1. A four-section telescopic tube, gas-collecting hood, mount, and other components.
2.Lab fume exhaust arm size: ① diameters: ф 75mm; ②the total length (in four sections): 1500mm.
3. Lab fume exhaust arm material: ① tube: PP pipe; ② rotary joint: ③ connecting rod Joint Center: galvanized steel ; ④ support spring: plating zinc steel ⑤ joint gasket: low friction ring rubber gasket; ⑥ articular tension knob: PP; sadly, solar Butterfly;Valves: plastic (outer edge by the soft treatment).
4. Gas-collecting hood of ф 310mm.
5. Exhaust hood ventilation volume is adjustable, you can shut down when not.