Ontario's trade code for the Refrigeration and Air Conditioning Systems Mechanic.
313A is the Ontario trade code for the Refrigeration and Air Conditioning Systems Mechanic. Skilled Trades Ontario sets the apprenticeship at 9,000 hours (8,280 on the job and 720 in school). It is a compulsory trade with a certifying exam, and it is a Red Seal trade under the title Refrigeration and Air Conditioning Mechanic. See how the 313A exam is weighted.
Source: Skilled Trades Ontario: Refrigeration and Air Conditioning Systems Mechanic