The Ametek Lamb 116325-00 is a single-stage, 5.7-inch peripheral bypass motor on 120 volts, and it is bought by people who need volume of air rather than deep lift. Single-stage bypass motors move a lot of air at modest sealed vacuum, which suits large-diameter hose, short duct runs, blower duty and wet recovery work where the machine designer traded lift for airflow on purpose. Published output is roughly 95 CFM with 50.1 inches of sealed vacuum in a one-speed, open-enclosure package.
Built for these use cases
- Single-stage replacement in commercial canister vacuums and OEM machines
- Wet recovery equipment where a bypass motor is required
- Blower and air-mover duty needing airflow more than sealed lift
- Short-hose or large-bore applications where high vacuum is not the goal
- Repair benches stocking 120-volt single-stage spares
A bypass motor carries a separate cooling fan, so the air that cools the armature and field never mixes with the air being pulled through the machine. That separation is the whole reason bypass motors are specified for wet recovery work such as carpet extraction and autoscrubber recovery, where the airstream is carrying water, foam and cleaning solution. It also means the motor is not being cooled by whatever the operator happens to be picking up.
Peripheral discharge exhausts cooling air around the full circumference of the motor housing rather than through a single port. In a canister or power unit that has room around the motor, peripheral discharge keeps exhaust noise diffuse and simplifies the mounting, which is why it shows up so often in central vacuum power units.
One stage means one fan. Compared with the two- and three-stage motors in the same 5.7-inch family, a single-stage motor gives up sealed lift and gains airflow per amp drawn. If your machine is struggling to pull through a long, narrow hose, a single-stage motor is not the fix; if it needs to move a lot of air through a short, wide path, it is exactly right.
A note on published amperage: several listings for 116325-00 show a maximum amp figure identical to the 5.7-inch frame dimension, which looks like a data-entry artifact rather than a measurement. We are not repeating an amp rating here. Read the current draw off the motor nameplate, or call us and we will check the Ametek data for the exact suffix you are holding.
Specifications
- Manufacturer part number: 116325-00
- Frame diameter: 5.7 inches
- Blower stages: 1
- Cooling: Bypass
- Discharge: Peripheral
- Voltage: 120 V, 60/50 Hz, single phase
- Speeds: 1
- Airflow: 95 CFM at a 2-inch orifice
- Sealed vacuum: 50.1 inches of water
- Enclosure: Open
Frequently asked questions
What is the difference between one stage and two stages?
Stages are fans. A single-stage motor like this one moves more air at lower sealed vacuum. A two-stage motor in the same 5.7-inch frame produces noticeably more lift and draws more current. Pick by whether your machine needs airflow or suction.
Can this motor be used on wet pickup?
Yes. This is a bypass motor, so its cooling air is separate from the air being recovered. That is the configuration specified for extractors, scrubber recovery and other wet applications.
What does peripheral discharge mean?
Cooling air exhausts around the circumference of the motor housing rather than through one side port. It is common in central vacuum power units and canisters that have open space around the motor.
Will this replace a two-stage motor in my machine?
Not without a performance change. It will often fit the same mounting, but you will lose sealed lift. Match stage count to what came out unless you are deliberately re-specifying the machine.
How often do the carbon brushes need changing?
Plan on inspecting them around the 300 to 500 hour mark. Ametek's guidance is that brushes can be changed twice before the armature needs attention.
Discount Cleaning Products is an authorized dealer for Ametek Lamb vacuum motors and stocks the matching carbon brush kits, gaskets and mounting hardware alongside them. Our US-based team works with these motors every day across central vacuum systems, extractors, autoscrubbers and shop equipment, and can help you confirm frame size, stage count, discharge style and voltage against the motor already in your machine before you order.
