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• • <br /> 6 . Check both inhalation valves ( inside the cartridge holders) . <br /> Look for same signs as above. <br /> 7. Make sure the cartridge holders are clean. Make sure the <br /> gaskets are in place and the threads are not worn. Also look for <br /> cracks and other damage. <br /> 8. Check the cartridges for dents or other damages , especially <br /> in the threaded part . <br /> 8 . 1 . 2 Donning Procedures <br /> 1. Screw the cartridge into the holder hand tight so there is a <br /> good seal with the gasket in the bottom of the holder , but don' t <br /> force it . If the cartridge won ' t go in easily, back it out and <br /> try again. <br /> Always use cartridges made by the same manufacturer who made the <br /> respirator. <br /> 2 . Fold the straps back over the window piece. <br /> 3 . Hold the facepiece with one hand and the strap piece ( in <br /> front of the window) with the other . <br /> 4. Put your chin in first . Lift the strap piece out and over <br /> your head. <br /> 5. To tighten the straps, use both hands, one on each side and <br /> pull straight back--not out . Tighten side bottom straps first , <br /> then top side straps and finally top strap. <br /> Test the fit : <br /> • Lightly cover the exhalation valve with the palm of your <br /> hand. Exhale. . . if there is a leak, you will feel the air <br /> on your face. <br /> • Cover the cartridge with the palms of your hands . Again, <br /> don ' t press too hard. Inhale. . . the facepiece should col- <br /> lapse against your face. <br /> . If there is a leak with either test , adjust the headbands <br /> or reposition the facepiece and test until no leakage is <br /> detected. <br /> 8 . 1 . 3 Sanitizing Procedures <br /> 1 . Remove all cartridges plus seals not affixed to their seats . <br /> 2 . Remove elastic headbands. <br />