NFPA 68

[nuche1973]

NFPA 68 gives a maximum mass for vent panels as 40 kg/m^2. I am not sure if this is meant to be 40 kg(force)/m^2 or if I need to multiply the number by the acceleration due to gravity. I am designing a vent panel and am having trouble deciphering what is required by the code. I am working in Imperial Units and this value is my limiting factor. Any suggestions, clarifications would be appreciated.

 

[btrueblood]

Convert from weight in lbs. by dividing it by 2.205 to get kg.

 

[nuche1973]

So, then NFPA is talking about kg(force) and we are converting it to pound (avoirdupois), correct? Or do I need to consider the definitions given for Newtons and gravational mass?

 

[MintJulep]

There is no such thing as kg(force). The kg is a unit of mass.

 

[nuche1973]

Not in SI correct, but is used. I just needed a clarification in how NFPA uses it.

 

[Compositepro]

Your original post says mass is 40 kg/m2. There is only one way to interpret that and MintJulep is correct. Why are you confused?