NFPA 96 1

[IBechir]

Greetings

For grease (kitchen exhaust) ducts, can intumescent coating be used on the outside of of the duct instead duct wraps like Fyrewrap? How much clearance to combustibles will be required if that is the case? This is for compliance with NFPA 96.

Much obliged for any information.

 

[cdafd]

Have to look at. 96. More than likely No!!!

 

[fireguy519345]

There is no mention of intumescent coating in 96. Are there any intumescent coatings that meet the requirements?

 

[IBechir]

No, there is no mention in 96 for Intumenescent paints. But ducts with these paints are tested for fires inside and on the outside and are rated for 2 hours. See this link as an example:

http://www.fireduct.ie/Galloway Brochure 6pp.pdf‎

I realize its tested to another standard and I'm not trying to compare standards. Why are these paints not suitable for grease ducts compliance to NFPA 96 as you say?

 

[cdafd]

Would say the shaft or wrap is protecting in case the fire gets out of the duct and not fire attacking the duct

 

[stookeyfpe]

It wouldn't be recognized by most U.S. fire officials because the testing lab is probably not recognized and would be challenged. NFPA 96 doesn't excluded foreign test labs but the data sheet is based on British standards. The fire-resistance requirements in the US are based on ASTM E-119.

Intumescents have other issues like preparation of the substrate, required thickness, quality of the application, skills of the applicator, etc. I wouldn't approve it my jurisdiction unless I was presented with some very compelling information.

 

[IBechir]

Thank you for the information.

 

[chicopee]

You'll have to stick to metal ducts of particular gauges predicated on duct dimensions.