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S4 Power Unit

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Silent Master—Silence is Golden!

Great for homes under 5,000 ft² /550m²
Unique 4 stage filtration (combining cloth, mesh and paper elements) for increased motor life, 12 gallon disposable bags, Unequalled quiet operation due to a patented noise control system.

• The largest dirt capacity available.
• A utility inlet for vacuuming directly from the power unit.
• Four-stage filtration for increased motor life.
• The finest, electrical components: Basler transformers, Honeywell relays, and Lamb motors.
• Electronically spot-welded, 20 gauge steel construction.
• Unequalled, quiet operation.

Four Stage Filtration

1. Air intake. The system of tubing goes from the wall inlet to this point.
2. 12-gallon double-bag tapered dirt receptacle only needs to be emptied around twice a year.
3. M.D. Manufacturing's primary filtering consists of an inner porous 2-ply disposable bag. The first layer is slick so the dirt falls to the bottom. The second is where the fine particle filtering takes place. This is supported by a porous heavy-duty cloth bag (blue). Notice the taper of the bags, which allows maximum surface area for maximized airflow.
4. The air in this open area around the bag and near the motors is tremendously cleaner than cyclonic models, thus protecting the fan blades from build up which causes early failure.
5. The secondary filtering (5 stages of filtration in total) is made of breathable foam and plastic fabric.
6. High performance motors in motor compartment are kept clean by the filtration system above it.
7. Exhaust. While cyclonic models normally need to be vented outside, this filtration system keeps the exhaust much cleaner without any need for venting outside.

30 Harmer St
Gravesend
Kent
UK
DA12 2AX

01474 352264