Nadair ST-700-35H Central Vacuum Power Unit, 9.25-Gal Bin

Bin size is what separates the Nadair ST-700-35H from the smaller ST-700-25H, and this is the larger of the two, SKU 70035. 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.

A 35-liter (9.25-gallon) canister gives a larger home or a busier household more time between emptyings. Nadair rates the hybrid cyclonic filtration to capture up to 99.97 percent of particles with or without a bag in place, and the unit comes with one triple-layer disposable bag and one permanent, machine-washable filter, so it can be run either way from the day it goes in.

• Motor: 5.7-inch, two-stage Ametek thru-flow
• Performance: 700 air watts, 141.2 in. water lift, 140.2 CFM
• Capacity: 35 L / 9.25-gallon 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 30.20 in. H x 12.52 in. W
• Warranty: 10 years

It connects to the standard central vacuum inlet and tubing runs already in place, which makes it a straightforward step up for a system that has outgrown a smaller canister.

Where the unit goes matters as much as which size you pick. A 35-liter canister is emptied less often but is more to handle when the time comes, so leave working room around it and mount it at a height you can lift from. A garage, basement or utility room also keeps the 63 dB of running noise out of a finished space.