What Are Fire Wraps & What Are They Used For?

A fire wrap is a fire-resistant, non-combustible, flexible, high-temperature insulation blanket installed around metal ductwork as part of a fire-rated enclosure system. It creates a passive fire-resistive barrier (typically 1-2 hours) on ductwork to prevent the spread of fire, smoke, heat, and toxic gases throughout a building.

Instead of “actively” detecting or extinguishing flames (like sprinklers or alarms), passive fire protection focuses on containing fire and heat long enough to support safe evacuation and maintain the system’s integrity.

Fire wrap is often required for commercial kitchen grease ducts (where grease can ignite and burn intensely), exhaust ducts, and dryer vents. It is critical to follow each manufacturer’s installation instructions as fire wraps are listed as a complete, specific assembly; changing details during installation, like layer count, fastening, overlaps, or penetration treatments, can compromise the system’s rated performance.

How Are Ductmate Access Doors Used With Fire Wraps?

Ductmate does not make or sell fire wrap; however, it is commonly used with several of our access doors, including our ULtimate™ doors and the F1 and F2 doors, which are referenced in many International Code Council (ICC) Evaluation Service Reports for major fire wrap manufacturers. These doors are designed and engineered to meet or exceed all applicable standards and to ensure ease of use with fire wrap.

ULtimate Doors

Both the ULtimate Door and ULtimate Door II can be purchased with insulation kits specifically designed to allow our doors to be used with fire wrap or can be purchased separately. The kit includes the ULtimate door, extension bolts, and an outer plate. The extension bolts, which are roughly 6”, allow the fire wrap to slide over the bolts and connect the access door to the outer plate. The outer plate encapsulates the insulation over the access door, protecting the integrity of the access point and identifying the access point for duct cleaners and fire departments.

Ductmate does not offer insulation kits for the ULtimate Door Round due to the different diameter options. However, extension bolts and outer plates are still available separately.

Custom outer plates are made using a formula that helps us determine the exact diameter needed for the outer plate:

Insulation thickness x number of layers x 2 + duct diameter. (Ex: Diameter of the duct is 14” using 3 layers of 1.5” insulation. (1.5”x3) x 2+14” = 23” outer plate.)

If you need assistance calculating the diameter of the outer plate, please contact Ductmate Customer Service, and they will be happy to assist you.

F1 & F2 Doors

Ductmate’s F1 High-Temperature and F2 Grease Duct doors are also commonly used with fire wrap. These doors can be ordered with modified bolts, either 4” or 6”, to help accept the fire wrap. We do not provide outer plates for these doors; however, they are commonly made in the field with extra sheet metal.

If you are installing our doors with a fire wrap system, please be sure to specify when placing your order to ensure that you receive the correct doors that will allow for easy installation. For more information, consult Ductmate Customer Service.

Ready to Buy?

Ductmate products are available at over 350 locations across the US as part of a selective distribution network.  Use the Ductmate distributor locator map to find a distributor near you.

Outside the US? Check out our international distributor list.  For detailed information on product availability, lead times, or other international sales requests, please email ductmate@ductmate.com.

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