Dust Director model DD3900, 240 Volt 3-Motor, 447 CFM Vacuum.

Dust Director DD3900 240 Volt 24 Gallon Dust Extractor

Product No. / SKU: DD3900


Identical vacuum as the DD2400 but with 240 volt motors: 3900 Watts, 342 CFM, 97″ H20, 24 Gallon HD Poly Tank.


  • Assembly line operations requiring continuous duty, long hours of operation
  • Dry Use

Product Details

A compact power house — Identical to the 120 volt DD2400 model but with 240 volt motors for even greater CFM Performance Each motor has its own on/off switch — Only use two motors and still be impressed. You can attach the “Y” Hose Splitter and operate two (2) handheld angle grinders.

A compact, durable and very portable and maneuverable 24 gallon collection tank ~ A+ for walking through doorways. When larger size grinders are being used this vacuum can be used with the optional Pre-Separators or Power Stations (see below). The 30″ Floor Sweep converts the DD2400 into the best “sweeper” on the market for vacuuming dry powders and dry and wet debris. See below for additional information on the 30″ Floor Sweep.

Filter System – AIRFlow HEPA Filtration ~ Expect to collect over 110 lbs. of concrete dust and notice a “maximum” drop in suction of 15% WITHOUT turning off the vacuum. Turn off the vacuum and the filter bag releases any caking by deflating itself. Turn on the vacuum and the filter bag inflates to return 100% suction power as you collect an additional 40+ lbs. of dry powder. The 24 gallon collection tank will fill completely, to its inlet port, with maybe a minimal drop in suction power.

Filter System includes: HEPA Cartridge Filter, Clean Extreme Filter Collection Bags (3). Any type of debris, from dry concrete powder to moist or oily debris to hot mastics — everything is collected and contained within the Clean Extreme Filter Bag WITH minimal suction loss AND with everything completely contained within the Clean Extreme Filter Bag.


  • Clean Extreme Filter Bag completely fills – to the inlet port on the tank ~ Providing long operating times without suction drop
  • The outside of the filter bag stays clean
  • The inside of the tank stays clean
  • The HEPA Cartridge Filter stays clean (expect to replace it in two or three years)
  • Removal, handling & disposal of the completely contained debris is clean, easy and without a mess.

Equipped as follows: 24 gal. HD Polythene Collection Tank, 240 Volt Turbine 2-Stage 1300 Watt Motors x 3, 5.8 Amps x 3, 342 CFM, 97″ H20, 2″ Inlet Port, 2″ x 12′ Hose, 2″ ID Smooth Vinyl Hose Cuff, AIRFlow HEPA Filtration, (3) Clean Extreme Filter Bags. Silica Dust Capacity: 150 lbs. Increases to 190 lbs. when a Power Station is used. Size: 19.5″ x 17″ x 38″, 50 lbs., Sound Level: 78.0dB


The DD3900 is identical to the 3-Motor 120 volt DD2400 model. But it is not limited to the amp draw of a 120 volt circuit. Equipped with 2-stage motors, the 240 volt DD3900 is 60% to 70% more powerful than the 1-stage motors of the DD2400.

Producing over 3900 watts of suction power, the DD3900 will handle roughly 90% of all Concrete Grinding Dust Extraction Applications and that percentage is growing as more and more applications are being fulfilled by this very Powerful, Compact, Versatile and Easy to Handle and Maneuver Vacuum.

Fast Growing Application for the DD3900. Industrial and manufacturing facilities where traditional continuous-duty 3-phase vacuums are mainly used.

How Powerful is the DD3900? On some applications you may only need one (1) motor! This will be especially true during concrete polishing when the heavy grinding of using the coarser diamond grits is done and you switch to the finer grits. At that time, you can only use 1 or 2-motors and you’ll find that by reducing suction (or lowering the CFM) the incoming debris will fall naturally inside the collection tank before it can reach the vacuum’s filters – thus further helping or helping to prevent premature filter blinding.

And when all three motors are being used, you’ll also be able to achieve that “white glove” test so that all of the fine dust is completely removed before moving onto the finer grits.

Extremely Durable, Portable and Compact. The 24 Gallon Tank, while providing large collection yields, is very mobile easy and compact. Its handles, wheels and casters are all built into the tank to provide A+ protection from breakage and for transporting through residential door ways.

The strong, molded polyethylene tank provides incredible versatility and durability: Highly recommended for abusive situations and applications, including its ability to withstand breakage such as when a fork lift rams into it or when falling out of the truck when going down the highway.

Collection & Productivity Advantage: Powerful 2 and 3-Motor suction plus its large tank (but still compact and portable) easily doubles operation or productivity times.

AIRFlow HEPA Filter System – Expect to extract large volumes of the finest of powders without suction drop or contamination of neither the inside of the tank or your work area.

Additionally, the Dust Director’s unique HEPA rated cartridge filter permits simultaneous dry and wet recovery without the hassle of changing filters during a clean-up project. The filter is easily removed from its filter cage for washing and re-use.

Easy Storage, Transportation & Handling – Equipped with durable metal tank-clamps that won’t crack, snap or wear from heavy use ~ even when the tank is completely full and being handled with its collection capacity of 140 lbs. of silica (without incurring suction drop.)

  • Compliance
  • OSHA's Silica Dust Exposure Law

    Effective Date:? 23 June 2016, Compliance Date:? 23 June 2017.

    Are You In Compliance?

    The Dust Director? has been used and has figured prominently in just about every silica dust control study since its inception in 2001.

    Bosch grinder grinding brick mortar joints - without using the Dust Director.
    Grinding brick mortar joints without using the Dust Director?.
    Grinding brick mortar joints using the Dust Director.
    Grinding brick mortar joints using the Dust Director?.
    Dust Director, Bosch grinder and a Manometer.
    The Dust Director? attached to a Bosch angle grinder and a manometer to monitor silica dust exposure.

    How about Your Vacuum?

    Does your vacuum have enough CFM to handle your wheel’s diameter?

    OSHA’s Silica Dust Exposure Law – Requires the following CFM Rating: 25 CFM or greater per inch of wheel diameter. For example, a 7″ wheel needs 175 CFM (7″ x 25 CFM).

    Final Rule – CFM Requirements

    To comply with OSHA’s Silica Dust Exposure Law, one of your first steps is to select a vacuum or cyclone that has enough CFM to handle the diameter of the grinding or cutting wheel that you will be using. Use the chart and information below to help you select the vacuum that will have enough CFM.

    Wheel Diameter * Required CFM Dust Director? Models – CFM Rating
    ** Vacuum Model – CFM Rating ** Cyclone Model – CFM Rating
    4.5″ 112.5 DD1000 – 130
    DD1200 – 130

    CP1200 – 160
    DD2000 – 220

    DD2000S – 260
    DD2400 – 270
    DD3900 – 342

    C2400S- 260

    C2400SD – 260

    C2400M – 260

    C2400B – 260
    C3900B – 420

    5″ 125
    6″ 150
    7″ 175
    12″ 300
    14″ 350
    16″ 400
    ?* OSHA’s Required CFM Rating:? 25 CFM or greater per inch of wheel diameter.
  • Airflow HEPA Filter System
  • AIRFLOW HEPA FILTER SYSTEM - Background, Filter Information

    AIRFlow HEPA Filtration – the Ultimate Filter System? The AIRFlow HEPA Filter System includes a HEPA Efficiency Pleated Cartridge Filter and your choice to use the Clean Extreme Filter Collection Bags or the Self-Cleaning Flutter Filter:


    Utilizing state of the art manufacturing and in house testing, the filter has been specifically designed to provide the performance required for the proper operation of a Dust Director? Vacuum.

    Wet & Dry Use + HEPA Rated + Longer Life with Applied PTFE Membrane: The Non-stick Dust Release & Water Shredding PTFE Membrane enhances the filter’s capabilities in several areas, including filtration efficiency (meets or exceeds a HEPA rating), cake release, cake prevention, “extreme” service life.

    A filter’s base fabric is typically made of woven or felted synthetic fibers, natural fibers or fiberglass. The membrane is a mechanically applied surface treatment (extremely thin, from 0.4 to 10.0 mils) that requires the filter’s fabric for support.

    Benefits of the Expanded PTFE in Dust Collection Applications:

    Dust Release & Water Shredding HEPA Cartridge Filter, included with each Dust Director Vacuum & Cyclone.

    Increases Filtration Efficiency to help meet EPA-mandated limits on exhaust emissions while providing the following benefits:

    1. Provides surface filtration rather than depth filtration (which is provided by conventional filter fabric). Surface filtration keeps the captured dust particles away from becoming impregnated into the base fabric, thus reducing fabric abrasion and extending the filter’s service life. With longer service life you won’t need to change the filter nearly as often which reduces your replacement cost and downtime during operations.
    2. Reduce pressure drop, cut energy (motor) costs. The membrane typically prevents pressure drop across the filter by about 10 percent. This in turn cuts wear on the vacuum’s motor(s) while reducing power consumption by as much as 33 percent!
    3. Extreme Dust Cake Release / Extreme Dust Cake Prevention. The expanded PTFE membrane is slicker than a conventional filter fabric and it easily releases any dust cake during cleaning.
    4. Most people purchase a vacuum cleaner based on improvements or features of the vacuum cleaner. The vacuum’s cartridge filter alone, applied with a PTFE membrane, will increase the vacuum’s performance by as much as 25 percent – thereby increasing production rates for your entire operational process.
    5. Extreme & Diverse Applications. The expanded PTFE membrane can withstand the most abusive of applications, dry or wet, and temperatures up to 600?F — highly suitable for high-temperature applications such as when removing hot mastics. Additionally, as stated, the filter is complete washable.
    6. 6) While the PTFE membrane increases the filter’s and vacuum’s cost, the initial cost is offset by improved filtration efficiency, vacuum performance and longer filter life.

    CLEAN EXTREME FILTER COLLECTION BAGS (3 included per vacuum):

    Clean/Extreme Filter Collection Bag. HD, cloth filter bag installs into any W/D vacuum, maintains suction performance, collect dry, wet, sharp debris.

    With a Clean Extreme Filter Bag installed you can expect to collect large volumes of silica dust – to the tank’s inlet port – without incurring suction drop or without the filter bag tearing or accidentally bursting inside the tank.

    Improve Productivity. How many times are you stopping to clean or maintain the vacuum’s filter or having to empty the tank all too often? With a Clean Extreme Filter Bag installed, suction power stops when dust begins to exit through the tank’s 2″ inlet port — fine powders collected and contained within the Clean Extreme Filter Bag will not cause blinding (i.e. the powder will not cake the bag’s lining, suction is not diminished.)

    When vacuuming any type of power, for hours at a time and you happen to notice suction drop . . . With a Dust Director Vacuum you simply turn off the vacuum, doing so will cause the Clean Extreme Filter Bag to deflate; when you turn the vacuum on the bag inflates and suction resumes 100% ~ Guaranteed.

    Are you grinding dry and you come across wet concrete, stone or mortar? No problem – Clean Extreme Filter Bags work even better when the surface is damp!

    Besides maintaining suction and collecting large volumes of powder without suction drop, Clean Extreme Filter Bags also collect: Moist debris, sharp objects and hot mastics ALL AT THE SAME TIME. Additionally, when you remove the filter bag you’ll notice that the inside that the inside of the tank, the outside of the bag and the HEPA cartridge filter are “clean”:

    Clean Extreme Filter Bags: Collects anything – powders to sludge – they fill to capacity, powders do not blind suction, no accidental bursting or tearing inside the tank or while being handled during disposal, and everything stays clean ~ Guaranteed.

    Extreme Filter Bags install into wet/dry vacuums with an inlet port - Tanks stay clean, cartridge filters stay clean - even after collecting 140 lbs. of dry concrete dust.
    HEPA Cartridge Filter Stays Clean
    Clean/Extreme Filter Bag: Large collection yields, everything stays clean including cartridge filter, tank & the outside of the bag.
    Tanks Fill To Capacity without Suction Drop
    Inside of the tank is kept clean.
    Clean / Extreme Filter Bag removed from tank - holds 140lbs. of dry concrete dust - inside of the tank remains clean.
    Outside of the Bag Stays Clean
    – Filter Bag Will Not Tear –
    Handling & Disposal is Easy
    Clean & Without a Mess

    FLUTTER FILTER – Optional Filter.

    Flutter Filter Basket - Constantly shakes, beats & flutters, prevents filter blinding without electronic pulsing.The Flutter Filter is a self-cleaning drop-in filter that may be used instead of the Clean Extreme Filter Collection Bag. As soon as the vacuum is turned on the tightly weaved “but loose fitting” Flutter Filter beings to flutter and shake, using the air speed and turbulence inside the collection tank to create its motion.

    Constantly and naturally in motion, dry debris and roughly 50% of the powders are kept from blinding the surface of the Flutter Filter and causing suction drop.

    Additionally, to help prevent blinding while the vacuum is on, a floating filter cage inside the Flutter Filter swings freely and loosely as it shakes and knocks itself about using the air speed and turbulence inside the collection tank.

    When you’re on a job site it’s nice to have options . . . with a Dust Director? Industrial Vacuum Cleaner you’re able to use either the Clean Extreme Filter Bags or the Flutter Filter.

    DD1000 Watt - Shown with Flutter Filter installed.

    Clean/Extreme Filter Collection Bag. HD, cloth filter bag installs into any W/D vacuum, maintains suction performance, collect dry, wet, sharp debris.The Clean Extreme Filter Bags are the absolute best filter system on the market for collecting “large volumes” of silica dust while maintaining maximum suction performance and for keeping everything clean inside the tank and even during removing and handling ~ everything is kept clean and there isn’t a mess.

    But the Flutter Filter works impressively as well, reduces or eliminates the cost of replacement filter bags, uses no electronics to shake or pulse itself clean and it is completely re-useable and washable.

    Flutter Filter – Specifications, Additional Features:

    • High Efficiency Filter Media, 96.5 @ 0.3 microns
    • Dry powders do not impregnate the material like commonly used “felt” filters
    • Keeps the vacuum’s HEPA Cartridge Filter from caking. While it may become dusty it will not cake.
    • Durable – Completely Washable
    • Versatile – Collects dry or wet debris without compromising its effectiveness.
  • Comparison
  • Still Using a Standard Wet / Dry Vacuum as a Dust Extractor?

    Shop Vac - 16 Gallon Tank with 2-1/2" x 6' Hose.
    Shop Vac – $94.97

    Ridgid Vacuum - with 2-1/2" x 6' Hose.
    Ridgid – $99.00

    Shop Vac - with 2-1/2" x 6' Hose.
    Shop Vac – $116.97

    Compare & Consider

    …Shop Vac and Rigid Vacuums have their place. We all have one.

    With OSHA’s Final Rule: You Will Get Fined Using a Non-Compliance Dust Extractor.


    OSHA's Silica Dust RuleOSHA’s Final Rule to Protect Workers from Exposure to Respirable Crystalline Silica

    Rule requires engineering controls (tools and equipment) to keep workers from breathing silica dust.

    What is Respirable Silica Dust? These tiny particles (known as “respirable” particles) can penetrate deep into workers’ lungs and cause silicosis, an incurable and sometimes fatal lung disease. Crystalline silica exposure puts workers at risk for developing lung cancer and other possible debilitating respiratory diseases such as chronic obstructive pulmonary and kidney disease.

    How Much Respirable Silica Dust is Safe to Breath? OSHA has issued their Final Rule to curb these respirable and kidney diseases in America’s work force by limiting a worker’s exposure to respirable crystalline silica to 50 micrograms per cubic over an 8-hour shift.

    Packet of sugar - example of 53 micrograms.What Does 50 Micrograms of Respirable Silica Dust Look Like? A good example may be one of those small paper packets of sugar or artificial sweeteners found in restaurants.

    When used to demonstrate the dust concentration inside a building, the size of a football field (100 yards x 53 yards x 14′ high). The weight of one of those little packets is 53 micrograms, which is slightly over the PEL (permissible exposure limit) for Silica Dust of 50 micrograms.

    Such a fine dispersing of dust at this concentration would essentially be invisibility. It is also enough to put the workers at risk by contaminating the work area — the size of a football field x 14′ high.

    OSHA’s Respirable Silica Dust Law – Effective: 23 June 2016. Since 1999, the Dust Director? has been involved with various organizations aimed at improving the health and safety on construction sites. On a meeting, dated 23 April 2014, the Dust Director? was invited to participate in a discussion about OSHA’s upcoming Silia Dust Standard. Besides the representatives from OSHA, the following organizations were also present:

    • NIOSH
    • CPWR (Center for Construction Research and Training)
    • Various university research scientists and professors
    • Health and environmentalist
    • Mike Kassman, National Safety Coordinator for the International Masonry Institute (IMI)
    • Jerry Scarano, Vice President of the International Union of Bricklayers and Allied Craft Workers (BAC).

    In past meetings, by the use of various air testing meters, NIOSH determined that the Permissible Exposure Limit (PEL) of a worker being exposed to silica dust should not be greater than 93.4. [On record, NIOSH tested the Dust Director? System (dust control guard and vacuum), and determined the complete system “provided the greatest reduction of capturing silica dust at 94% than any other vacuum and dust guard that was tested.]

    Currently, to simplify the understanding and importance of containing silica dust exposure, OSHA and all parties involved, have adopted the buzz phase of “visible dust,” as their measurement of whether silica exposure is being sufficiently contained for both the workers and public.

    CASE STUDY: Dust Left to Fly from a Skyscraper

    An interesting case study was provided by a Detroit contractor who was tuck pointing at a high rise office building in downtown Detroit, 35 floors above the sidewalks. A summarization of his findings on silica dust exposure is as follows:

    • Two workers were tuck pointing an office building, 35 floors up, without the use of dust control
    • The thinking was, to leave the silica fly and let it disburse into the sky . . . that it wouldn’t harm anyone or anything
    • As the safety coordinator for the company, he monitored the air quality of his workers
    • His air quality readings were as follows:
      • Employee “A” was working in air quality that measured 85 times over the NIOSH established PEL
      • Employee “B”, working downstream from employee “A”, was receiving a concentrated dose of dust as his air quality measured 135 times over the PEL!

    While this case study shows how “visible dust” may be seen, more importantly was the moral obligation we need to take for our construction workers, the public, and the environment.

    Dust Emissions — Does Your Vacuum Leak Dust?

    Dust linkage, from a standard type wet/dry vacuum.

    Dust linkage (rear view) from a standard type wet/dry vacuum.

    Check your vacuum! With OSHA’S “No Visible Dust Law”, is there a gasket beneath the motor head to seal the tank?

    With the OSHA ruling You will get fined using a vacuum that leaks.

    • With a Dust Director? Vacuum, Like-New Suction is Every Time –
      Unlike other vacuum cleaners where the same cartridge filter is used again and again and again . . .
    • With a Dust Directo? Vacuum, the HEPA cartridge filter stays clean.
      While it may get dusted, it will never become caked ~ Guaranteed.

    Poured in place urethane gasket, beneath the head of a Dust Director Vacuum.Urethane Motor Head Gasket. Beneath the motor head of every Dust Director? Vacuum & Cyclone is a poured-in-place urethane gasket that is used to ensure a positive airtight seal between the motor head and its tank. Commonly used shop vacuums and even higher priced vacuums will use foam or nothing at all.

    The urethane gasket ensures against dust leakage into your work area and prevents even the slightest loss of vacuum which would naturally reduce suction power. Many wonder how the suction of a Dust Director? Vacuum and Cyclone seems so much more powerful than other brands, one of the reasons is the urethane gasket.

    Dust Director’s Increase in Suction Power? While a complete Dust Director System (vacuum and dust guard) have been successfully monitored by NIOSH to operate within the guidelines of their established PEL, a very important feature in all of the Dust Director? Vacuums and Cyclones is the poured-in place urethane gasket.

    While some vacuums use foam as a gasket, 90% of all vacuums use nothing! This startling statistic includes vacuum’s that cost well over $2000 dollars. While the Rigid vacuum, for example, does not use any type of gasket (while leaking profusely), the consensus among morally conscience contractors is a Rigid vacuum is simply not designed to be used for silica dust containment.

    Dust Director? vs. the Competition:

    Bosch Vacuum.

    Fein Vacuum.

    Hilti Vacuum.

    Ridgid Vacuum.

    On a visit to masonry tuck pointers in Chicago and Detroit, the suction power of the Dust Director? Vacuums was compared to the Bosch 3931 Airsweep, Hilti VC20 and Fein Turbo I vacuums. Simply by placing our hand over the inlet port of each vacuum, the following was the agreed upon results:

    • Dust Director? Model DD1000: 15% greater suction vs. Bosch & Fein, 25% greater suction vs. Hilti
    • Dust Director? Model DD1200: Easily 20% greater suction than the DD1000
    • Both Dust Director? models where considerably lighter than Bosch, Fein and the Hilti vacuums.
  • Testimonials
  • Testimonials

    Feedback from Hardwood Floor Contractors

    I should have bought the 2-Motor – we haven’t used the 3rd Motor yet

    (Customer purchase our DC 3-Motor Vacuum)

    The vacuums hold so much dust. And there isn’t any filter maintenance. The filters simply don’t clog, they just keep sucking dust.

    We have a few of those real expensive pulse vacuums and the dust lays in the hose. We’re always having to lift and shake the hoses to get the dust out of them.

    Decorative Concrete Floor Contractor, Thousands Oaks, CA

    The Clean Extreme Filter Bag is remarkable. We fill the bags completely and there isn’t one spec of dust on the cartridge filter . . . The vacuums are work horses…

    Wood Sanding Contractor, Califon, New Jersey

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