A quick search on Google and I found this link. Looks like Indiana may have different regs per county. You should find this document for your county and give them a call.
Brian Sweeney - CBJ #3691 - '77 Step Van Mobile Kitchen, Horizon Marshall, WSM with Pro Q Stacker, Weber Kettle & Smokey Joe GOLD.
"Any sufficiently advanced technology is indistinguishable from magic" - Clarke's Third Law