CFM vs. Waterlift

CFM is defined as the Cubic Feet of Air per Minute that is moved through a specific size opening. In the vacuum industry, this is usually expressed at a standard size of two inches. Waterlift, on the other hand, is the vertical distance that same power source (a vacuum motor) is able to lift a column of water up a sealed tube (the water creates the seal), through the power of suction.

As the size of the opening (orifice) gets smaller, the waterlift increases and CFM decreases. Conversely, as the opening gets larger, the waterlift decreases while the CFM increases. Depending on the power unit these differences can be quite substantial.

Therefore, it becomes imperative to know how the performance of each individual power unit is effected by any one orifice within a particular system.

Read Vacuumology 2, and see the helpful charts.

AirWatts vs. Orifice

AirWatts or "Cleanability Rating" is defined as CFM at a given opening (orifice) multiplied by the waterlift at that same opening, then divided by 8.5.

The most critical measurements are those representing the smallest size opening through which air is flowing in any particular system. Therefore, being able to calculate the AirWatts of each individual unit and knowing the actual orifice of each specific tool, makes it possible to select the power brush best suited for the needs of that system. In essence, you are able to create the optimum package for your individual requirements.
Read Air Driven vs. Electric.

SilentMaster WARRANTY

SilentMaster warranties all its power units against electrical component failure for a period of three (3) years. Any parts or repairs (excluding filters) required within the first three years will be furnished free of charge by the authorized dealer from whom the power unit was originally purchased.

SilentMaster will; extend the warranty on all its power units for an additional three (3) years --- for an overall coverage of six (6) years --- provided the motor brushes are inspected and replaced (if needed) at the end of the first three (3) years. There is a nominal service charge for the warranty extension and the inspection must be done by an authorized SilentMaster dealer.

SilentMaster also provides a Lifetime Warranty for those units serviced on the extended warranty plan by continuing to replace and/or repair all "replacement" parts at a cost never to exceed fifty percent (50%) of the retail price at the time the repair or replacement takes place. The Lifetime Warranty begins at the end of the warranty extension period and is in effect for the life of the unit. Additionally, all SilentMaster units are guaranteed for life against defects in materials and workmanship. In the event an authorized dealer is not nearby, SilentMaster will honor and perform all warranty and/or warranty extension services for a nominal charge, provided the power unit is returned to the factory, freight prepaid, and it can be verified that all services were performed by an authorized SilentMaster dealer. This warranty does not apply to commercial applications, misuse, abuse, or if unit has been worked on by an unauthorized person.