Silent Master Central Vacuum

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!

Maximized Cleaning
Silent Master Central Vacuum 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.

Minimized Risk
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.

	S460r 120 volt	S500r 120 volt	S720r2 240 volt	S560r 120 volt | 240 volt	S900r 120 volt | 240 volt
MD Part #	S1157NH	S1254NH	S2254NH	S1154AH	S1257NH
Former Model	SilentMaster S4	SilentMaster S2			SilentMaster S5
Motor	Single 3-stage 5.7″ by-pass	Dual 2-stage 5.7″ by-pass	Dual 2-stage 5.7″ by-pass	Single 2-stage 5.7″ by-pass	Dual 3-stage 5.7″ by-pass
Max Air Watts	458	495	722	557	905
Max Amps	14.1	16	9.8	16.8	27.8
Waterlift	139″	84″	95″	138.9″	139″
CFM at 2″ opening	101	166	208	125	191
Voltage	120	120	240	120	120
Height	37″	37″	37″	37″	37″
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*
Quietness	62dBA	62dBA	62dBA	62dBA	64dBA
Warranty	12 Year Transferable + Lifetime
Protection	Resettable Minibreaker
Construction	18 & 20 Gauge Steel
Finish	Powder Coat
Dual Exhaust
Dual Intake Valves
Utility Valve Connection

SilentMaster Warranty
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.

Exterior Venting
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.