 with perimeter dimensions that extend 1" beyond the layer below. Install over the insulation pins. Throughout the installation process, seal all cut edges with aluminum foil tape. Secure with washers and bend over excess pin lengths to eliminate safety hazards. Place washers on threaded rod and secure with nuts. Do not install banding over this area.

Prefabricated – Ductmate Ultimate and Ductmate F2-HT prefabricated access doors are permitted and must be installed in accordance with Ductmate Industries, Inc. installation instructions and the applicable code. The first layer of FyreWrap Elite 1.5 is cut to the size of the door. An additional layer is required and is sized to create an overlap of 1" beyond the lower layer. All edges of insulation blanket must be protected with aluminum foil tape. A No. 16 gauge outer plate the same dimension as the outer layer of insulation blanket is held in place over the insulation using threaded rod and wing nuts. The outer plate is supplied with the Ultimate door and F2-HT door.

Unifrax FyreWrap Access Door System Guide