Silent Master’s patented noise suppression system has set the standard for quiet power unit operation. Optional dual-motor units boast high levels of suction and airflow simultaneously which sustains powerful cleaning throughout the system. Each motor has its own cooling fan insuring extra longevity backed by the industry’s longest, 12-year warranty!
Silent-Master Filtration Discerning buyers demand the most powerful, longest lasting, deep-cleaning products available. Silent Master models provide from 495 to 900 air watts of power to deep clean any home. Plus, Silent Master’s Tru-Seal® Microfiltration features a closed bag, 5-ply microfilter that connects to both intakes and the utility valve while holding an industry-high 8 gallons of debris.
Any Home, Any Job Add up all the value: strong vacuum, quiet operation, extra-large capacity, excellent filtration, quality North-American Ametek motors, and all-steel construction. No wonder Silent Master’s performance is backed by a 12-year transferable warranty that even covers “normal wear and tear.” Silent Master is MD’s premiere power unit line.
120 volt | 240 volt
120 volt | 240 volt
|MD Part #||S1157NH||S1254NH||S2254NH||S1154AH||S1257NH|
|Former Model||SilentMaster S4||SilentMaster S2||SilentMaster S5|
|Max Air Watts||458||495||722||557||905|
|CFM at 2″ opening||101||166||208||125||191|
|Weight||39 lbs||43 lbs||43 lbs||42 lbs||49 lbs|
|Trash Capacity||8 gallons||8 gallons||8 gallons||8 gallons||8 gallons|
|Microfiltration||Tru-Seal® Closed Bag System|
|Suggested Max Footage||6,000*||6,000*||8,000*||8,000*||20,000*|
|Warranty||12 Year Transferable + Lifetime|
|Construction||18 & 20 Gauge Steel|
|Dual Intake Valves|
|Utility Valve Connection|
M.D. Manufacturing, Inc. warrants its Silent Master power units against electrical component failure for a period of twelve (12) years. This warranty is transferable with the unit and is not solely limited to the original owner. Any parts (excluding filters) required within the first twelve years will be furnished free of charge by the Authorized Dealer from whom the power unit was originally purchased. In addition, all Silent Master units are guaranteed for life against defects in materials and workmanship.
If an Authorized Dealer is not nearby, M.D. Manufacturing, Inc. will honor and perform required warranty services. The end user must return the unit to the factory freight pre-paid. This warranty does not apply to applications outside of North America, commercial applications, misuse, abuse, acts of God, operating without the filters, or units tampered with by unauthorized personnel.
Venting not required but optional. When venting, vent both exhaust ports.
* A central vacuum’s square foot coverage should be based on factors including altitude, hours of use, complexity of pipe installation, length of furthest vacuum inlet, noise level desired, type and size of filtration, installation materials, and budget. The square footage recommendation on this page can be higher or lower when taking these factors into consideration.