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| S460r 120 volt |
S500r 120 volt |
S720r2 240 volt |
S560r 120 volt | 240 volt |
S900r 120 volt | 240 volt |
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| MD Part # | S1157NH | S1254NH | S2254NH | S1154AH | S1257NH | |||||
| Former Model | SilentMaster S4 | SilentMaster S2 | SilentMaster S5 | |||||||
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| 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 |
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| 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 | Tru-Seal® Closed Bag System | Tru-Seal® Closed Bag System | Tru-Seal® Closed Bag System | Tru-Seal® Closed Bag System | 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 | 12 Year Transferable + Lifetime | 12 Year Transferable + Lifetime | 12 Year Transferable + Lifetime | 12 Year Transferable + Lifetime | 12 Year Transferable + Lifetime | ||||
| Protection | Resettable Minibreaker | Resettable Minibreaker | Resettable Minibreaker | Resettable Minibreaker | Resettable Minibreaker | Resettable Minibreaker | ||||
| Construction | 18 & 20 Gauge Steel | 18 & 20 Gauge Steel | 18 & 20 Gauge Steel | 18 & 20 Gauge Steel | 18 & 20 Gauge Steel | 18 & 20 Gauge Steel | ||||
| Finish | Powder Coat | Powder Coat | Powder Coat | Powder Coat | Powder Coat | Powder Coat | ||||
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| Purchasing Options | Contact Dealer | Contact Dealer | Contact Dealer | Contact Dealer | Contact Dealer | |||||
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.
