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STANDARD INSTALLATION METHOD


Installation:
  • Requires two (2) layers of CL4FIRE ductwrap insulation in accordance with standard joint installation instructions for all grease duct & 2-hour ventilation air duct systems
  • Only single layer of CL4FIRE Ductwrap with snugly fitted joints is required for 1-hour ventilation air duct systems
  • All cut ends of insulation to be repaired with aluminum tape
  • Longitudinal seams on 2nd layer to overlap
  • Longitudinal seams on 1st layer by minimum of 6"
  • Circumferential seam of 2nd layer of ductwrap to overlap circumferential seam of 1st layer by 6" minimum
  • 1st and 2nd layer seams installed either by snugly fitting the seams together or by sealing any maximum 1/4" wide voids in the insulation seams with minimum of 1/2" depth of HILTI FS ONE SEALANT.
  • Pinning is required on the underside of the 2nd layer CL4FIRE exposed ductwork joints for ducts exceeding 24" in width. Pins are required within 1-1/2" from both sides of CL4FIRE Ductwrap longitudinal seam. Pinning is not required for ducts up to a maximum 36" in diameter or width if all layers of ductwrap are banded.
  • Additional pins may be added to increase the integrity of the installation
  • Center pins between steel banding with a 12" maximum distance between pins on the bottom of the ductwork and maximum of 12" between the side of the duct and the first row of pins.

    Note: Maximum 18" space is allowed between the edge of the duct and the first row of pins when not located on the bottom side of a horizontal duct.

Detail when longitudinal seam located on bottom of duct

  • 1/8" copper coated steel insulation pins or Cup-Head Weldpins® required to be stud welded on bottom side of a horizontal duct equal to or exceeding 24" width. Pins are to be located a maximum 8" from edge of duct and on maximum 12" centers in 2 rows per 24" wide exterior CL4FIRE ductwrap section. Pins are centered between banding on each individual wrap section. See standard installation method pinning detail
  • Note: No pins are required between the circumference seaming bands other than at the longitudinal joint. Additional pins may be installed to enhance the integrity of the CL4Fire ductwrap installation.
  • Pins are also required on widest side of a vertical duct exceeding 24" in width
  • Maximum pin-free space of 18" in from edge of ductwork is allowed
  • CL4FIRE ductwrap is impaled on pins and held in place with speed clips. Alternately, ductwrap may be installed prior to pinning with Cup-Head Weldpins®
  • Longitudinal seams on the outside layer of wrap material require CL4FIRE Pinning Only pins or a double row of Cup-Head Weldpins® located 1-1/2" on both sides of the seam (3" apart) midway between the banding on each individual exterior wrap section – see “bottom pinning” detail
  • CL4FIRE ductwrap is held in place by banding the second layer of insulation around the duct approx. 1-1/2" on both sides of the seam and in the center of each external wrap layer
  • No aluminum tape is required on seams, but it may be used for cosmetic reasons if desired
  • Filament tape may be used around the first layer to hold the material in place while applying the second layer

The recommended sizes Cup-Head Weldpins® to be used:

  • 1-layer CL4FIRE ductwrap – 1-1/2"
  • 2-layers CL4FIRE ductwrap – 3"

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INSTALLATION
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