Having been a stove dealer for more than 20 years, I've run into this problem before. UL establishes a standard for stoves to meet for safety considerations. Other accredited labs can then test stoves to this standard. Arnold Green is certainly one of these labs, and your fire marshall should accept this. To require that the stove actually be tested by UL ( a private entity) is bordering on restraint of trade. Hopefully your guy will see this. Black Bart is no longer in business.