What is Fit re-testing requirements in British Colombia?

In British Columbia, the regulatory requirements for respirator fit re-testing, as outlined in the Occupational Health and Safety Regulation, mandate that a fit test must be conducted: (a) before the initial use of a respirator, (b) at least once a year, (c) whenever there is a change in respirator facepiece, including the brand, model, and size, and (d) whenever changes to the user's physical condition could affect the respirator fit. These tests must be performed in accordance with the procedures outlined in CSA Standard CAN/CSA-Z94.4-02, Selection, Use, and Care of Respirators. [2] [2]

Additionally, before each use of a respirator that requires an effective face seal, a worker must perform a positive or negative pressure user seal check, as per CSA Standard CAN/CSA-Z94.4-02, Selection, Use, and Care of Respirators. [1]