Usage：
The product is widely used for medical hygiene pharmacy, chemical test, electricity, national defence precision instruments and apparatus.

STRUCTURAL FEATURES：
A. Horizontal single-direction flow
● It’s horizontality flow and open-top, to operate conveniently.
● The towehed switching may regnlate the power. The wind machinery system regulated volume guarantees the working room in ideal state.
B. Vertical single-direction flow
● It’s vertical flow and para-closed top, to prevent the body from stimulation of the strang operation smell, and from the ontside gas.