{"product_id":"nadair-sd-659-22sf-super-duty-hepa-central-vacuum-power-unit-659-aw-22l","title":"Nadair SD-659-22SF Super Duty HEPA Central Vacuum Power Unit, 659 AW, 22L","description":"\u003ch2\u003eQuick Summary\u003c\/h2\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eAuthorized 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.\u003c\/p\u003e\n\u003ch3\u003eQuick Highlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e659 airwatts with 144.9 inches of water lift and 135.8 CFM airflow\u003c\/li\u003e\n\u003cli\u003e65 dB operating noise with noise-isolating foam and an included external muffler\u003c\/li\u003e\n\u003cli\u003e22 L \/ 5.8 gal bottom-load aluminum canister\u003c\/li\u003e\n\u003cli\u003eHybrid operation with a disposable bag or bagless cyclonic filtration\u003c\/li\u003e\n\u003cli\u003e15-year parts warranty plus one year of labor for residential use\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Overview\u003c\/h2\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eThis 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.\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eAt 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.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eExpert Recommendation\u003c\/h2\u003e\n\u003cp\u003eThis 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.\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eIf 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.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eBest For\u003c\/h2\u003e\n\u003ch3\u003eHybrid Filtration\u003c\/h3\u003e\n\u003cp\u003eThe unit can run with a disposable bag or in bagless mode, while its True HEPA self-cleaning filter stays installed for both operating options.\u003c\/p\u003e\n\u003ch3\u003eAllergy-Conscious Households\u003c\/h3\u003e\n\u003cp\u003eNadair states that the cyclonic self-cleaning filtration system filters up to 99.99 percent, and the included True HEPA filter supports the hybrid design.\u003c\/p\u003e\n\u003ch3\u003eExisting Piping Networks\u003c\/h3\u003e\n\u003cp\u003eDual side air intakes and compatibility with standard 2-inch outside-diameter PVC central vacuum piping support replacement or new installation work.\u003c\/p\u003e\n\u003ch3\u003eNoise-Aware Homes\u003c\/h3\u003e\n\u003cp\u003eThe 65 dB noise rating is paired with noise-isolating foam and an external muffler for additional noise reduction.\u003c\/p\u003e\n\u003ch3\u003eFrequent Whole-House Cleaning\u003c\/h3\u003e\n\u003cp\u003eThe 22 L \/ 5.8 gal bottom-load canister provides substantial collection capacity and is designed for convenient removal.\u003c\/p\u003e\n\u003ch3\u003eLong-Term Residential Use\u003c\/h3\u003e\n\u003cp\u003eSoft-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.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eNot Ideal For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eIt is not ideal for shoppers who want a complete cleaning package because the hose and attachment kit are sold separately.\u003c\/li\u003e\n\u003cli\u003eThe unit requires a dedicated individual 15 A branch circuit and qualified electrical installation, so it is not a plug-in replacement for a portable vacuum.\u003c\/li\u003e\n\u003cli\u003eHomeowners who prefer the highest published airflow or suction numbers may prefer the HD-750-22H or another higher-output Nadair model.\u003c\/li\u003e\n\u003cli\u003eThe 22 L canister requires installation space and may not be the right choice if a larger 32 L canister would better suit the cleaning schedule.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e659 Airwatts:\u003c\/strong\u003e The two-stage motor system is rated at 659 airwatts for central vacuum cleaning.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrong Suction:\u003c\/strong\u003e Published performance is 144.9 inches of water lift and 135.8 CFM.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHybrid Filtration:\u003c\/strong\u003e Use the system with a disposable bag or without a bag using the cyclonic filtration design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue HEPA Filter:\u003c\/strong\u003e One True HEPA self-cleaning polypropylene filter is included and must remain installed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e22 L Canister:\u003c\/strong\u003e The 22 L \/ 5.8 gal aluminum canister uses a convenient bottom-load design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoft Start\/Stop:\u003c\/strong\u003e The motor starts and stops gradually, with Nadair stating that this extends motor life by 20 percent.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNoise Isolation:\u003c\/strong\u003e Noise-isolating foam and an external muffler support the 65 dB silent-system design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLED Indicator:\u003c\/strong\u003e The LED indicator displays unit status and reminds you to empty the canister.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Air Intakes:\u003c\/strong\u003e Dual side air intakes simplify connection to an existing piping network.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eWhat Makes This Model Stand Out\u003c\/h2\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eIts 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.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Comparisons\u003c\/h2\u003e\n\u003ch3\u003eSD-659-22SF vs HD-750-22H\u003c\/h3\u003e\n\u003cp\u003eBoth 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.\u003c\/p\u003e\n\u003ch3\u003eSD-659-22SF vs SD-659-32SF\u003c\/h3\u003e\n\u003cp\u003eThese 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.\u003c\/p\u003e\n\u003ch3\u003eCentral Vacuum vs Portable Vacuum\u003c\/h3\u003e\n\u003cp\u003eA 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.\u003c\/p\u003e\n\u003ch3\u003eBagged vs Hybrid Operation\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eQuestions Buyers Commonly Ask\u003c\/h2\u003e\n\u003ch3\u003eCan this central vacuum use my existing piping?\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003ch3\u003eCan I use it without a disposable bag?\u003c\/h3\u003e\n\u003cp\u003eYes. 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.\u003c\/p\u003e\n\u003ch3\u003eIs the filter washable?\u003c\/h3\u003e\n\u003cp\u003eNo. 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.\u003c\/p\u003e\n\u003ch3\u003eDoes the system include a hose and tools?\u003c\/h3\u003e\n\u003cp\u003eNo 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.\u003c\/p\u003e\n\u003ch3\u003eHow much installation space does it need?\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eNadair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSD-659-22SF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eSuper Duty Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor\u003c\/td\u003e\n\u003ctd\u003e6.6-inch, two-stage Ametek Lamb by-pass, semi-commercial grade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAirwatts\u003c\/td\u003e\n\u003ctd\u003e659\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Lift\u003c\/td\u003e\n\u003ctd\u003e144.9 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAirflow\u003c\/td\u003e\n\u003ctd\u003e135.8 CFM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNoise Level\u003c\/td\u003e\n\u003ctd\u003e65 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCanister Capacity\u003c\/td\u003e\n\u003ctd\u003e22 L \/ 5.8 gal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCanister Material\u003c\/td\u003e\n\u003ctd\u003eAluminum; rustproof, lightweight, smooth, and shiny\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCanister Loading\u003c\/td\u003e\n\u003ctd\u003eBottom load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFiltration\u003c\/td\u003e\n\u003ctd\u003eCyclonic self-cleaning hybrid filtration; usable with or without a bag; filters up to 99.99 percent; True HEPA filter must remain installed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReplacement Bag\u003c\/td\u003e\n\u003ctd\u003eFD-22.5L-3NAD bags, sold in packs of 3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReplacement Filter\u003c\/td\u003e\n\u003ctd\u003eFILP-SF True HEPA self-cleaning filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAir Intake\u003c\/td\u003e\n\u003ctd\u003eDual side air intake\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical\u003c\/td\u003e\n\u003ctd\u003eDedicated individual 15 A branch circuit; 110-120 VAC, 60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Cord\u003c\/td\u003e\n\u003ctd\u003e72-inch grounded cord; no extension cords or adapters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e13.25 inches deep x 25.39 inches high x 17.25 inches wide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded\u003c\/td\u003e\n\u003ctd\u003eOne triple-layer disposable filtration bag and one True HEPA self-cleaning filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e15 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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePiping Compatibility\u003c\/td\u003e\n\u003ctd\u003eStandard 2-inch outside-diameter PVC piping meeting ASTM F2158\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAuthorized Dealer\u003c\/td\u003e\n\u003ctd\u003eAce Vacuums\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eInstall the unit indoors in a well-ventilated, weather-protected location; do not install it outdoors.\u003c\/li\u003e\n\u003cli\u003eMaintain 6 inches of clearance around all sides of the power unit.\u003c\/li\u003e\n\u003cli\u003eConnect it to a dedicated individual 15 A branch circuit at 110-120 VAC and 60 Hz. Do not use an extension cord or adapter.\u003c\/li\u003e\n\u003cli\u003eUse the 72-inch grounded power cord and have electrical work handled by a qualified electrician. The warranty requires proof of purchase and an installation invoice from a qualified electrician.\u003c\/li\u003e\n\u003cli\u003eExhaust venting outdoors is recommended where the installation allows it.\u003c\/li\u003e\n\u003cli\u003eThe unit fits standard 2-inch outside-diameter PVC piping. Low-voltage wire is needed when using a hose with an on-off switch.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eMaintenance Tips\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eEmpty the canister or replace the disposable bag two or three times per year, with actual frequency depending on use.\u003c\/li\u003e\n\u003cli\u003eUse FD-22.5L-3NAD bags for the 22 L canister when operating in bagged mode.\u003c\/li\u003e\n\u003cli\u003eClean or replace the True HEPA filter whenever the canister is emptied or after every three bag changes. Do not wash the filter.\u003c\/li\u003e\n\u003cli\u003eReplace the True HEPA filter every year to maintain the warranty requirements.\u003c\/li\u003e\n\u003cli\u003eKeep the True HEPA self-cleaning filter installed at all times, including during bagged operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eIdeal Buyers\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePerfect for:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHomeowners replacing an existing central vacuum power unit with compatible standard 2-inch PVC piping\u003c\/li\u003e\n\u003cli\u003eHouseholds wanting the choice of disposable-bag or bagless operation\u003c\/li\u003e\n\u003cli\u003eBuyers who value a True HEPA self-cleaning filter and a stated filtration rate of up to 99.99 percent\u003c\/li\u003e\n\u003cli\u003eResidential users who want a 22 L aluminum bottom-load canister\u003c\/li\u003e\n\u003cli\u003eHomeowners prepared for dedicated-circuit electrical installation and separate hose and tool selection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy Buy from Ace Vacuums\u003c\/h2\u003e\n\u003cp\u003eWhen you purchase from \u003cstrong\u003eAuthorized Nadair Dealer Ace Vacuums\u003c\/strong\u003e, you receive:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Nadair central vacuum power units\u003c\/li\u003e\n\u003cli\u003eExpert help sizing the right unit for your home and piping\u003c\/li\u003e\n\u003cli\u003eGuidance on matching hoses and attachment kits to your inlets\u003c\/li\u003e\n\u003cli\u003eGenuine Nadair replacement bags and filters\u003c\/li\u003e\n\u003cli\u003eKnowledgeable customer support before and after the sale\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eAvailable Online \u0026amp; In-Store\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eNadair SD-659-22SF\u003c\/strong\u003e is available online and in-store through \u003cstrong\u003eAuthorized Nadair Dealer Ace Vacuums\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eVisit Our Showrooms\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFairfax, VA:\u003c\/strong\u003e 11110 Main St, Fairfax, VA 22030\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeesburg, VA:\u003c\/strong\u003e 300 Fort Evans Rd NE, Leesburg, VA 20176\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCall 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.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eComparison Table\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eNadair SD-659-22SF\u003c\/th\u003e\n\u003cth\u003eNadair HD-750-22H\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eSuper Duty Series\u003c\/td\u003e\n\u003ctd\u003eHeavy Duty Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAirwatts\u003c\/td\u003e\n\u003ctd\u003e659\u003c\/td\u003e\n\u003ctd\u003e750\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater lift\u003c\/td\u003e\n\u003ctd\u003e144.9 inches\u003c\/td\u003e\n\u003ctd\u003e146 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAirflow\u003c\/td\u003e\n\u003ctd\u003e135.8 CFM\u003c\/td\u003e\n\u003ctd\u003e141.2 CFM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNoise level\u003c\/td\u003e\n\u003ctd\u003e65 dB\u003c\/td\u003e\n\u003ctd\u003e65 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCanister capacity\u003c\/td\u003e\n\u003ctd\u003e22 L \/ 5.8 gal\u003c\/td\u003e\n\u003ctd\u003e22 L \/ 5.81 gal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFiltration\u003c\/td\u003e\n\u003ctd\u003eHybrid cyclonic, with or without bag, up to 99.99 percent\u003c\/td\u003e\n\u003ctd\u003eHybrid cyclonic, with or without bag, up to 99.97 percent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor control\u003c\/td\u003e\n\u003ctd\u003eSoft-start\/stop\u003c\/td\u003e\n\u003ctd\u003eSoft-start\/stop\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003ePros and Cons\u003c\/h2\u003e\n\u003ch3\u003ePros\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e659 airwatts with 144.9 inches of water lift and 135.8 CFM airflow\u003c\/li\u003e\n\u003cli\u003eHybrid bagged or bagless operation adds filtration flexibility\u003c\/li\u003e\n\u003cli\u003eIncluded True HEPA self-cleaning filter with filtration stated up to 99.99 percent\u003c\/li\u003e\n\u003cli\u003e22 L aluminum bottom-load canister with dual side air intakes\u003c\/li\u003e\n\u003cli\u003eSoft-start\/stop technology and three-second hose-and-piping clearing delay\u003c\/li\u003e\n\u003cli\u003e15-year residential parts warranty on listed major components, plus one year of labor\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCons\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHose and attachment kit are sold separately\u003c\/li\u003e\n\u003cli\u003eRequires a dedicated individual 15 A branch circuit and professional electrical installation\u003c\/li\u003e\n\u003cli\u003eThe True HEPA filter must not be washed and requires annual replacement for warranty maintenance\u003c\/li\u003e\n\u003cli\u003eA 22 L canister may provide less capacity than the 32 L Super Duty models\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat is the Nadair SD-659-22SF?\u003c\/h3\u003e\n\u003cp\u003eIt 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.\u003c\/p\u003e\n\u003ch3\u003eHow powerful is this central vacuum system?\u003c\/h3\u003e\n\u003cp\u003eNadair rates it at 659 airwatts, 144.9 inches of water lift, and 135.8 CFM of airflow.\u003c\/p\u003e\n\u003ch3\u003eHow loud is the SD-659-22SF?\u003c\/h3\u003e\n\u003cp\u003eThe rated noise level is 65 dB. Noise-isolating foam and an included external muffler are part of the unit's noise-reduction design.\u003c\/p\u003e\n\u003ch3\u003eWhat type of filter does it use?\u003c\/h3\u003e\n\u003cp\u003eIt 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.\u003c\/p\u003e\n\u003ch3\u003eCan the True HEPA filter be washed?\u003c\/h3\u003e\n\u003cp\u003eNo. The manual specifically says not to wash the True HEPA filter because washing may clog it and void the warranty.\u003c\/p\u003e\n\u003ch3\u003eWhen should I replace the filter?\u003c\/h3\u003e\n\u003cp\u003eClean 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.\u003c\/p\u003e\n\u003ch3\u003eWhich bags fit this model?\u003c\/h3\u003e\n\u003cp\u003eThe 22 L SD-659-22SF uses FD-22.5L-3NAD bags. The provided manual information identifies these bags as packs of three.\u003c\/p\u003e\n\u003ch3\u003eHow often should the canister be emptied?\u003c\/h3\u003e\n\u003cp\u003eNadair'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.\u003c\/p\u003e\n\u003ch3\u003eDoes it include a hose?\u003c\/h3\u003e\n\u003cp\u003eNo hose is listed as included. The hose and attachment kit are sold separately and must match the home's inlet system.\u003c\/p\u003e\n\u003ch3\u003eWill it connect to standard central vacuum piping?\u003c\/h3\u003e\n\u003cp\u003eYes. 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.\u003c\/p\u003e\n\u003ch3\u003eWhat electrical connection does it need?\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003ch3\u003eCan it be installed outside?\u003c\/h3\u003e\n\u003cp\u003eNo. 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.\u003c\/p\u003e\n\u003ch3\u003eHow much clearance is required?\u003c\/h3\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003ch3\u003eWhat does the soft-start\/stop feature do?\u003c\/h3\u003e\n\u003cp\u003eIt 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.\u003c\/p\u003e\n\u003ch3\u003eWhat does the LED indicator show?\u003c\/h3\u003e\n\u003cp\u003eThe LED indicator displays the status of the power unit and provides a reminder to empty the canister.\u003c\/p\u003e\n\u003ch3\u003eWhat does the warranty cover?\u003c\/h3\u003e\n\u003cp\u003eFor 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.\u003c\/p\u003e\n\u003ch3\u003eIs this a bag-only central vacuum?\u003c\/h3\u003e\n\u003cp\u003eNo. 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.\u003c\/p\u003e\n","brand":"Nadair","offers":[{"title":"Default Title","offer_id":53384859975861,"sku":"SD-659-22SF","price":829.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/6751\/0709\/files\/SD-659-32SF-scaled.jpg?v=1790447762","url":"https:\/\/acevacuums.com\/products\/nadair-sd-659-22sf-super-duty-hepa-central-vacuum-power-unit-659-aw-22l","provider":"Ace Vacuums","version":"1.0","type":"link"}