From the vacuum brush all the way to the motor, we think we've designed the best and most cost-effective central vacuum system on the market. Our technology ensures us the best designs in regard to:

• Electric Vacuum Power Brushes
• Airflow Dynamics
• Motor Configuration
• Air Filtration

Electric Vacuum Power Brush
The part of the central vacuum system you will spend the most time with is the power brush, while you're cleaning the carpet. The best brush for today's home is an electric brush. An electric brush opens up space between the carpet fibers, maximizes airflow rushing past those open fibers, and has a bristle action removing any particles or threads clinging to them. The industry has recognized that the Stealth brush from M.D. Manufacturing is the best brush on the market and an important reason we think our system is better than the rest.

Airflow Dynamics
It's not enough to just have the best brush. To achieve maximum performance out of the electric power brush, you must maximize the airflow dynamics of the system. That means the connection of the brush to the wall inlet must be designed at an optimal diameter for maximum suction power. A four-inlet system with approximately 80 feet of 2" pipe to the motor and a 30-foot x 1 3/8" hose on the carpet will produce its effective performance at the 1 1/8" air opening size in the power brush. While most manufacturers ignore this law o f airflow and only offer units with high water-lift statistics, M.D. has specifically designed its S2, B2, M32, S5 and G23 to peak their performance at the 1 1/8" opening size for maximum airflow.

Motor Configuration
The next step in ensuring maximum benefit from your central system is using the proper motor. Maximum airflow dynamics is achieved with two motors operating in parallel, not in series, and cannot be achieved with a single motor. Due to the expense of the motors, most two motor units are made from 5.7" motors as opposed to the larger 7.2" motors. Single motor systems peak their performance at a 3/4" to 7/8" opening and have lost almost half their power at the larger 1 1/8" opening. That's why we design our entire system to take advantage of maximum performance specifications in every component.

Also, due to our motors being on the bottom of the power unit, we have the coolest running motors. Power units with the motor located on the top pull in cooling air from the highest, hottest point of the unit. Our cooling intake on the bottom provides the lowest, coolest air. All of this adds up to greater longevity of the power unit.

TOP MOUNTED MOTOR, INVERTED CLOTH FILTER Recommended outside-venting. Looses power as dust permanently builds up in filter. Filter requires shaking in order to clean it, depositing dust on floor beneath.

TOP MOUNTED MOTOR, FILTERLESS Requires outside venting. Deposits debris on outside walls, plants, etc. Screen requires monthly cleaning. 5 to 7% of dust & lint enters fan chambers, reducing motor life.

BOTTOM MOUNTED MOTOR, FILTERED Exhausts clean air. No outside-venting necessary. Extended motor life. Disposable dust-free filterbag.

Air Filtration
M.D. has designed the most extensive filtration system to protect the motors. An inherent limitation in competitors cyclonic systems exists in that the motors should not have ANY dust going into the impellers! Our paper filters are the largest in the industry, have the highest air-permeability rating, and the lowest initial pressure loss. As a side benefit of this filtration, our units do not need to be vented outside in most applications.

Added Extras
Add to all these benefits the fact that our SilentMaster® units . . .

To back up our claims, we provide a 6-year warranty on all electrical components. Don't be fooled by "Lifetime Warranties." Read the fine print (if findable). Make sure it covers wear and tear!

Our technical support is "par excellance." No other company offers you the technical education on each and every facet of the industry. The MD website alone, at over 400 pages, addresses more issues than any other vacuum company in the world. Also, because of our exclusive distribution policies, we have retained the best installers of central vacuums in more than 40 countries.

Now that you are armed with the important facts, we hope you will agree that M.D. central vacuum products will clean your home better than any other vacuum out there. We welcome any comparison!