Have a look at the following link regarding manufacture and servicing of commercial extraction systems.
Certification is presented to you after the service has been completed. Before/After digital photographs are supplied on completion of every service, as well as a written report for your extraction system.
All service work is compliant with SANS1850:2012, and the tailor-made certificate will state that, keeping health inspectors and insurance companies happy.
Safety Regulations – Click to download