We are considering to install temperature sensors in the exhaust ducts of a commercial cafeteria's Kitchen to monitor cooking activities through BAS. First of all, does the addition of the sensors (to be installed away from Kitchen hoods, shortly before roof exhaust fans) posts any threat to fire code violation? secondly, can you recommend any temperature sensors rated for such application (hot, smoky, greasy environment)? Typical temperature range? any suggestions or past experience sharing are highly appreciated.