Determining gas flow direction in smoke
This is a supplementary part for smoke tester set No. 500.
A single tube can be repeatedly used for about 50 tests.
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Break off both ends of the smoke tube and attach a rubber squeeze bulb to one end of the tube. When the bulb is squeezed, a chemical reaction produces white smoke. This smoke makes the air flow (in ventilation systems/ducts, etc.) visible.
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