Nadair ST-700-25H Central Vacuum Power Unit, 6.6-Gal Bin

The Nadair ST-700-25H is a hybrid central vacuum power unit, SKU 70025, that runs with or without a disposable bag. Nadair publishes it at 700 air watts, 141.2 inches of water lift and 140.2 CFM of airflow, from a 5.7-inch (14.5 cm) two-stage Ametek thru-flow motor.

Debris collects in a 25-liter (6.6-gallon) rolled-steel canister that loads from the bottom. Nadair rates the hybrid cyclonic filtration to capture up to 99.97 percent of particles with or without the bag in place, and the unit comes with one triple-layer disposable bag and one permanent, machine-washable filter.

• Motor: 5.7-inch, two-stage Ametek thru-flow
• Performance: 700 air watts, 141.2 in. water lift, 140.2 CFM
• Capacity: 25 L / 6.6-gallon bottom-load canister
• Filtration: Hybrid cyclonic, bag or bagless, up to 99.97 percent
• Noise: 63 dB with double noise isolation
• Dimensions: 12.91 in. D x 25.39 in. H x 12.52 in. W
• Warranty: 10 years

The unit carries an LED status indicator, and it connects to the standard central vacuum inlet and tubing runs already in place in the home.

Power units in this class are usually installed in a garage, basement, or utility closet rather than a living space. Even with the double noise isolation behind the 63 dB rating, a running power unit is louder up close than most homeowners want inside a finished room, and a utility space keeps the emptying job away from living areas as well.