115. Make-up air heaters: Any make-up air heater used in an establishment and operated with natural or propane gas shall comply with CGA Standard 3.7-1976 of the Canadian Gas Association published in a document entitled Direct Gas-Fired Non-Recirculating Make-up Air Heaters and with the standards of the Installation Code for natural gas burning appliances and equipment and the Installation Code for propane burning appliances and equipment (O.C. 174-80, 80-01-23).