Unifrax’s FyreWrap® Elite® 1.5 Duct Insulation is a two-layer flexible enclosure for two-hour rated commercial kitchen grease ducts. This flexible fire protection duct wrap meets the requirements defined by the International Mechanical Code (IMC), Uniform Mechanical Code (UMC), and the National Fire Protection Association (NFPA 96), and is an alternative traditional fire-rated shaftwall enclosure around ducts.


Unifrax’s FyreWrap® Elite 1.5 Duct Insulation is a high temperature blanket system specifically designed to provide a two hour fire rated enclosure for kitchen exhaust (grease) ducts. It is tested per ASTM E2336 and is acceptable as an alternate to a traditional fire-rated shaft. Installed as a two-layer system, FyreWrap Elite 1.5 complies with the International Mechanical Code (IMC) and Uniform Mechanical Code (UMC).

FyreWrap Elite 1.5 Duct Insulation offers the following product features:

  • 2-hour fire-resistance rating
  • Alternate to shaft enclosure
  • Complies with IMC and UMC
  • Tested per ASTM E2336
  • Two-layer system; inner layer utilizes butt joint
  • High-temperature, biosoluble insulation
  • Zero clearance to combustibles, at any location
  • GREENGUARD listed for Microbial Resistance



Specifications on various FyreWrap® Duct Insulation systems are available in several formats, which are listed below:

Submittal Sheets

Contractor submittal sheets for various Fyrewrap® products/systems are listed below:

Listings and Certifications

Description Test Standards (.pdf)
General Grease Duct Assembly ASTM E2336 UNI BI 120-02
General Grease Duct Assembly CAN/ULC S144 UNI-BI 120-03
Through Penetration Fire Stop System-Horizontal Duct ASTM E814 UNI FRD 120-19
Non-bearing Wall ASTM E119 UNI WA 120-01
ICC-ES Evlauation Report ESR-2224 ESR-2224
Surface Burning Characteristics ASTM E84, UL 723 UL File R14514

ICC-ES evaluation reports provide evidence that products and systems meet code requirements. A copy of the Evaluation Report issued by ICC-ES is available for FyreWrap® Duct Insulation Systems as a PDF in the table above or it can be downloaded directly from the ICC-ES website.


Description (.pdf) (.dwg)
General Installation Detail FP-421 FP-421
Access Door System FP-426 FP-426
Through Penetration Firestop System-Wall FP-429 FP-429
Typical Duct Support Details FP-625 FP-625
Through Penetration Firestop Systems-Wall FP-690 FP-690
Through Penetration Firestop Systems-Floor/Ceiling FP-691 FP-691
General Installation Detail (Max. 24″ x 24″ Duct) FP-693 FP-693

Canadian Documentation

FyreWrap products are listed and labeled for the Canadian market and comply with the National Building Code of Canada and required fire test standards.

FyreWrap documentation specifically for Canada is listed below.


Refer to the product Safety Data Sheet (SDS) for recommended work practices and other product safety information.

For additional information on products, properties and performance, typical applications, or to identify the recommended product for your application, see the product information sheet listed above or contact the Unifrax Fire Protection Application Engineering Department at +91 22 2921 2200.