The Dräger Flow Check consists of one device for the smoke production and an ampoule containing smoke-generating fluid (an alcohol mixture that is harmless to the environment). A small heating element in the head of the instrument heats the fluid, which condenses on contact with the ambient air.

The Dräger Flow Check incorporates ergonomic form, low weight, and optimal operation into the instrument design. The instrument will generate clouds in any orientation. Small, single clouds can be generated with a short press of a button. If a continous production of clouds is desired, the button can be held or locked in the “on” position. The fluid ampoule is located in a compartment in the handle of the instrument and can be inserted effortlessly into position. The amount of fluid contained in the ampoule is enough to generate a continuous cloud for a period of approximately three minutes.

Power is supplied by a battery located inside the handle of the instrument and can be charged while inside the instrument or separately.

For the optimal setting of air conditioning systems, air flows have to be located accurately and precisely. With the Flow Check air flow indicator even slightest air movements are made visible to the eye so that their origin, course and speed can be easily detected in order to ensure the functionality of ventilation systems and chimneys. The device produces a cloud of smoke, that floats freely and easily, because it has the same density as ambient air.