... .3.It can prevent from cutting off wee dust,absorbing industrial waste gas,such as benzene,formaldehyde and other pernicious gases.4 ... .3.It can prevent from cutting off wee dust,absorbing industrial waste gas,such as benzene,formaldehyde and other pernicious gases.4 ... .3.It can prevent from cutting off wee dust,absorbing industrial waste gas,such as benzene,formaldehyde and other pernicious gases.4 ...