DISADVANTAGES
◦ Energy consuming.
◦ High head space.
◦ Avoid coarse materials into the chamber.
◦ The fed device may be clogged with the clump materials.
◦ Special feeding devices should be provided for the feeding of the materials.
◦ One of the problems encountered with the use of compressed air is the generation of static electricity.
◦ Material recovered in the collection bags is difficult or impossible to remove by the normal blow back procedures.