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DWS
Downflow Workstations >> DWS
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The DWS Downflow Workstation product line is based on an innovative Air Science® Multiplex Filtration Technology that creates a safe work environment over the widest range of applications in the industry.
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(pdf download)
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DUCTLESS TECHNOLOGY: The Eco-friendly Choice
Advanced carbon filtration technology offers a safe, high performance alternative to conventional ducted fume hood products for a broad range of applications.
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Environmental Benefits. Air Science® ductless fume hoods isolate and trap chemical vapors to prevent ecological impact through release into the environment.
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Versatile. Each filtration system is selected for its specific application. The Multiplex Filter broadens the range of applications. Carbon filters are available in more than 14 configurations for use with vapors or organic solvents, acids, mercury and formaldehyde. HEPA/ ULPA filters can add to biological safety.
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Easy to Install. The ductless fume hood is self-contained and does not require venting to the outside. Many units are portable and may be moved from one location to the next with minimal downtime and without filter changes. Set-up, operation and filter maintenance are straightforward.
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Energy Efficient. Because filtered air is returned to the room, no demands are required of the facility HVAC capacity for make-up air.
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Cost Effective. Facility ductwork, HVAC and construction costs are eliminated.
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Safe to Use. Workstation airflow and face velocity protect users from incidental exposures to fumes.
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Self testing. Electronic airflow monitoring assures continuous safety. An optional electronic gas sensor monitors carbon filter performance.
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APPLICATIONS
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DWS24, shown with optional mobile cart. |
A. Filter I.D. Window: A strategically placed front cover window shows the installed filter part number and installation date for convenience and to encourage timely filter replacement.
B. Control Panel: Electronic controls and displays include switches for the blower, low airflow alarm and electronic hour counter.
C. Steel Support Frame: The chemical resistant epoxy coated steel frame adds mechanical strength. Optional all polypropylene construction is available if desired; see accessories.
D. Electrostatic Pre-Filter: The 99.5% effective electrostatic pre-filter can be changed from below the work surface while unit is operating, to prevent user exposure to chemical vapors and powders trapped in the filter.
E. Color: The cabinet is white with blue trim; optional side panels and front sash are clear. (Black color also available, see Options and Accessories.)
F. Airflow Alarm: A continuous air velocity monitoring system alerts the operator upon unacceptable values.
G. Manual Speed Controller: The operator may set the centrifugal fan motor speed as desired.
H. Stand: Optional mobile cart with locking casters.
I. Work Surface: Under the perforated stainless steel internal work surface is a polypropylene tray to retain any spillage.
J. Filter Door Key: Filter access keys prevent unauthorized removal or accidental exposure to dirty filters.
K. Integral Lighting: A vapor proof fluorescent lamp illuminates the interior of the workstation.
OTHER FEATURES:
Side Panels and Front Sash: (Optional) When installed, optional side panels and optional front sash provide better containment of hazardous vapors. The Front Sash is easy to open and close.
270 Degree Visibility: Unrestricted user access to the front and sides of the workstation also admits ambient illumination and provides an unobstructed view of its contents.
Standards Compliant: Performance specifi cations and construction meet or exceed OSHA, ANSI and relevant international standards to assure operator safety.
Construction: All models are available in either metal or polypropylene construction. See selection chart for specifications and dimensions. Specify metal or polypropylene when ordering. Available in 110V, 60Hz or 220V, 50Hz models.
DWS DOWNFLOW WORKSTATION AIRFLOW PATTERN
DWS36, shown, right, with Multiplex Filtration System.DWS Downflow Workstations maintain a constant face velocity of 80FPM at the work surface in compliance with USA and international standards for safety and performance. Contaminated air is pulled through the Multiplex filtration system where activated carbon adsorbs chemical vapors and/or particulates if HEPA/ULPA filters are used. Clean air is returned to the room.
A. The main filter is easy to replace, no tools required. The filter clamps tightly against the filter gasket to prevent filter bypass and maintain filter integrity.
DWS DOWNFLOW WORKSTATION FEATURES & BENEFITS
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Available in 3 standard sizes, in metal or polypropylene construction, totaling 6 models.
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Wider units, comprising two or more workstations can be positioned side-by-side with junction connections option.
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High capacity air handling system delivers face velocity of 80 fpm at the work surface.
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A low airflow alarm warns of insufficient face velocity.
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The Air Science® filter assembly is easy to access, easy to change.
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A unique filter clamping design eliminates bypass leakage outside the cabinet.
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Accessories include an optional filter saturation alarm.
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Air Science® fume hoods use energy-efficient ebmpapst brand centrifugal blowers for long life, dependable performance. |
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Model
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Dimensions
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Weight (lbs/Kg)
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Metal
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Polypropylene
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Internal
Height
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External Dimensions
(W x D x H)
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Shipping
(W x D x H)
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Net
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Ship
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Standard Models
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DWS24
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DWS24-PP
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15.75"
400 mm
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24" x 22.75" x 31.5"
610 x 580 x 800 mm
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40" x 40" x 40"
1016 x 1016 x 1016 mm
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120 / 55
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160 / 73
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DWS36
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DWS36-PP
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15.75"
400 mm
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36" x 22.75" x 31.5"
915 x 580 x 800 mm
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40" x 45" x 40"
1016 x 1143 x 1016 mm
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131 / 60
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227 / 103
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DWS48
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DWS48-PP
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15.75"
400 mm
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48" x 22.75" x 31.5"
1220 x 580 x 800 mm
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40" x 55" x 40"
1016 x 1397 x 1016 mm
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185 / 84
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250 / 114
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Product Specifications
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DWS Model |
DWS24
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DWS36
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DWS48
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Airflow CFM
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145
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290
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435
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Face Velocity FPM
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80
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80
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80
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Noise, dBA, 1 meter
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< 52
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< 52
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< 52
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Lighting
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Compact fluorescent lighting.
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Construction
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White epoxy coated steel frame and head unit. Clear side panels. Stainless steel spill tray.
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Blower
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ebmpapst centrifugal fan.
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Electrical
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120V, 60Hz or 220V, 50Hz voltages available. Specify when ordering. Other voltage options available.
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Electrical Switches
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Main On/Off
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Monitoring
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Low airflow alarm, standard.
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Filter Specifications
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Pre-Filter
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Electrostatic, 1 lbs/ .45 kg (nominal)
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Main*
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(1) 22 lbs / 10 kg
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(1) 27 lbs / 12.3 kg
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(1) 27 lbs / 12.3 kg
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Standards & Compliance
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Quality Management Systems
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ISO 9001:2008
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Carbon Filter Efficiency
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BS 7989-2001
SEFA Standard 9
AFNOR NFX 15-211
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Biological Safety Filter Efficiency HEPA and ULPA
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IEST-RP-CC-0034.2
IEST-RP-CC007.1
IEST-RP-CC001-4
EN 1822
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Electrical Safety
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UL-C-61616A
CE Mark
ROHS Exempt under EEE Category 9
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Product Design
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ANSI Z 9.5-2003
ANSI Z 9.7-1998
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OSHA, Occupational Safety and Health Administration
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OSHA Standard -29 CRF, Safety and Health Regulations for General Industry, 1910.1450: Occupational exposure to hazardous chemicals in laboratories. Part B, definition, laboratory type hood. The DWS meets this definition when fitted with acrylic side window and front sash.
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Environment
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ISO 14001
Energy Star Partner
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Options and Accessories
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DWS Model |
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DWS24
DWS24-PP
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DWS36
DWS36-PP |
DWS48
DWS48-PP |
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Filter Saturation Alarm*
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An electronic gas sensor emits audio and visual alerts when the main filter needs to be changed.
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FSA
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FSA
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FSA
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Base Stand, Mobile, with Casters
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The 34" tall mobile cart provides a lower storage shelf; accommodates wheelchair access. Locking casters fix the hood in place.
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P5-CART
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P15-CART
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P20-CART
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Base Cabinet, Fixed
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Provides enclosed storage space. (specify: Yellow, Blue, White, locking casters or leveling feet)
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P5-ENCB
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P15-ENCB
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P20-ENCB
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ADA Compliance*
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Provides wheelchair access and lowered remote controls.
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All DWS models are available in ADA compliant configurations. Contact Air Science® for ordering information.
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Polypropylene Construction*
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Cabinets are available in all polypropylene construction. Contact Air Science® for information.
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DWS24-PP
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DWS36-PP
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DWS48-PP
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Stainless Steel Hanging Rod*
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Hanging rod spans the width of the cabinet.
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HANGR-XX
Must order ACRYLIC SIDE WINDOWS option.
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Side Windows Attachment*
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Transparent acrylic side panels for the downflow workstation.
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SIDE WINDOW
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SIDE WINDOW
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SIDE WINDOW
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Front Sash Attachment*
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Transparent acrylic front sash for the downflow workstation.
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Must order ACRYLIC SIDE WINDOWS option.
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Junction Connections*
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Connects two or more workstations to form a continuous unit with only one control system.
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JUNCT-FR
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JUNCT-FR
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JUNCT-FR
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Black*
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Metal units powder coated black; Polypropylene units made with black material.
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BLACK
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BLACK
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BLACK
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*Factory installed; specify when ordering.
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DWS36, shown in black with acrylic side option |
Filter Summary
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Formula
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Description
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GP Plus!
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The most widely used filter in the range, primarily for solvent, organic, and alcohol removal.
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ACI Plus!
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Neutralizes volatile inorganic acid vapors.
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ACR
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Iodine and methyl iodide vapors. It is frequently used for iodination reactions with low level radioactive iodine.
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ACM
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Mercury vapor.
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AMM
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Removes vapors from dilute ammonia solutions and to remove low molecular weight amines.
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SUL
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Designed to remove hydrogen sulphide and low molecular weight mercaptans.
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CYN
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Removal of hydrogen cyanide. Many cyanide compounds will evolve HCN gas if acidified, so this fi lter is normally specified if working with any cyanide compound.
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FOR
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Designed to oxidize formaldehyde and glutaraldehyde fumes. It is widely used in hospital pathology laboratories.
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ETH
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Diethyl ether is adsorbed on activated carbon, but because of its low boiling point, local heat adsorption can reduce the capacity of the filter. Special impregnation allows a chemical reaction which increases the filter capacity.
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HEPA / ULPA
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Powders and particulates.
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Enhanced Filtration Technology
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Universal filtration.
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