Rotating brush agitates soil residues and dust molecules and before they start spreading, the vacuum cleaner has made its job. Power operated, these kinds have electric motors to run, either single or dual. WET/DRY VACUUM CLEANERS: These are special kinds designed to seep even spills of liquid. It has good exhaust system to reverse the flow of air for purposes of unclogging the tubes after significant use. This is because many appliance firms have been operating for more than 50 years while this one only introduced a vacuum cleaner in 1983. People will notice that vacuum cleaners regardless of size have a filter bag in the unit that has to be replaced when it is full. James Dyson invented a model that did not need this, which manufacturers in Europe were not in favor of so this person promoted it elsewhere until a Japanese firm liked the idea and the company took off. It is also called canister vacuum. Without seeing the physical appearance of a bagless vacuum cleaner, it will make you think: if the vacuum cleaner has no bag, where do the dusts go? There is no mystery with bagless vacuum cleaners. There is a chamber that collects dusts in the body of the bagless vacuum cleaner and special filters to sieve dirt in the end part of the cylinder. Like any other electrical unit, it needs to be protected against dust; or otherwise, the same cover-protection turns to appear as decorative accent to the entire ambiance of a place. Also, if you are tired of maintaining a place for your vacuum cleaner, hiding it somewhere so as not to block traffic passages, much more if your residence is not large enough to allow many things inside, you have a second thought of converting it to a better and more artistic area, with the good idea to think of covering your vacuum cleaner instead of setting it aside. A fan or a pump reduces the pressure, then creating a vacuum environment on the inside. This causes the outside air to rush into the empty space created inside. There are two types, the vertical type or the upright type, which is lightweight and the canister type or the cylinder type. The upright vacuums can be moved over the surfaces that will be cleaned. Vacuum systems could vary in use but it could cover from one of (1) cartridge, (2) Cyclone (bag or centrifugal separators), (3) electricity, (4) air power or gasoline. Points to Consider when Using the Industrial Vacuum Cleaner: 1. Vacuum pressure - Refers to the stable flow in water lift, supposed to be static in nature.