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Vacuum Configurations
Vacuum cleaners are devices that use an air pump to
create a partial vacuum to suck up dirt and dust,
normally from carpeted floors. Most homes that have
carpet floors have a vacuum for cleaning. The dirt
that is pulled up from the carpet is collected by
a filtering system or even a cyclone for later
disposal.
There are several type of configurations possible
for vacuum cleaners.
Upright
Upright vacuums have the pump mounted directly above
the suction intake, with the bag mounted directly on
the handle, which will rise to waist height or so.
The upright type designs normally employ mechanical
beaters which often rotate brushes, to help disturb
dust enough to be vacuumed up. These beaters are
normally driven by a belt that is attached to the
vacuum motor.
Canister
Also known as cylinder vacuums,[link widoczny dla zalogowanych], the canister type
designs have the motor and bag in a seperate canister
unit that connects to the vacuum head by a flexible
hose. Even though upright units have been tested
as being more effective, the lighter and more
maneuverable heads of the canister models are quite
popular. Some models have power heads, which contain
the same type of mechanical beaters found it upright
units, although they are driven by a seperate electric
motor.
Wet vacs/dry vacs
These types a specialized form of the canister
vacuum and they can be used to clean up wet or liquid
spills as well. They will commonly accomodate both
wet and dry soilage, with some being equipped with
a switch or exhaust port that reverses the flow of
air. This is a very useful function for everything
from clearing clogged hoses to blowing dust into a
corner for easy collecting.
Back pack vac
These types of vacuums are commonly used for
commercial cleaning,[link widoczny dla zalogowanych], as they allow you to move about
quickly and efficiently in a large area. They are
basically canister vacuum cleaners, except for the
fact that straps are used to carry the canister
on your back.
Built in or central
These types of vacuum cleaners will move the suction
motor and bag to a central location in the building
and provide vacuum inlets at strategic places
throughout the entire building. You only need to
carry the hose and pickup head from room to room,
while the hose is normally 25 foot long and allows
a large range of movement without changing vacuum
inlets.
The plastic piping will connect vacuum inlets to
the central unit. The vacuum can either be unpowered
or have beaters that are operated by an electric
motor or an air driven motor. The bag in the
central vacuum system is normally so big that
emptying it or changing needs to be done less as
often,[link widoczny dla zalogowanych], sometimes only once a year.
PPPPP
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The exclusionThe head teacher wrote to the parents of R and F telling them that neither R nor F could come back to school, but that they would be given help in completing their course at home. He should, of course, have told the parents immediately, ideally by telephone followed by a letter, of their right to make representations to the governing body.


[link widoczny dla zalogowanych]