H41 Interceptor™ Hood

H41 Interceptor Hood Flexible I Breathable I Particle Barrier


With DuPont™ Nomex® Nano Flex, the H41 Interceptor™ Fire Hood is designed to block potentially carcinogenic particulates and other harmful contaminants.  
Certified to NFPA 1971, 2013.

More about this product

Product Features

The H41 Interceptor™ Hood is made with a layer of DuPont™ Nomex® Nano Flex inside that acts as a filter to reduce firefighters' exposure to persistent fireground carcinogens and other contaminants. We've used this revolutionary material sewn between two layers of knit 6.0oz PBI®/Lenzing (20%/80%) to provide the maximum performance for particle barrier filtration, comfort, and thermal & flashover protection.

Properties & Benefits
  • Particulate Barrier with Submicron Pores
  • Comfortable, Thin, & Lightweight
  • Very Breathable - High Air Permeability
  • Provides Additional Thermal Insulation
  • Laundry Durable

Scientific Data

The H41 Interceptor™ blocks 95% of particulates at .2 micron in size or larger. For perspective, there are 25,400 microns in one inch and a human hair is about 75-100 microns wide, so a .2 micron particulate is about 500x smaller than a strand of hair. Testing has shown that the particulates sized at less than .2 microns don't have enough mass to make it through the double layer knit and the Nomex® Nano Flex; essentially meaning that this hood blocks 100% of particulates less than .2 microns.

Nomex® Nano Flex is a revolutionary new material that can block fine particulates almost as well as an impermeable membrane. Unlike FR moisture barrier membranes however, this new lightweight (0.5oz/yd2), “barely-there” material is actually completely breathable; Nomex® Nano Flex is a non-woven, web technology, made of submicron continuous fibers.
This data demonstrates how very thin, light, and breathable this material is, while still being able to effectively filter particles:

Nomex Nano Flex comparison chart -nonwoven hoods and those with moisture barriers

The data set to the right demonstrates the remarkable difference in particulate blockage from a standard FR Knit Hood to an FR Knit Hood with Nomex® Nano Flex (measuring from 0.5-0.2 microns).

Additionally, adding Nomex® Nano Flex inside the hood's 2 layers gives the hood nearly a 25% boost in TPP, despite being a mere 0.5 oz/yd2.

H41 Interceptor -Improved Thermal Graph


The Need for a Particle Barrier

The H41 Interceptor™ with Nomex® Nano Flex was designed to keep potentially carcinogenic particulates and other harmful contaminants off of firefighters’ jaws, faces, and necks; areas identified as highly absorptive and more permeable than other areas of skin(1), and are likely not getting enough protection from hazardous particles with the FR knit hood technology that is currently available(2).

With the evidence presented in the Firefighter Cancer Support Network Report - that soot and smoke particles readily absorb and hold liquid and gaseous chemicals (such as the carcinogens and toxins shown to be released in modern house fires), that these "ultrafine particles... [are] absorbed through the skin traveling to most organs including the brain"(1), and knowing that firefighters have a “significantly increased risk… for a number of cancers”(1) - it's becoming apparent that our first responders need to be protecting their skin from soot and smoke, just as much as their lungs.

The FAST Test Report demonstrated that particles at 2.5 micron size penetrated the standard FR knit hood (soot and smoke particles are usually 1 micron or less) and left a concentrated, heavy deposit on the subject’s neck, cheeks, ears and jaw(2). The images on this page are from that study.

Fluorescent Aerosol Screening Test (FAST)
Test Report, Prepared by RTI International, Sponsored by International Association of Fire Fighters

BEFORE (Pre-Test Blacklight Photos) (2)

Fluorescent Aerosol Screening Test (FAST)
Test Report, Prepared by RTI International, Sponsored by International Association of Fire Fighters

AFTER (Post-Aerosol Particulate Exposure) (2)

(1) "Taking Action Against Cancer in the Fire Service", Firefighter Cancer Support Network, August 2013, http://www.firefightercancersupport.org/wp-content/uploads/2013/08/Taking-Action-against-Cancer-in-the-Fire-Service.pdf
(2) "Fluorescent Aerosol Screening Test (FAST) Test Report", Commissioned by the International Association of Firefighters (IAFF), conducted by Research Testing Institute (RTI), January 2015, https://firesmoke.org/wp-content/uploads/2017/01/Fluorescent-_Aerosol_Screening_Test.pdf

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