1. Open a small round hole above each working point. At ordinary times, the smoke hood closed by baffle connects the branch pipe with the seat and is fixed at the side or below the air duct.

2. When the following technicians need to smoke, fix the base lock of the whole set of solder smoke hood with air volume adjustment switch on the desktop and hang it upside down at any fixed point.

3. Arrange the transparent, smooth and flat horn cover in the most suitable position and direction according to the floating direction of smoke during welding, about 10 cm away from the welding opening, and accept the smoke to be discharged to the main exhaust pipe or outdoor through an exhaust fan.