I would probably be interested in it depending on what impulse range it is in.
Does the average thrust of no more than 80N NFPA reg apply ?
Need to know more info other than just "exempt"

If it is some non-combustible nonsense, NOT interested.

__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !