It is necessary to look behind the filters to change links and check nozzles. To properly inspect a kitchen hood system, the equipment must be off and the fuel shutoff tested. Most systems are inspected before or after normal cooking hours. Check the service date on the system tag. Systems must be inspected every six months.
Tag is punched with the inspection date and expires six months later.
Check the tag carefully and see if any information on the status of compliance of the system is indicated. Many tags have a place for inspected, but not in compliance. The tag may also indicate if system is either a wet or dry chemical. Look at the overall condition of the system. If not, system may need upgrading.