Development History:
1st Generation: Outdoor one for multiple in-line type.
---> Advantages: Solve the soot problem in workshop
---> Disadvantages: Serious environmental pollution
2nd Generation: Smoke Absorber since 2000.
---> Advantages: Easy to move, easy to operate
---> Disadvantages: No purification effect
3nd Generation: Smoke Absorber pen since 2005.
---> Advantages: simple purification function, easy to move
---> Disadvantages: small capacity, not easy to replace and maintain
4th Generation: Indoor one for multiple purification 2012.
---> Advantages: easy maintenance
---> Disadvantages: highly energy-wasting, not easy to move
5th Generation: PWM control purification since 2013
---> Advantages: Low Energy consumption, easy to move
---> Disadvantages: No alarm function for filter
6th Generation: Remote-control purification since 2015
---> Advantages: alarm function for filter
---> Disadvantages: filter replacement cumbersome, poor smoking effect
7th Generation: Constant airflow & quick-opening type
---> Advantages: Constant airflow technology & The quick-opening & cabinet design filter structure.
---> Disadvantages: Not found yet.