- (a) Test 5 will be conducted to determine the maximum length of time the apparatus will supply the respiratory needs of the wearer while he is sitting at rest.
- (b) The wearer will manipulate the devices controlling the supply of breathing gas to the advantage of the apparatus.
- (c) Samples of inspiration from within the apparatus facepiece or mouthpiece shall be taken once every 15 minutes, and shall meet the minimum requirement for oxygen specified in § 84.79(a), and the maximum allowable average concentration of carbon dioxide specified in § 84.97(c).
- (d) One sample of inspiration will be taken in the case of 3-, 5-, and 10-minute apparatus.