100% non-flammable, but with increased global warming potential, use this product for removing dust only on energized circuits, near open flames, or possible ignition sources. Suitable for professional and industrial applications. The 402A Super Duster134TM is a pure, non-flammable duster that can be used on live electronic and electrical equipment. The duster contains pure 1, 1, 1, 2-tetrafluoroethane (HFC 134a), which delivers a constant, high-pressure cleaning jet. The gas jet is dry, low-residue, and chemically inert, which makes it safe for cleaning electrical and electronic components. The 402A duster is ideal for removing lint, dust, and other debris from printed circuit boards, electronic devices, and computers. It helps prevent malfunctions and lengthens component life. To remove safety tab 1. Firmly hold the head of the nozzle and trigger in place. 2. Pull tab forward on top of nozzle until it snaps off. To clean surfaces 3. Spray directly on dusty component using bursts of spray. Clean contamination from top to bottom to avoid redeposit of dust on clean areas. 4. Use extension tube to direct the spray in hard to reach corners. TIP! Avoid continuous spray that causes component to reach freezing temperatures. In contact with moist air, cooled components could lead to unwanted frost formation. Avoid touching the component directly with your hands, nozzle, or extension straw.