The Nadair SD-659-32SF is a Super Duty central vacuum power unit with 659 airwatts, 144.9 inches of water lift, and 135.8 CFM of airflow. Its 32 L aluminum canister, hybrid filtration, self-cleaning True HEPA filter, and 65 dB noise level make it a practical choice for homeowners upgrading a whole-house vacuum system.
Authorized Nadair Dealer Ace Vacuums can help you confirm compatibility with your existing piping, choose the right hose and attachment kit, and size the central vacuum system for the home and piping run. The unit includes one triple-layer disposable bag and one True HEPA self-cleaning filter; the hose and cleaning tools are sold separately.
The Nadair SD-659-32SF is a central vacuum power unit designed for an installed whole-house vacuum network. Its 6.6-inch, two-stage Ametek Lamb by-pass motor delivers 659 airwatts, 144.9 inches of water lift, and 135.8 CFM of airflow for cleaning through compatible central vacuum piping.
This model uses a hybrid filtration system, so it can operate with a disposable bag or in bagless mode. The included triple-layer bag helps contain collected debris, while the included True HEPA self-cleaning polypropylene filter remains installed during operation and filters up to 99.99% according to the supplied product information.
The 32 L bottom-load canister provides more capacity than the 22 L version in the same Super Duty family. The polished aluminum canister is described as lightweight, rustproof, and smooth, while dual noise isolation combines noise-isolating foam with an external or integrated muffler for quieter operation.
Soft-start and stop technology is intended to extend motor life by 20%, and the three-second stop delay helps clear the hose and piping after the system is switched off. An LED indicator displays unit status and provides a reminder to empty the canister.
The SD-659-32SF suits homeowners who want a large-capacity central vacuum system with flexible bagged or bagless operation and a self-cleaning True HEPA filter. Its 65 dB rating, bottom-load canister, dual side air intake, and compatibility with standard 2-inch outside-diameter PVC piping make it useful for replacement installations and existing central vacuum networks.
Choose the SD-659-32SF over the SD-659-22SF when the larger 32 L capacity is more useful than the smaller 22 L canister. The smaller model has the same listed motor performance, filtration rating, airflow, water lift, and noise level, but the 22 L unit may be easier to accommodate where installation space is limited.
A sibling model may be a better fit when a different priority comes first. The HD-750-32H provides 750 airwatts, 146 inches of water lift, and 141.2 CFM at the same listed 65 dB noise level, while the SD-750SM-32SF adds app and voice start-stop, three speeds, and live status.
The 32 L / 8.45 gal bottom-load canister provides more debris capacity than the 22 L Super Duty model, which can reduce how often the canister needs attention.
This unit can be used with or without a disposable bag and includes both a triple-layer bag and a True HEPA self-cleaning filter.
The included True HEPA self-cleaning polypropylene filter is designed to filter up to 99.99%, and the filter must remain installed even when the unit is used with a bag.
The motor is listed at 65 dB and uses double noise isolation with noise-isolating foam and an included muffler.
Dual side air intakes and compatibility with standard 2-inch outside-diameter PVC piping can simplify connection to an existing central vacuum piping network.
The two-stage semi-commercial-grade motor provides 659 airwatts, 144.9 inches of water lift, and 135.8 CFM for a central vacuum system with substantial listed suction performance.
The SD-659-32SF combines a high-capacity 32 L canister with flexible hybrid filtration. You can use the included FD-45L-3NAD disposable bag or operate bagless with the included FILP-SF True HEPA self-cleaning filter, while the filter remains installed in either configuration.
Its feature set is oriented toward long-term installed use rather than portable cleaning. The aluminum bottom-load canister, soft-start and stop technology, LED status indicator, dual side air intake, noise isolation, and 15-year residential parts warranty all support a central vacuum power unit intended to stay connected to the home's piping.
Both models are listed with 659 airwatts, 144.9 inches of water lift, 135.8 CFM, 65 dB noise, hybrid cyclonic filtration up to 99.99%, soft-start and stop technology, and the Super Duty self-cleaning filter system. The SD-659-32SF has a 32 L / 8.45 gal canister, while the SD-659-22SF has a 22 L / 5.8 gal canister.
Both units have 32 L / 8.45 gal capacity and a listed 65 dB noise level. The HD-750-32H lists 750 airwatts, 146 inches of water lift, and 141.2 CFM, while the SD-659-32SF lists 659 airwatts, 144.9 inches of water lift, and 135.8 CFM; the SD model lists up to 99.99% filtration and self-cleaning True HEPA filtration.
A central vacuum power unit stays in a garage, basement, or other suitable utility location, so you do not carry the main machine from room to room. The system can also be configured with exhaust venting outdoors, subject to proper installation, while the hose and cleaning tools connect at the home's inlets.
Bagged operation uses the included triple-layer disposable bag and can make collected debris easier to remove. Hybrid operation allows bagless use with the True HEPA self-cleaning filter, but the filter must stay installed and must not be washed.
It is designed to fit existing standard 2-inch outside-diameter PVC piping meeting ASTM F2158. Ace Vacuums can help verify the piping and inlet arrangement before purchase.
Yes. The hybrid system supports bagged or bagless operation, but the True HEPA self-cleaning filter must be installed at all times, including when a bag is used.
No hose or attachment kit is listed as included. The hose and tools are sold separately and must match the home's inlets, including whether the system uses low-voltage or electric hose controls.
The manual advises emptying the canister or replacing the bag two or three times per year. Actual timing depends on use and how much debris the system collects.
Clean or replace the filter whenever the canister is emptied or after every three bags. Do not wash the True HEPA filter, and replace it every year to maintain the warranty.
| Specification | Details |
|---|---|
| Brand | Nadair |
| Model | SD-659-32SF |
| Series | Super Duty Series |
| Motor | 6.6-inch, two-stage Ametek Lamb by-pass, semi-commercial grade motor |
| Airwatts | 659 |
| Water Lift | 144.9 inches |
| Airflow | 135.8 CFM |
| Noise Level | 65 dB |
| Canister Capacity | 32 L / 8.45 gal |
| Canister Material | Aluminum |
| Canister Loading | Bottom load |
| Filtration | Cyclonic self-cleaning hybrid filtration; usable with or without a bag; filters up to 99.99% |
| Replacement Bag | FD-45L-3NAD bag |
| Replacement Filter | FILP-SF True HEPA self-cleaning filter |
| Air Intake | Dual side air intake |
| Electrical | Dedicated individual 15 A branch circuit; 110-120 VAC, 60 Hz |
| Power Cord | 72-inch grounded cord |
| Dimensions | 13.25 inches deep x 37.26 inches high x 17.25 inches wide |
| Included | One triple-layer disposable filtration bag and one True HEPA self-cleaning filter |
| Warranty | 15 years parts on the motor, body, housing, electronic module, and dust bin while owned, plus 1 year of labor; residential use only |
| Piping Compatibility | Standard 2-inch outside-diameter PVC piping meeting ASTM F2158 |
| Authorized Dealer | Ace Vacuums |
Perfect for:
When you purchase from Authorized Nadair Dealer Ace Vacuums, you receive:
The Nadair SD-659-32SF is available online and in-store through Authorized Nadair Dealer Ace Vacuums.
Call 703-997-9292 (ext. 1 Fairfax, ext. 2 Leesburg). Both stores are open 7 days a week to compare central vacuum systems and talk with our specialists.
| Feature | Nadair SD-659-32SF | Nadair HD-750-32H |
|---|---|---|
| Airwatts | 659 | 750 |
| Water lift | 144.9 inches | 146 inches |
| Airflow | 135.8 CFM | 141.2 CFM |
| Noise level | 65 dB | 65 dB |
| Canister capacity | 32 L / 8.45 gal | 32 L / 8.45 gal |
| Filtration | Hybrid cyclonic, with or without bag, up to 99.99% | Hybrid cyclonic, with or without bag, up to 99.97% |
| Soft start and stop | Yes | Yes |
| Series | Super Duty Series | Heavy Duty Series |
The Nadair SD-659-32SF is a Super Duty central vacuum power unit with 659 airwatts, 144.9 inches of water lift, and 135.8 CFM of airflow. Its 32 L aluminum canister, hybrid filtration, self-cleaning True HEPA filter, and 65 dB noise level make it a practical choice for homeowners upgrading a whole-house vacuum system.
Authorized Nadair Dealer Ace Vacuums can help you confirm compatibility with your existing piping, choose the right hose and attachment kit, and size the central vacuum system for the home and piping run. The unit includes one triple-layer disposable bag and one True HEPA self-cleaning filter; the hose and cleaning tools are sold separately.
The Nadair SD-659-32SF is a central vacuum power unit designed for an installed whole-house vacuum network. Its 6.6-inch, two-stage Ametek Lamb by-pass motor delivers 659 airwatts, 144.9 inches of water lift, and 135.8 CFM of airflow for cleaning through compatible central vacuum piping.
This model uses a hybrid filtration system, so it can operate with a disposable bag or in bagless mode. The included triple-layer bag helps contain collected debris, while the included True HEPA self-cleaning polypropylene filter remains installed during operation and filters up to 99.99% according to the supplied product information.
The 32 L bottom-load canister provides more capacity than the 22 L version in the same Super Duty family. The polished aluminum canister is described as lightweight, rustproof, and smooth, while dual noise isolation combines noise-isolating foam with an external or integrated muffler for quieter operation.
Soft-start and stop technology is intended to extend motor life by 20%, and the three-second stop delay helps clear the hose and piping after the system is switched off. An LED indicator displays unit status and provides a reminder to empty the canister.
The SD-659-32SF suits homeowners who want a large-capacity central vacuum system with flexible bagged or bagless operation and a self-cleaning True HEPA filter. Its 65 dB rating, bottom-load canister, dual side air intake, and compatibility with standard 2-inch outside-diameter PVC piping make it useful for replacement installations and existing central vacuum networks.
Choose the SD-659-32SF over the SD-659-22SF when the larger 32 L capacity is more useful than the smaller 22 L canister. The smaller model has the same listed motor performance, filtration rating, airflow, water lift, and noise level, but the 22 L unit may be easier to accommodate where installation space is limited.
A sibling model may be a better fit when a different priority comes first. The HD-750-32H provides 750 airwatts, 146 inches of water lift, and 141.2 CFM at the same listed 65 dB noise level, while the SD-750SM-32SF adds app and voice start-stop, three speeds, and live status.
The 32 L / 8.45 gal bottom-load canister provides more debris capacity than the 22 L Super Duty model, which can reduce how often the canister needs attention.
This unit can be used with or without a disposable bag and includes both a triple-layer bag and a True HEPA self-cleaning filter.
The included True HEPA self-cleaning polypropylene filter is designed to filter up to 99.99%, and the filter must remain installed even when the unit is used with a bag.
The motor is listed at 65 dB and uses double noise isolation with noise-isolating foam and an included muffler.
Dual side air intakes and compatibility with standard 2-inch outside-diameter PVC piping can simplify connection to an existing central vacuum piping network.
The two-stage semi-commercial-grade motor provides 659 airwatts, 144.9 inches of water lift, and 135.8 CFM for a central vacuum system with substantial listed suction performance.
The SD-659-32SF combines a high-capacity 32 L canister with flexible hybrid filtration. You can use the included FD-45L-3NAD disposable bag or operate bagless with the included FILP-SF True HEPA self-cleaning filter, while the filter remains installed in either configuration.
Its feature set is oriented toward long-term installed use rather than portable cleaning. The aluminum bottom-load canister, soft-start and stop technology, LED status indicator, dual side air intake, noise isolation, and 15-year residential parts warranty all support a central vacuum power unit intended to stay connected to the home's piping.
Both models are listed with 659 airwatts, 144.9 inches of water lift, 135.8 CFM, 65 dB noise, hybrid cyclonic filtration up to 99.99%, soft-start and stop technology, and the Super Duty self-cleaning filter system. The SD-659-32SF has a 32 L / 8.45 gal canister, while the SD-659-22SF has a 22 L / 5.8 gal canister.
Both units have 32 L / 8.45 gal capacity and a listed 65 dB noise level. The HD-750-32H lists 750 airwatts, 146 inches of water lift, and 141.2 CFM, while the SD-659-32SF lists 659 airwatts, 144.9 inches of water lift, and 135.8 CFM; the SD model lists up to 99.99% filtration and self-cleaning True HEPA filtration.
A central vacuum power unit stays in a garage, basement, or other suitable utility location, so you do not carry the main machine from room to room. The system can also be configured with exhaust venting outdoors, subject to proper installation, while the hose and cleaning tools connect at the home's inlets.
Bagged operation uses the included triple-layer disposable bag and can make collected debris easier to remove. Hybrid operation allows bagless use with the True HEPA self-cleaning filter, but the filter must stay installed and must not be washed.
It is designed to fit existing standard 2-inch outside-diameter PVC piping meeting ASTM F2158. Ace Vacuums can help verify the piping and inlet arrangement before purchase.
Yes. The hybrid system supports bagged or bagless operation, but the True HEPA self-cleaning filter must be installed at all times, including when a bag is used.
No hose or attachment kit is listed as included. The hose and tools are sold separately and must match the home's inlets, including whether the system uses low-voltage or electric hose controls.
The manual advises emptying the canister or replacing the bag two or three times per year. Actual timing depends on use and how much debris the system collects.
Clean or replace the filter whenever the canister is emptied or after every three bags. Do not wash the True HEPA filter, and replace it every year to maintain the warranty.
| Specification | Details |
|---|---|
| Brand | Nadair |
| Model | SD-659-32SF |
| Series | Super Duty Series |
| Motor | 6.6-inch, two-stage Ametek Lamb by-pass, semi-commercial grade motor |
| Airwatts | 659 |
| Water Lift | 144.9 inches |
| Airflow | 135.8 CFM |
| Noise Level | 65 dB |
| Canister Capacity | 32 L / 8.45 gal |
| Canister Material | Aluminum |
| Canister Loading | Bottom load |
| Filtration | Cyclonic self-cleaning hybrid filtration; usable with or without a bag; filters up to 99.99% |
| Replacement Bag | FD-45L-3NAD bag |
| Replacement Filter | FILP-SF True HEPA self-cleaning filter |
| Air Intake | Dual side air intake |
| Electrical | Dedicated individual 15 A branch circuit; 110-120 VAC, 60 Hz |
| Power Cord | 72-inch grounded cord |
| Dimensions | 13.25 inches deep x 37.26 inches high x 17.25 inches wide |
| Included | One triple-layer disposable filtration bag and one True HEPA self-cleaning filter |
| Warranty | 15 years parts on the motor, body, housing, electronic module, and dust bin while owned, plus 1 year of labor; residential use only |
| Piping Compatibility | Standard 2-inch outside-diameter PVC piping meeting ASTM F2158 |
| Authorized Dealer | Ace Vacuums |
Perfect for:
When you purchase from Authorized Nadair Dealer Ace Vacuums, you receive:
The Nadair SD-659-32SF is available online and in-store through Authorized Nadair Dealer Ace Vacuums.
Call 703-997-9292 (ext. 1 Fairfax, ext. 2 Leesburg). Both stores are open 7 days a week to compare central vacuum systems and talk with our specialists.
| Feature | Nadair SD-659-32SF | Nadair HD-750-32H |
|---|---|---|
| Airwatts | 659 | 750 |
| Water lift | 144.9 inches | 146 inches |
| Airflow | 135.8 CFM | 141.2 CFM |
| Noise level | 65 dB | 65 dB |
| Canister capacity | 32 L / 8.45 gal | 32 L / 8.45 gal |
| Filtration | Hybrid cyclonic, with or without bag, up to 99.99% | Hybrid cyclonic, with or without bag, up to 99.97% |
| Soft start and stop | Yes | Yes |
| Series | Super Duty Series | Heavy Duty Series |
It is a Super Duty central vacuum power unit with a 659-airwatt, two-stage Ametek Lamb by-pass motor. It connects to installed central vacuum piping and uses a 32 L bottom-load canister.
The listed performance is 659 airwatts, 144.9 inches of water lift, and 135.8 CFM of airflow. These figures describe the power unit's stated suction and airflow specifications.
It is a hybrid system. You can use the FD-45L-3NAD disposable bag or operate without a bag using the included True HEPA self-cleaning filter.
Yes. The True HEPA self-cleaning polypropylene filter must be installed at all times, including during bagged operation.
No. The manual specifically says not to wash the True HEPA filter because washing may clog it and void the warranty.
The manual calls for cleaning or replacement whenever the canister is emptied or after every three bags. It also calls for yearly replacement to maintain the warranty.
The 32 L SD-659-32SF uses the FD-45L-3NAD bag. The listed replacement pack contains three bags.
The unit is designed for standard 2-inch outside-diameter PVC piping meeting ASTM F2158. Existing piping and connections should still be checked before installation.
No hose is listed as included. A compatible hose and attachment kit must be purchased separately and matched to the home's low-voltage or electric inlet configuration.
The listed noise level is 65 dB. Noise-isolating foam and a muffler are included as part of the double noise-isolation system.
The Super Duty owner manual requires a dedicated individual 15 A branch circuit at 110-120 VAC and 60 Hz. Do not use an extension cord or adapter.
No. The manual calls for a well-ventilated, weather-protected location and says not to install the unit outdoors. Exhaust venting outdoors is recommended when practical.
The manual specifies 6 inches of clearance all around the unit. The listed dimensions are 13.25 inches deep, 37.26 inches high, and 17.25 inches wide.
The manual advises emptying the canister or replacing the bag two or three times per year. Heavy use may require more frequent attention.
The feature is designed to extend motor life by 20%. The system also has a three-second stop delay intended to help clear the hose and piping.
The warranty provides 15 years of parts coverage on the motor, body, housing, electronic module, and dust bin while you own the unit, plus 1 year of labor. It is for residential use only and requires proof of purchase and an invoice for installation by a qualified electrician.
Yes. Ace Vacuums can help review the home's existing piping, inlet type, hose requirements, and installation conditions. Coverage should be sized for the home and piping run rather than estimated from a general square-foot claim.
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Address: 11110 Main St, Fairfax, VA 22030
Landmark: Opposite Havertys Furniture Store
Best for: Bethesda, Potomac, Arlington, NW Washington D.C.
Address: 300 Fort Evans Rd NE, Suite 104, Leesburg, VA 20176
Landmark: Next to Home Depot in Leesburg
Best for: Ashburn, Sterling, Frederick MD, Loudoun County
In-stock merchandise generally ships from our Leesburg, Virginia location within 3–5 business days. Processing time is separate from carrier transit time and is not a guaranteed delivery date. Weekends and holidays can affect timing. Special-order, backordered or unavailable items may take longer; contact us to confirm timing before purchase when a deadline matters.
Shipping options and charges are shown at checkout. After dispatch, follow the carrier's tracking updates. Weather, carrier delays, order verification and inventory confirmation may affect delivery. Inspect packages promptly and retain packaging if there is damage or an incorrect or missing item.
Eligible unused items have a 30-calendar-day return request window for refunds or exchanges, measured from delivery or in-store purchase. Return authorization is required. Final-sale exclusions, the 15% restocking fee for change-of-mind returns and shipping responsibilities are explained in our Return and Refund Policy. That policy is the governing source for return eligibility and fees.
For shipping or return help, email sales@acevacuums.com or call 703-997-9292.
Updated September 27, 2026. Request a return for an eligible unused item within 30 calendar days of delivery (or purchase for items collected in store). Eligible returns may be refunded to the original payment method or exchanged, subject to availability. The same 30-day request window applies to both refunds and exchanges; there is no separate seven-day or 15-day refund deadline.
Items must be unused, clean, complete and in their original packaging with all accessories, manuals and proof of purchase. Contact sales@acevacuums.com or 703-997-9292 before sending anything back. Include your order number, item and reason for return. We will confirm eligibility, charges and return instructions. Unapproved or cash-on-delivery returns are not accepted.
For an approved change-of-mind return, a 15% restocking fee applies to the returned merchandise price. Original shipping charges are not refundable and the customer pays return shipping. These charges do not apply to an approved return caused by our shipping error or a damaged/defective item claim. Contact us first so we can arrange the appropriate remedy and shipping instructions. Do not assume a prepaid label is included.
Air purifiers; discounted, clearance, trade-in, holiday-sale and price-matched purchases; gift cards; custom or special-order products; electrical parts; used or installed items; opened cleaning solutions; and used bags, filters, belts or other consumables are not eligible for change-of-mind returns. Other items clearly marked final sale at purchase are also excluded. An opened box alone does not disqualify an otherwise eligible unused, complete item, but consumables and cleaning solutions must remain unopened.
Inspect your order promptly and contact us as soon as you discover a problem, with your order number and photos where helpful. Keep the packaging. Change-of-mind exclusions and deadlines do not remove applicable defect, warranty, recall or statutory rights. Warranty coverage requires evaluation under the manufacturer's terms; dealer status does not guarantee free repair. Recalled products must follow the manufacturer's recall process.
After we receive and inspect the return, we will notify you of approval or the reason it cannot be accepted. Approved refunds are issued to the original payment method within 10 business days of approval; your bank may take additional time to post them. Contact us if more than 15 business days have passed since approval. Exchanges require authorization and replacement availability; any price difference and applicable charges will be explained before processing.
This policy applies to online and in-store purchases. We will honor more favorable written return terms provided with an earlier purchase. Applicable consumer rights remain unaffected. Where the European Union 14-day cancellation right applies, customers may cancel or return eligible orders within 14 days of receipt, subject to applicable legal exceptions, without giving a reason.
Build your cleaning setup with useful accessories. Compare the hose connection and kit contents before choosing; complete kits are alternative setups.
Hose fit depends on your wall inlet, handle, wand and electrical connection. Round 1¼-inch tools do not fit every proprietary or D-shaped handle. A low-voltage hose controls suction but cannot power a corded electric brush. Pigtail hoses need a nearby electrical outlet; direct-connect hoses need matching powered inlets. Check what a complete kit already includes.
30-foot pigtail hose and SEBO powerhead kit. Requires a matching inlet and a nearby electrical outlet. Check included tools before adding extras.
30-foot TurboCat air-driven cleaning kit. Match the wall inlet; turbine cleaning needs adequate airflow and uses no power cord.
ValuFlex replacement electric hose. Verify inlet, handle, wand and electrical connection; select the correct length and connection setup.
Low-voltage hose for suction tools. Match the wall inlet and select the length. It cannot power a corded electric brush.
Separate 30-foot hose and tools for cars and garages. Confirm that the utility or wall inlet accepts the hose connection.
Air-driven Rugrat mini tool for stairs and upholstery. Requires a matching hose connector and adequate suction; no electrical connection.
12-inch hard-floor brush for round 1¼-inch wands. Not a direct fit for proprietary D-shaped connectors.
6-inch upholstery tool with brush strip for furniture and stairs. Match the round hose-end connector.
Soft dusting brush for furniture and detail cleaning. Match the round hose or wand connection.
Crevice tool for sofa gaps, corners and baseboards. Check the hose-end diameter and shape.
Telescopic friction-fit wand for suction tools. Accepts a round 1⅛–1¼-inch hose end; no integrated electrical connection.
Padded zippered cover for a conventional hose. Choose the matching length; not for stretch or retractable hoses.
Wall hanger for a conventional 25–35-foot hose wound in four or five loops. Not storage for an in-wall retractable hose.
18-by-18-inch mesh caddy for organizing loose cleaning tools. Tools and wall hanger are sold separately.
Maintenance sheets for routine central vacuum hose and pipe care. Follow the label and system instructions; not a substitute for repair of a blockage or damaged system.
Match the full power-unit model, production version, bag collar and filter dimensions. Cyclonic, disposable-bag and permanent-filter systems use different supplies. A similar size or shared brand name is not enough to confirm fit. If a matching supply is not shown, send us the model label and a photo of the old bag or filter. Shop central vacuum bags & filters
For 25+ years, Ace Vacuums has filled the gap left by big-box retailers. We provide the expert repairs, warranty support, and genuine OEM parts that Amazon and Walmart simply don't offer. From free estimates to same-day service, we are your local alternative for professional home care solutions.
Conveniently serving Washington D.C. and Maryland (Montgomery & Prince George's Counties). Our showrooms are just 20 minutes from DC and 10 minutes from Tysons Corner.
Hablamos Español — Service in English & Spanish.
Serving Zip Codes: 20147, 20176, 22030, 22031, 20151, 20190, 22102, 22314, 20110, 20148 & surrounding areas. All repairs performed by certified technicians using genuine parts.
