Standard Canister Design & Benefits

A canister type of vacuum cleaner houses the suction motor and filtering system in a somewhat square or rectangular container. Variations of this type are the tank type vacuum cleaner which has a long tubular main body and the central vacuum which is mounted on a basement or garage wall. Typically incorporating a "clean-air" system, they are known for producing strong suction for use with the attachments. When a power nozzle is part of the system it is often referred to as a power team. A canister type vacuum cleaner usually contains wheels which allow it to be pulled after the user by its hose.

	Suction Produced by the Standard Canister

The suction motor design in a canister type creates significantly more actual suction (pressure difference) than the traditional upright motor design. This is important for effective cleaning with a hose and attachments due to the higher resistance to air flow present in the hose. The velocity of the air flow plus the amount of the carpet agitation determines how well a vacuum cleaner will pick up the dirt. To effectively clean carpeted floors, a power nozzle containing a motor driven revolving brush should be used to obtain adequate agitation of the carpet fibers. For more about suction motor and fan designs, see our articles on Suction Motor Design & Operation and Fan or Impeller Types & Performance.

	Performance with Attachments

While an upright specializes in cleaning carpets, a canister type vacuum cleaner specializes in cleaning with its attachments. On-board attachments on uprights are handy to clean a corner or your upholstered furniture but are somewhat limited in what they can do efficiently. A canister type usually has a longer hose, additional attachments for cleaning floors and more suction when using the attachments. They are easily pulled around by their hose, something uprights usually won't do without tipping over. Many canister types carry their attachments conveniently with them for fast switching from one to another. Power teams easily compete with uprights when it comes to effectively cleaning carpeted floors and are generally more versatile with the attachments.

	Air Flow and Filtration Aspects

The air enters the nozzle near the floor and travels through the wands and hose toward the paper filter bag, carrying the dirt with it. The bag retains most of the dirt and dust while allowing the air to pass through its filter media. The air then travels through a filter pad to be cleaned further before entering the high speed suction fan or fans. Since the air is quite clean, it is allowed to flow through the motor to cool it. After leaving the motor the air is often filtered by additional exhaust filters to remove even more fine particles and carbon from the motor brushes before it leaves the vacuum cleaner. Since the "clean-air" suction motor design creates more suction (pressure difference) than a traditional upright design, more filtering can be done without significantly effecting the air flow. "Clean-air" uprights and canisters can easily have filtration efficiencies which meet the HEPA specification when equipped with appropriate filters.

	Examples of Effective Canisters and Power Teams

Traditionally, the more powerful canister suction motors contained two fan stages pulling in series although recently motors like the Miele Vortex Motor have been developed which create similarly strong suction with one specially shaped fan. Most "department store variety" canisters have traditional motors with only one fan while most imported from Europe or sold via in-home (door-to-door) demonstrations have more powerful two-fan motors. A two-fan motor typically will create about one-third more suction than a one-fan motor having the same peak horse power or amperage rating.

The Miele S5 and Miele S4 Galaxy series models produce high suction and air flow amounts with only one fan. Two-fan canisters made in Europe by Lindhaus have similar suction to the Miele vacuums. Two-fan canisters made in the U.S.A. and sold via in-home demonstrations include Majestic by Health-Mor, Inc., Aerus Tank by Aerus LCC (formerly Electrolux), TriStar by TriStar Enterprises, L.L.C., and the Rainbow by Rexair, Inc.

Canister type vacuum cleaners are often teamed with good traditional uprights to produce excellent cleaning combinations. Even the more compact models like the Sanitaire S3681B Compact Canister are very popular when teamed with a good upright. These provide plenty of power for cleaning non-carpeted areas with their attachments.

	Summary

A canister type vacuum cleaner is very versatile, providing superior suction for use with the attachments. When it includes a motorized power nozzle or when teamed with a good upright it will clean all surfaces effectively. These combinations provide an excellent alternative to using an upright with on-board attachments. Also, extremely high filtration efficiencies can be obtained with HEPA filtration systems.

PageType: Educational

Serving South Central Pennsylvania Since 1957 and the USA with a Website Since 1996.
Copyright © 1996 - 2008 Ristenbatt Vacuum Cleaner Service, Inc. - All rights reserved.
Stores at 1724 Lincoln Highway E., Lancaster, PA and 1038 Lancaster Road, Manheim, PA
Voice: 800-413-2778 or 717-665-5126 | Send E-mail | Referrer: Unknown