Ametek Lamb vacuum motors have been a staple in the vacuum and blower industry for many years. They are preferred because they have proven to be both durable and dependable. Many industries like the central vacuum industry used Lamb branded motors in their lines of products because they can count on their performance. Many different configurations of motors are available including peripheral bypass motors, through flow motors and tangential bypass motors, all with variations from one to three stages. It is important that users ensure that the cooling air does not mix with the vacuum or blower air. Cooling air is typically made available through an egress in the equipment housing.

Bypass motors come in two different configurations, peripheral bypass and tangential bypass. The method chosen depends upon the method of mounting and air ducting geometry because the working air does not travel across the motor at all. This style of motor is a dependable choice for wet pickup applications such as scrubbers and carpet extraction.

Bypass motors are available in single or multiple stages. The stages are used to create more pressure if used as a blower or more life if used as a vacuum. Single stage motors typically have the highest airflow slash air-watts whilst the lowest vacuum levels. Adding fan stages increases the vacuum capability of the unit but does result in reduced airflow. This is because of increased impedance to air flow through the system, the result of additional fans (rotating and stationary) through which the air must pass.