1. Where can I find pricing for DualDraw equipment?
    • Every DualDraw unit is built-to-order based on our customers’ unique needs and specifications. Because there are so many variables when it comes to building the right equipment for each application, we do not offer comprehensive “off the shelf” pricing. Please email salesinfo@dualdraw.com, call 303-853-4083, or chat with a live agent on our website to get in touch with one of our experts and start the quotation process today.
  2. How do I know which model is right for my application?
    • Whether your process involves simple dust collection, combustible dust/gas collection, fume mitigation, mail screening and threat detection, 3D printing and additive manufacturing, or anything else that creates “dirty” air, we likely have a solution to help you breathe easier and make your facility safer. From portable downdraft tables to walk-in clean rooms, our product line contains a myriad of options to fit projects small and large. Email salesinfo@dualdraw.com, call 303-853-4083, or chat with a live agent on our website and let us help you find the right equipment for your application.
  3. My process involves flammability or combustibility risk; how does DualDraw mitigate this?
    • Ensuring our customers’ health and safety has always been our driving priority; we achieve this by going beyond simply cleaning your air. We have decades of combined experience in dealing with flammable and combustible material capture and meeting NFPA guidelines. While solutions vary from application to application, all our non-sparking units come equipped with aluminum work surfaces, motor and fan assembly parts, and Class II ASHRAE fire retardant filters to reduce the risk of errant sparks causing destructive and costly fires.
  4. Can DualDraw accommodate custom add-ons and equipment modifications?
    • Yes, we can! Each DualDraw unit is built-to-order with the consultation of our experienced and certified experts. From design to delivery, we work with you every step of the way to ensure your specific needs are met and your vision is brought to fruition. See the “Products” and “Applications” tabs on our website for examples of unique and custom products we’ve built in the past.
  5. What is the lead time for new equipment?
    • Lead time varies based on order size and current factory conditions; however, you can generally expect to receive your equipment within a month or two from date of order. While we always do our best to fulfill orders in a timely manner, we take pride in our work and refuse to cut corners when it comes to ensuring our customers’ health and safety. If you have an in-progress order and would like to know how it’s coming along, feel free to reach out to your account manager for an update or salesinfo@dualdraw.com.
  6. Does DualDraw offer expedited order fulfillment?
    • Yes, we do! We understand that some projects are more time-sensitive than others and will do everything in our power to accommodate your needs. For an added fee of 10-15%, we can move your order to the front of the queue to ensure expedited delivery. Please reach out to salesinfo@dualdraw.com, call us at 303-853-4083, or start a chat with a live agent on our website for an expedited equipment quote today.
  7. Does DualDraw sell pre-owned equipment?
    • Plenty of our current customers are operating on pre-owned DualDraw equipment; this is a testament to the longevity and robustness of our design. Whether your equipment is brand new or new to you, we’re here to help with any questions that may arise. Contact salesinfo@dualdraw.com, call 303-853-4083, or start a chat with a live agent on our website for more information on pre-owned equipment.

  1. Can I install and set up my new equipment on my own?
    • This depends on what type of equipment you’ve ordered. For example, the vast majority of our dry dust collectors arrive fully assembled and need only to be connected to your facility’s power to start operation. Our walk-in clean air stations tend to be much larger in size and require a varying level of assembly that you may want to have factory assistance in constructing. Our wet dust collectors generally arrive fully assembled; however, we require a Startup and Training be performed by a DualDraw Technician prior to operation due to their highly specialized nature. This is best performed in person by one of our certified field technicians to ensure all questions are answered and the equipment is optimized from the start, but these services can also be performed remotely via a conference call. Your account manager can provide guidance and options for installation regarding your specific application and equipment.
  2. Do I need a forklift to receive and install my equipment?
    • Most of our equipment is typically received and placed using a standard forklift with fork extenders, however, this is not always necessary depending on the size of your order. Be sure to consult with your account manager prior to delivery about your specific receiving and installation needs and where you may need DualDraw assistance.
  3. What is included in a Startup and Training from DualDraw?
    • Both onsite and remote Startup and Trainings are available to all customers, regardless of equipment type. If you have purchased an onsite Startup and Training, a certified DualDraw Technician will come to your facility after your equipment has been received and installed, ensure proper installation, perform testing and diagnostics to ensure optimal functionality, and train your operators on proper use, safety, preventative maintenance, and more. Startup and Trainings are required for all our wet dust collectors due to their highly specialized nature. Depending on your particular needs, there may be opportunity to add a customized start-up and training that could include more comprehensive installation services.
  4. My equipment was damaged during shipping – what should I do?
    • While very rare, sometimes units arrive with damage incurred while in transit. Regardless of whether delivery was facilitated by DualDraw or the customer, it is imperative to inspect your equipment for shipping damage prior to signing the Bill of Lading. If your unit is showing signs of missing or damaged parts, please document the damage and notify your account manager immediately so we can begin to make it right and get your equipment operational as soon as possible.
  5. My equipment arrived without an Operator’s Manual – how can I get a copy?
    • While all our equipment is shipped with a paper copy of its specific Operator’s Manual attached, sometimes this manual gets lost in transit or during installation. Please reach out to either your account manager or service@dualdraw.com and we will happily send an electronic copy of your Operator’s Manual.

  1. Why isn’t my equipment turning on?
    • There are several reasons why your equipment may not be turning on. First, check your power cord and make sure your unit is plugged into an operable outlet with voltage matching that of your equipment. Your unit will have an on/off switch or push button, be sure this is in the “on” position. Check for loose/disconnected wires in switch boxes, control panels, and junction boxes.
      If your unit is a Mailroom Inspection Workstation, ensure that the HEPA filter is sealed correctly and the safety button on the filter seal is depressed. Please call 303-853-4083 or email service@dualdraw.com if issues persist.
  2. My equipment seems to have very little suction – how do I address this?
    • First, visually inspect your equipment’s fan(s) for correct rotation direction. We have found that sometimes units are wired incorrectly during installation, causing the fans to rotate backwards. This is an easy fix; just have your electrician swap the lead wires to reverse fan rotation.
      Next, check your filter gauge. This gauge is used as a proxy to notify the operator when to change the filters based on our recommendation in the Operator’s Manual. Maintaining clean filters is paramount as the dirtier your unit’s filters become, the less capture velocity your unit will generate. If your process changes over time, the unit may need to be retrofitted with higher airflow. Please note, DualDraw configures each unit based on industrial hygiene requirements as they relate to the process being performed on the table surface and the airflow requirements to effectively capture airborne particulate. Our filtration systems are not meant to be vacuums but rather dust and fume collectors.  Vacuums have a high airflow, a low volume of CFM, and a small area for intake.  Our dust and fume collectors by design have comparatively low airflow, a high volume of CFM, and a large area for intake.
  3. Why isn’t my filter gauge registering pressure?
    • First, be sure that the unit is turned on and the fan is rotating in the correct direction. If the fan is rotating backwards, it will provide very limited suction and may not register on the gauge. Have your facility electrician swap the lead wires if your fan is rotating backwards.
      Next, check all air lines connected to the filter gauge. Ensure all lines are fully secured to their fittings and inspect for any kinks, tears, blockages, or anything else that may impede airflow. If all air lines appear to be in good condition, remove the lines and blow directly into the back of the gauge. If the needle still does not move, you likely have a faulty gauge and should reach out to service@dualdraw.com for a replacement.
  4. Why isn’t my equipment’s light turning on?
    • If your unit is equipped with a light and it’s not turning on, ensure first the unit is plugged into an operable outlet and the light switch is in the “on” position. Oftentimes, lighting will have its own 115V plug and cord that will need to be plugged into a standard outlet.  Next, check for loose/disconnected wires in switch boxes, control panels, and junction boxes. If issues persist, please call 303-853-4083 or email service@dualdraw.com for further guidance.
  5. Why isn’t my equipment capturing all the material from my process?
    • As previously noted, operators and managers should understand that DualDraw dust and fume collectors are not meant to function as portable vacuums. While our equipment does an exceptional job of capturing airborne particulates that would otherwise put facilities and operators breathing zones at risk, it is not designed to capture larger material debris created by your process. DualDraw configures each unit based on specific industrial hygiene and facility safety requirements as they relate to the process being performed on the table surface. These requirements focus on the health of operators and safety of facilities from particulate such as silica dust or combustible metal dust. If you have questions about the airflow of your equipment that have not been adequately answered in this FAQ, please consult with a member of our sales team at salesinfo@dualdraw.com.

  1. What does DualDraw offer in terms of Preventative Maintenance support?
    • DualDraw offers Preventative Maintenance plans for all our customers, regardless of equipment type or quantity. These plans include site visits from one of our technicians, which generally takes place on an annual basis and consists of equipment testing, diagnostics, cleaning, a complimentary filter change, re-training of operators if necessary, and in certain cases warranty extension. Please reach out to your account manager if you have further questions about DualDraw’s Preventative Maintenance plans.
  2. How do I order new filters?
    • Maintaining clean filters is one of the best ways to keep your DualDraw equipment functioning optimally. Please reach out to your account manager, call 303-853-4083, visit our web store at www.DualDraw.com, or email filtersales@dualdraw.com to order replacement filters for your equipment.
  3. How do I know when to change my pleated filters?
    • The main indicator for when to change your filters is the magnehelic pressure gauge located on your equipment. This differential pressure gauge measures the pressure increase from the dirty side of the filter to the clean side of the filter. As more particulate is accumulated on the filter, pressure will increase.  Ultimately, this build-up in material will decrease the airflow through the filters and the equipment will lose its effectiveness in capturing airborne particles. You will want to change your filters just before your equipment loses effectiveness.  We provide a recommendation in your Operator’s Manual of the setting on the gauge that can be used as a guideline when to change your filters. We recommend that you repeat our proxy test in your environment to provide a more accurate determination of the setting that you should use to change your filters. The proxy test for determining the gauge value at which to change your filters is to first note the gauge value when the unit is turned on and has brand new, clean filters installed. Then, turn off the unit, block approximately 75% of the filter area that is exposed to incoming dirty air with a piece of cardboard, close the filter door, turn on the unit, and note the change in pressure. For example, if your gauge is reading 2.0 with clean filters and 3.5 with the cardboard inserted, you will likely want to change your filters once the gauge reaches 3.5. Your flow will also likely be much lower at this higher reading, thus decreasing the effectiveness of your equipment to capture material. The cardboard blockage essentially simulates dirty/packed filters.
      It should be noted that different applications require different airflow to effectively capture the material being generated by an operator.  Therefore, ultimately the measured airflow at the capture zone of the operator is the best determination of when to change your filters.  The published industrial hygiene standard for the capture velocity of the particular application (for example mixing, grinding, and sanding all require different flows) will be your guide when measuring flow, using a calibrated anemometer.  For more specific guidance on airflow and filter changes, please consult your Operator’s Manual where there is extensive guidance on determining your Minimal Acceptable Threshold for airflow. or give us a call at DualDraw.
  4. How do I know when to change my carbon filters?
    • If your unit is equipped with a 2” activated carbon filter or a 12” activated carbon heavy-duty RSE module, these types of filters will need to get changed once they are saturated with whatever fume or VOC you are collecting. Most carbon filters will become saturated when they hold approximately 1/3 of their weight in substance.  For example, a 6 lb. carbon filter will hold 2 lb. of substance. Therefore, your best indicator of when to change/refill your filters will be to periodically weigh the filter and change once they acquire approximately 1/3 of their weight.  Using the 6 lb. carbon filter, this would be when the filter reaches approximately 8 lbs.  Since periodic weighing is often impractical, customers often use their sense of smell to determine when a change is needed. If you start to notice an odor related to your process (solvent, paint, welding fume, etc.) exhausting out of the unit, your carbon filters are likely full. Using smell as your guide is not advised given the hazardous nature of some toxins being captured in these types of filters.  Sensors are a more effective and safe way of using “smell” to determine the increased presence of a substance, indicating a need for a filter change.  Last, since carbon interacts with the ambient air and will absorb particles over time, this type of filter will need to be changed periodically based on time instead of usage.  Average timespan for carbon web filters before changing is three months, and six months for RSE modules. To determine more accuracy of timing for your application, contact DualDraw and we can work with you to have a saturation test performed and obtain more precise data on the recommended change frequency.
  5. How do I change my filters?
    • Start by locating your filter door(s). These doors are usually located on the front of the unit below the work surface on dry dust collectors, on top of the unit for wet dust collectors with HEPA after filters, on the back of the power walls for walk-in units, and underneath the removeable grates on mailscreening units. Turn each knob on the filter doors clockwise until the latches disengage and remove the door to access your filters.
      To remove your filters, simply loosen the top and bottom knobs holding the filters in place and remove the pre/carbon filters from your unit. If your unit is equipped with HEPA filtration, this filter will be removed last. Replace all removed filters, paying special attention that the directional arrows are pointing towards the motor assembly. Tighten the filter knobs to ensure a good seal, replace the filter door, and tighten.
  6. Why are my filters getting dirty so quickly?
    • The rate at which your filters become dirty depends entirely on your application, process, and frequency of use. Because of this, DualDraw can’t prescribe a specific filter change schedule for each customer – this is something that you need to ascertain during the first few months of operation. Some applications require daily filter changes, while others require monthly, quarterly, or even annual changes. See the “How do I know when to change my filters?” FAQ above for guidance on when to change your filters.
  7. What are the Preventative Maintenance procedures for my equipment?
    • Preventative Maintenance procedures vary from model to model. With dry units, you should empty your dust trays daily (if equipped), regularly inspect the interior of your unit (inside the filter housing and under the table grates) and clean as necessary and change your filters on a regular basis.
      Wet dust collectors require more attention to Preventative Maintenance than dry units. Please reference your Operator’s Manual for in-depth guidance.
      Note: All PM procedures should be conducted with the unit powered off.
  8. Why is it important to keep my unit clean?
    • Implementing a comprehensive Preventative Maintenance schedule for your unit is one of the best ways to protect your investment in DualDraw equipment and help make your facilities safer, cleaner, and healthier for years to come. In other words, the cleaner you keep your equipment, the better it will work to protect your facility and operators. The dirtier your unit becomes, the less capture velocity it will generate, increasing the chance of unwanted particulates escaping into your facility’s atmosphere and potentially compromising your operators’ health and safety.
  9. My unit is for fume control – how come I still smell fumes?
    • If you smell fumes related to your process being exhausted from your unit, this is a strong indication that your carbon web filter or RSE module is ready to be changed. While carbon does an exceptional job of capturing fumes, it has a relatively short useful life (around three months for carbon web and six months for RSE). Note that your carbon filters should be stored in their sealed packaging until ready for use to prolong lifespan.

  1. How do DualDraw Wet Collectors work?
    • Our Wet Collector series uses liquid as its filtration – often required in applications that produce combustible dust. The DualDraw WC design scrubs the “dirty” air and safely returns clean air back into the facility. Customers also have the option of venting outdoors if desired, as well as adding a HEPA after filter for an added layer of filtration. The WC series is available in both table and booth configurations.
      The Stand-Alone Wet Scrubber, or “SAF-WS” series can be ducted to one or multiple pick-up points – these scrubber dust collectors are an excellent choice to capture combustible dust from a fixed hood, enclosure, or machines with a duct connection such as a grinder. Our Wet Scrubbers are configured to maintain NFPA required duct velocities for the transportation on combustible dust. The SAF-WS series can also be configured as a Wet Walk-In Clean Air Station for maximally efficient collection and containment.
  2. What is the optimal water level for my Wet Collector?
    • Maintaining an optimal water level is the most important factor to achieve maximal performance for your Wet Collector and is one of the reasons why we require customers to receive Startup and Training support from DualDraw before operating their new Wet Collector. There are several variables, such as model, application, process, and facility environment that dictate the unique optimal water level for each WC unit.
      Once your DualDraw technician has set the optimal water level for your Wet Collector, it is extremely important to monitor your equipment and ensure this water level is maintained. Failure to do so can result in loss of performance, decreased production efficiency, and potential damage to your WC unit.
  3. How often do I need to clean my Wet Collector’s tank?
    • Clean sludge from the bottom of the sump tank daily, particularly if material is combustible such as aluminum. Daily cleaning of the WC sump is a requirement as per NFPA 484. Ensure that water the water line to your probe system (if equipped) is free and clear of debris and flush if necessary. Sludge should be stored and disposed of based on local municipal waste guidelines. If material loading is high, contact DualDraw for automated sludge removal options.
  4. How often do I need to drain and refill my Wet Collector?
    • Drain and refill frequency varies based on model, application, process, and facility environment. For most customers this is a monthly requirement, although it can be done quarterly for lighter applications. After draining water, remove all accumulated sludge buildup in the tank. If ferrous metals are handled in the scrubber, solid oxidation in the bottom of the tank could be present, which is harder to remove, and you should increase the frequency of sludge removal.
      When refilling your unit, be sure to fill to the optimal water level set by DualDraw to ensure optimal performance.
  5. How often do I need to clean my Wet Collector’s dehumidifiers?
    • To access the dehumidifiers, remove the back panel door and pull the dehumidifiers out of the unit. Wash as required upon visual inspection. This should be done daily during the first few weeks of operation and weekly once a PM schedule is fully established.
      To clean, gently wash dehumidifiers with warm water and detergent. Low pressure power washing is also acceptable (100 psi or lower); higher pressure will deteriorate dehumidifiers. Shake/tamp dehumidifiers to dislodge particulate buildup. DualDraw recommends having a second set of dehumidifiers on hand so a hot swap can take place while one set is being washed.
  6. How do I reset the alarm on my Wet Collector?
    • If you experience a high/low pressure or water level alarm on your Wet Collector, a reset must be performed before continuing operation. First, silence the alarm by pressing the “Alarm Silence” button on your control panel. Next, try to ascertain the reason for the alarm and take the necessary steps to alleviate the issue (increase/decrease water level, clean dehumidifiers, change HEPA afterfilters, etc.). Before continuing operation, press the “Alarm Reset” button on your control panel. The reset button reconfigures the relays to their original state. If you are experiencing frequent alarms, please call 303-853-4083 or email service@dualdraw.com for support before continuing operation.
  7. Why is there mist exhausting from my Wet Collector?
    • When misting or weeping occurs, the water in the system is at a level where the airflow is carrying water through the system, up and through the fan wheel, into the fan housing. This will manifest itself either by misting out the exhaust or weeping down the upper sides of the unit. The presence of this condition signifies that the water level needs to be adjusted. Please see your Operator’s Manual for more information on troubleshooting excessive moisture issues.
  8. Why is my Wet Collector shaking?
    • DualDraw wet systems have a natural rhythm of the water rushing through and returning to the sump through an internal baffle system. Minor pulsing of the system is to be expected, however, if pulsing gets to be more aggressive this condition will need to be addressed. More aggressive pulsing, or jumping, is typically caused during higher water level situations, such as after the unit fills itself with water (a “fill action” when higher pressure is built up in the system). Most often in SAF scrubber systems, this is demonstrated by the door(s) to the sump “jumping” from their fixed position. When this becomes more aggressive, the system needs to be adjusted. When not addressed, could have long term effects on the condition of the fan, the welds on the sump, and the overall airflow dynamic of the system. Please see your Operator’s Manual for more information on troubleshooting excessive pulsing issues.
  9. The autofill function on my Wet Collector appears not to be working – how do I address this?
    • The cause of an autofill malfunction depends on several factors, but there are a few troubleshooting steps to take before contacting DualDraw for additional support. First, check to make sure the incoming water valves on your unit and at your facility are in the “open” position. Test that your facility water is functioning properly by depressing and turning the manual fill ball valve located next to the autofill solenoid. Check the autofill solenoid wiring for loose/dropped connections inside the control panel. If issues persist, call 303-853-4083 or email service@dualdraw.com for support.

  1. What are DualDraw Mailscreening units used for?
    • DualDraw Mailroom Inspection Workstations are designed based off our TB downdraft booth platform with multiple size options available. Our Mailscreening booths protect your mailroom staff from a wide range of CBRNE threats (chemical, biological, radiological, nuclear, explosive), as well as potentially lethal narcotics such as fentanyl, by containing airborne threats until the mail is deemed safe for delivery. When used in conjunction with our industry-leading detection partners, our solutions are considered the standard for safe and secure mailscreening.
  2. Who uses DualDraw Mailscreening units?
    • DualDraw offers mailscreening solutions for anyone who is at risk of receiving harmful threats through the mail. Whether this be local, state, or federal law enforcement, correctional facilities, high net worth individuals, or other government entities, we currently have hundreds of Mailscreening units keeping people safe throughout the country.
  3. How often do I change the filters on my Mailscreening unit?
    • The vast majority of our Mailscreening booths come equipped with one prefilter, one carbon web filter, and one certified HEPA filter. The prefilter and carbon web filter should be changed quarterly, while the HEPA filter should be changed annually. Feel free to call 303-853-4083 or email filtersales@dualdraw.com for more information on Mailscreening filtration.
  4. How do I change the filters on my Mailscreening unit?
    • Changing the filters on your Mailscreening unit is a quick and simple process. Start by removing the grates from the work surface of your booth (we recommend using a flathead screwdriver to lift the first grate, then remove the rest by hand). Now that your filter compartment is exposed, remove the carbon and prefilter by lifting them up and out of the filter compartment. The HEPA filter should be changed annually by a DualDraw technician as part of your Preventative Maintenance plan. Replace your prefilter and carbon filter in the same orientation they were removed, taking special care that the directional arrows on each filter are facing towards the motor compartment. Ensure that the filter cage is snug against the HEPA filter and replace table grates.
  5. What does DualDraw offer in terms of Preventative Maintenance support for Mailscreening?
    • DualDraw offers Preventative Maintenance plans for all our customers, regardless of equipment type or quantity. These plans include an annual site visit from one of our technicians, which generally consists of equipment testing and diagnostics, cleaning, a complimentary filter change, re-training of operators if necessary, and warranty extension. Please reach out to your account manager if you have further questions about DualDraw’s Preventative Maintenance plans.