The Nadair SD-659-22SF is a Super Duty central vacuum power unit with 659 airwatts, 144.9 inches of water lift, and 135.8 CFM of airflow. Its 22 L aluminum canister, hybrid filtration, self-cleaning True HEPA filter, and soft-start/stop motor technology make it a substantial whole-house vacuum option.
Authorized Nadair Dealer Ace Vacuums can help you compare this central vacuum system with your existing piping and choose a compatible hose and attachment kit. The unit is designed for residential installation and includes a 15-year parts warranty on the motor, body, housing, electronic module, and dust bin, plus one year of labor.
The Nadair SD-659-22SF is built around a 6.6-inch, two-stage Ametek Lamb by-pass semi-commercial-grade motor. It produces 659 airwatts, 144.9 inches of water lift, and 135.8 CFM, giving the central vacuum power unit strong suction and airflow for connected cleaning inlets.
This model uses a hybrid filtration design. You can operate it with a disposable triple-layer filtration bag or without a bag, while the True HEPA self-cleaning polypropylene filter remains installed. Nadair states that the filtration system filters up to 99.99 percent.
The 22 L / 5.8 gal aluminum canister loads from the bottom for easier removal wherever the unit is installed. Aluminum is rustproof, lightweight, and smooth, while dual side air intakes make it easier to connect the unit to an existing piping network.
At 65 dB, the SD-659-22SF includes noise-isolating foam and an external muffler for additional sound reduction. Soft-start/stop technology is designed to extend motor life by 20 percent, and a three-second delay helps clear the hose and piping after shutoff.
This model suits homeowners who want a durable central vacuum power unit with hybrid filtration, a 22 L canister, and a residential warranty that covers the motor and main housing components for 15 years. It is also a practical choice when the home already has compatible standard 2-inch outside-diameter PVC central vacuum piping.
The smaller ST-700-25H provides 700 airwatts and higher 140.2 CFM airflow in a 25 L canister, while the HD-750-22H offers 750 airwatts, 146 inches of water lift, and 141.2 CFM at the same 22 L capacity. Those models may be a better fit for shoppers prioritizing higher published performance numbers over the SD-659-22SF's True HEPA self-cleaning filtration claim.
If you want more capacity, the SD-659-32SF keeps the same 659 airwatts, 144.9 inches of water lift, 135.8 CFM, and 65 dB rating while increasing the canister to 32 L. Ace Vacuums can help size the unit for the home and piping run rather than relying on a square-foot coverage estimate.
The unit can run with a disposable bag or in bagless mode, while its True HEPA self-cleaning filter stays installed for both operating options.
Nadair states that the cyclonic self-cleaning filtration system filters up to 99.99 percent, and the included True HEPA filter supports the hybrid design.
Dual side air intakes and compatibility with standard 2-inch outside-diameter PVC central vacuum piping support replacement or new installation work.
The 65 dB noise rating is paired with noise-isolating foam and an external muffler for additional noise reduction.
The 22 L / 5.8 gal bottom-load canister provides substantial collection capacity and is designed for convenient removal.
Soft-start/stop technology is designed to extend motor life by 20 percent, and the residential warranty provides 15 years of parts coverage on listed components.
The SD-659-22SF combines a semi-commercial-grade Ametek Lamb by-pass motor with a hybrid filtration system that can be used bagged or bagless. That flexibility lets homeowners choose the operating method that best fits their routine while keeping the included True HEPA self-cleaning filter in place.
Its design also addresses everyday ownership details. The bottom-load aluminum canister is easy to remove, the LED provides a canister-emptying reminder, soft-start/stop technology is intended to extend motor life, and the included external muffler works with internal noise-isolating foam to reduce operating sound.
Both models have a 22 L canister and a 65 dB rating. The SD-659-22SF provides 659 airwatts, 144.9 inches of water lift, and 135.8 CFM with filtration stated up to 99.99 percent, while the HD-750-22H provides 750 airwatts, 146 inches of water lift, and 141.2 CFM with filtration stated up to 99.97 percent.
These two Super Duty models share 659 airwatts, 144.9 inches of water lift, 135.8 CFM, and a 65 dB rating. The SD-659-22SF has a 22 L / 5.8 gal canister, while the SD-659-32SF increases capacity to 32 L / 8.45 gal.
A central vacuum power unit sits in a garage or basement instead of being carried from room to room. Its exhaust can be vented outdoors, and the user handles the hose and cleaning tools rather than moving a heavy portable machine.
The SD-659-22SF can use a disposable bag or operate without a bag using its cyclonic filtration system. The True HEPA self-cleaning filter must remain installed in either mode and must not be washed.
The unit fits existing standard 2-inch outside-diameter PVC central vacuum piping meeting ASTM F2158. Ace Vacuums can help check the piping run and confirm the rest of the installation requirements.
Yes. This is a hybrid system that can be used with or without a disposable filtration bag. The True HEPA self-cleaning filter must still be installed when operating bagless.
No. The Super Duty True HEPA self-cleaning polypropylene filter must not be washed because washing may clog it and void the warranty. Clean or replace it when the canister is emptied or after every three bags, following the manual's care instructions.
No hose or attachment kit is listed as included. The hose and tools are sold separately and must match the home's low-voltage or electric inlet configuration.
The unit measures 13.25 inches deep by 25.39 inches high by 17.25 inches wide. The manual calls for a well-ventilated, weather-protected location with 6 inches of clearance on all sides.
| Specification | Details |
|---|---|
| Brand | Nadair |
| Model | SD-659-22SF |
| Series | Super Duty Series |
| Motor | 6.6-inch, two-stage Ametek Lamb by-pass, semi-commercial grade |
| Airwatts | 659 |
| Water Lift | 144.9 inches |
| Airflow | 135.8 CFM |
| Noise Level | 65 dB |
| Canister Capacity | 22 L / 5.8 gal |
| Canister Material | Aluminum; rustproof, lightweight, smooth, and shiny |
| Canister Loading | Bottom load |
| Filtration | Cyclonic self-cleaning hybrid filtration; usable with or without a bag; filters up to 99.99 percent; True HEPA filter must remain installed |
| Replacement Bag | FD-22.5L-3NAD bags, sold in packs of 3 |
| 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; no extension cords or adapters |
| Dimensions | 13.25 inches deep x 25.39 inches high x 17.25 inches wide |
| Included | One triple-layer disposable filtration bag and one True HEPA self-cleaning filter |
| Warranty | 15 years of parts coverage on the motor, body, housing, electronic module, and dust bin while you own it, plus one 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-659-22SF 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-659-22SF | Nadair HD-750-22H |
|---|---|---|
| Series | Super Duty Series | Heavy Duty Series |
| 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 | 22 L / 5.8 gal | 22 L / 5.81 gal |
| Filtration | Hybrid cyclonic, with or without bag, up to 99.99 percent | Hybrid cyclonic, with or without bag, up to 99.97 percent |
| Motor control | Soft-start/stop | Soft-start/stop |
The Nadair SD-659-22SF is a Super Duty central vacuum power unit with 659 airwatts, 144.9 inches of water lift, and 135.8 CFM of airflow. Its 22 L aluminum canister, hybrid filtration, self-cleaning True HEPA filter, and soft-start/stop motor technology make it a substantial whole-house vacuum option.
Authorized Nadair Dealer Ace Vacuums can help you compare this central vacuum system with your existing piping and choose a compatible hose and attachment kit. The unit is designed for residential installation and includes a 15-year parts warranty on the motor, body, housing, electronic module, and dust bin, plus one year of labor.
The Nadair SD-659-22SF is built around a 6.6-inch, two-stage Ametek Lamb by-pass semi-commercial-grade motor. It produces 659 airwatts, 144.9 inches of water lift, and 135.8 CFM, giving the central vacuum power unit strong suction and airflow for connected cleaning inlets.
This model uses a hybrid filtration design. You can operate it with a disposable triple-layer filtration bag or without a bag, while the True HEPA self-cleaning polypropylene filter remains installed. Nadair states that the filtration system filters up to 99.99 percent.
The 22 L / 5.8 gal aluminum canister loads from the bottom for easier removal wherever the unit is installed. Aluminum is rustproof, lightweight, and smooth, while dual side air intakes make it easier to connect the unit to an existing piping network.
At 65 dB, the SD-659-22SF includes noise-isolating foam and an external muffler for additional sound reduction. Soft-start/stop technology is designed to extend motor life by 20 percent, and a three-second delay helps clear the hose and piping after shutoff.
This model suits homeowners who want a durable central vacuum power unit with hybrid filtration, a 22 L canister, and a residential warranty that covers the motor and main housing components for 15 years. It is also a practical choice when the home already has compatible standard 2-inch outside-diameter PVC central vacuum piping.
The smaller ST-700-25H provides 700 airwatts and higher 140.2 CFM airflow in a 25 L canister, while the HD-750-22H offers 750 airwatts, 146 inches of water lift, and 141.2 CFM at the same 22 L capacity. Those models may be a better fit for shoppers prioritizing higher published performance numbers over the SD-659-22SF's True HEPA self-cleaning filtration claim.
If you want more capacity, the SD-659-32SF keeps the same 659 airwatts, 144.9 inches of water lift, 135.8 CFM, and 65 dB rating while increasing the canister to 32 L. Ace Vacuums can help size the unit for the home and piping run rather than relying on a square-foot coverage estimate.
The unit can run with a disposable bag or in bagless mode, while its True HEPA self-cleaning filter stays installed for both operating options.
Nadair states that the cyclonic self-cleaning filtration system filters up to 99.99 percent, and the included True HEPA filter supports the hybrid design.
Dual side air intakes and compatibility with standard 2-inch outside-diameter PVC central vacuum piping support replacement or new installation work.
The 65 dB noise rating is paired with noise-isolating foam and an external muffler for additional noise reduction.
The 22 L / 5.8 gal bottom-load canister provides substantial collection capacity and is designed for convenient removal.
Soft-start/stop technology is designed to extend motor life by 20 percent, and the residential warranty provides 15 years of parts coverage on listed components.
The SD-659-22SF combines a semi-commercial-grade Ametek Lamb by-pass motor with a hybrid filtration system that can be used bagged or bagless. That flexibility lets homeowners choose the operating method that best fits their routine while keeping the included True HEPA self-cleaning filter in place.
Its design also addresses everyday ownership details. The bottom-load aluminum canister is easy to remove, the LED provides a canister-emptying reminder, soft-start/stop technology is intended to extend motor life, and the included external muffler works with internal noise-isolating foam to reduce operating sound.
Both models have a 22 L canister and a 65 dB rating. The SD-659-22SF provides 659 airwatts, 144.9 inches of water lift, and 135.8 CFM with filtration stated up to 99.99 percent, while the HD-750-22H provides 750 airwatts, 146 inches of water lift, and 141.2 CFM with filtration stated up to 99.97 percent.
These two Super Duty models share 659 airwatts, 144.9 inches of water lift, 135.8 CFM, and a 65 dB rating. The SD-659-22SF has a 22 L / 5.8 gal canister, while the SD-659-32SF increases capacity to 32 L / 8.45 gal.
A central vacuum power unit sits in a garage or basement instead of being carried from room to room. Its exhaust can be vented outdoors, and the user handles the hose and cleaning tools rather than moving a heavy portable machine.
The SD-659-22SF can use a disposable bag or operate without a bag using its cyclonic filtration system. The True HEPA self-cleaning filter must remain installed in either mode and must not be washed.
The unit fits existing standard 2-inch outside-diameter PVC central vacuum piping meeting ASTM F2158. Ace Vacuums can help check the piping run and confirm the rest of the installation requirements.
Yes. This is a hybrid system that can be used with or without a disposable filtration bag. The True HEPA self-cleaning filter must still be installed when operating bagless.
No. The Super Duty True HEPA self-cleaning polypropylene filter must not be washed because washing may clog it and void the warranty. Clean or replace it when the canister is emptied or after every three bags, following the manual's care instructions.
No hose or attachment kit is listed as included. The hose and tools are sold separately and must match the home's low-voltage or electric inlet configuration.
The unit measures 13.25 inches deep by 25.39 inches high by 17.25 inches wide. The manual calls for a well-ventilated, weather-protected location with 6 inches of clearance on all sides.
| Specification | Details |
|---|---|
| Brand | Nadair |
| Model | SD-659-22SF |
| Series | Super Duty Series |
| Motor | 6.6-inch, two-stage Ametek Lamb by-pass, semi-commercial grade |
| Airwatts | 659 |
| Water Lift | 144.9 inches |
| Airflow | 135.8 CFM |
| Noise Level | 65 dB |
| Canister Capacity | 22 L / 5.8 gal |
| Canister Material | Aluminum; rustproof, lightweight, smooth, and shiny |
| Canister Loading | Bottom load |
| Filtration | Cyclonic self-cleaning hybrid filtration; usable with or without a bag; filters up to 99.99 percent; True HEPA filter must remain installed |
| Replacement Bag | FD-22.5L-3NAD bags, sold in packs of 3 |
| 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; no extension cords or adapters |
| Dimensions | 13.25 inches deep x 25.39 inches high x 17.25 inches wide |
| Included | One triple-layer disposable filtration bag and one True HEPA self-cleaning filter |
| Warranty | 15 years of parts coverage on the motor, body, housing, electronic module, and dust bin while you own it, plus one 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-659-22SF 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-659-22SF | Nadair HD-750-22H |
|---|---|---|
| Series | Super Duty Series | Heavy Duty Series |
| 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 | 22 L / 5.8 gal | 22 L / 5.81 gal |
| Filtration | Hybrid cyclonic, with or without bag, up to 99.99 percent | Hybrid cyclonic, with or without bag, up to 99.97 percent |
| Motor control | Soft-start/stop | Soft-start/stop |
It is a Super Duty Series central vacuum power unit with a 659-airwatt, two-stage Ametek Lamb by-pass motor. It has a 22 L aluminum canister and hybrid bagged or bagless filtration.
Nadair rates it at 659 airwatts, 144.9 inches of water lift, and 135.8 CFM of airflow.
The rated noise level is 65 dB. Noise-isolating foam and an included external muffler are part of the unit's noise-reduction design.
It uses a cyclonic self-cleaning hybrid filtration system and includes one True HEPA self-cleaning polypropylene filter. The system can be used with or without a disposable bag, but the HEPA filter must remain installed.
No. The manual specifically says not to wash the True HEPA filter because washing may clog it and void the warranty.
Clean or replace the filter each time the canister is emptied or after every three bag changes. Replace the True HEPA filter annually to keep the warranty in effect.
The 22 L SD-659-22SF uses FD-22.5L-3NAD bags. The provided manual information identifies these bags as packs of three.
Nadair's manual recommends emptying the canister or replacing the bag two or three times per year. Actual timing depends on how much the system is used.
No hose is listed as included. The hose and attachment kit are sold separately and must match the home's inlet system.
Yes. The unit is listed as compatible with standard 2-inch outside-diameter PVC piping meeting ASTM F2158. The existing piping and low-voltage connections should be checked before installation.
The manual requires a dedicated individual 15 A branch circuit at 110-120 VAC and 60 Hz. Do not use an extension cord or adapter, and have the electrical work completed by a qualified electrician.
No. The manual calls for a well-ventilated, weather-protected location and says the unit should not be installed outdoors. Outdoor exhaust venting is recommended where practical.
The manual calls for 6 inches of clearance around all sides. The listed dimensions are 13.25 inches deep by 25.39 inches high by 17.25 inches wide.
It starts and stops the motor gradually. Nadair states that this technology extends motor life by 20 percent, and the unit also has a three-second delay to help clear the hose and piping.
The LED indicator displays the status of the power unit and provides a reminder to empty the canister.
For residential use, the warranty provides 15 years of parts coverage on the motor, body, housing, electronic module, and dust bin while you own the unit, plus one year of labor. Proof of purchase and an invoice for installation by a qualified electrician are required.
No. It is a hybrid central vacuum system that can operate with a disposable bag or without one. The True HEPA self-cleaning filter must be installed in both modes.
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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
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Best for: Ashburn, Sterling, Frederick MD, Loudoun County
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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.
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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.
