Use an air flow detector tube (EA770X-0) and a chip cutter (EA770X-10).
Specifications
Dim. Air flow detection pipe: Dia. 42 x 63(L)mm, Smoke generation pipe: Dia. 7.5 x 110(L)mm, Tip cutter: Dia. 32 x 98(H)mm
This device does not use a heat generator. It uses a smoke generation pipe that reacts with the humid in the air to generate white smoke so that the user will know the air flow direction and speed.