Ductless Fume Hood

General Application Ductless Fume Hoods

Purair Basic ductless fume hoods are designed to protect the user and the environment from hazardous vapors generated on the work surface. These energy-efficient fume hoods feature a single EC blower motor consuming only 22–50 watts, making them among the world's most energy efficient ductless fume hoods. Available in 24", 36", and 48" widths.

Applications

• Compounding
• Balance Enclosures, Microscopes, and Robotic Equipment
• Forensics
• Histology
• Educational
• Microscopy
• Mobile and Classroom Demonstrations
• Pharmaceutical
• Powder Fingerprinting
• Powder Weighing
• Sample Prep Work
• Soldering
• Solvent Cleaning and Welding
• Veterinary
• Dental

Key Features

• High efficiency ebm-papst EC blower
• Energy saving LED lighting
• Protects the operator from fume and (with added HEPA/ULPA filter) particle hazards
• Improved filter clamping eliminates bypass leakage
• Low airflow alarm
• Meets or exceeds OSHA, ANSI, and other international standards
• Face velocity of 100 fpm in compliance with US and international safety and performance standards

Ductless Technology Benefits

Environmental Benefits

Air Science ductless fume hoods isolate and trap chemical vapors to prevent ecological impact through release into the environment.

Versatile

Each filtration system is selected for its specific application. Carbon filters are available in more than 14 configurations for use with vapors of organic solvents, acids, mercury, and formaldehyde. HEPA/ULPA filters can be added for biological safety.

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 with minimal downtime and without filter changes. Set-up, operation, and filter maintenance are straightforward.

Energy Efficient

Because filtered air is returned to the room, no demands are required of the facility HVAC capacity for make-up air.

Cost Effective

Facility ductwork, HVAC, and construction costs are eliminated.

Safe to Use

Cabinet airflow and face velocity protect users from incidental exposures to fumes.

Self-Testing

Electronic airflow monitoring assures continuous safety. An electronic gas sensor monitors carbon filter performance (select models).

Design Features

• Filter I.D. Window: A convenient, strategically placed front cover window shows the installed filter part number and installation date to encourage timely filter replacement
• Control Panel: Electronic controls and displays include switches for the blower and low airflow alarm
• Airflow Alarm: Low airflow alarm continuously monitors filter loading and alerts user when service is needed
• Air Velometer: An optional analog air velocity meter is positioned in the user's field of vision
• Steel Support Frame: The chemical resistant epoxy coated steel frame adds mechanical strength. Optional all polypropylene construction is available if desired
• Hinged Front Sash: When closed, the cabinet sash protects the contents from inadvertent external contact and better isolates the air within. The sash is easy to open and close
• Work Surface: The internal work surface can be fitted with an optional polypropylene (available in white and black) or stainless steel tray
• Pass Through Ports: Electrical cords and cables are safely routed into the cabinet through ports on the back
• Electrostatic Pre-Filter: The electrostatic pre-filter is accessible from inside the chamber and 91% effective down to 1-3 microns
• Filter Door Key: Filter access keys prevent unauthorized removal or accidental exposure to dirty filters
• Dynamic Filtration Chamber: The dynamic filter chamber prevents any possible leakage of contaminated air by pressurizing the fan plenum (positive air) and depressuring the filter compartment (negative air)
• Internal Manual Speed Controller: Authorized personnel may set the EC blower speed as desired
• 360 Degree Visibility: Clear back and side panels allow ambient light into the chamber and provide users with an unobstructed view of contents
• Construction: All models are available in either metal or polypropylene construction. Available in 120V, 60Hz and 230V, 50Hz models

Filtration Technology

At the heart of the Purair product line is innovative filtration technology. The Multiplex Filtration System consists of a pre-filter, main activated carbon filter, and optional HEPA/ULPA filter. The system permits a customized combination of filter media and configuration for chemical and physical adsorption specific to each application need.

The Air Science carbon filtration technique is based on enhanced, activated carbon particle formulations from specially selected, naturally occurring raw material that is superior to wood or other organic sources. The carbon is treated to attain the proper porosity and aggregate surface area and to react with several ranges of aerosolized chemicals moved through the filter by an air handling blower.

The system can be configured for the capture of acids, bases, and particulates, such as biological aerosols, when paired with HEPA or ULPA filters.

Airflow

Contaminated air is pulled through the Multiplex Filtration System. Activated carbon adsorbs chemical vapors and optional HEPA/ULPA filters capture particulates. Clean air is returned to the room.

The main filters are easy to replace with no tools required. The filter clamps tightly against the filter gasket to prevent filter bypass and maintain filter integrity. The pre-filter may be replaced while unit is in operation.

Filter Configuration

The Multiplex feature permits one or more filtration options to be combined to meet a wider range of multiple-use applications. The Purair Basic can be equipped with a single activated carbon main filter or with a stacked configuration which combines two main filters, each activated to adsorb one or more specific vapors or family of vapors. For safety against particulates, an optional HEPA or ULPA filter can also be added. When used with a HEPA/ULPA filter, the ductless fume hood may be applied as a Class I Biological Safety Cabinet.

The carbon filter is sized to fit the specified product model number and configured to optimize airflow across 100% of the filter surface area. The self-contained assembly maximizes filter efficiency, prolongs filter life, optimizes diffusion and saturation, and improves user safety.

Filter Components

• Electrostatic Pre-Filter: Protects the main filters from aerosols, mists, dust, and particulates
• Activated Carbon Main Filter: A single or stacked filter configuration
• HEPA/ULPA Filter, Optional: Both HEPA and ULPA filters use micro-glass fiber media designed to capture fine particles and biologicals. Both filters can capture particles smaller than the micron size for which they are tested. HEPA and ULPA filter efficiencies are 99.995% at 0.3 microns and 99.9995% at 0.12 microns respectively

Control Options

Basic Control Panel

Standard on Purair Basic models and includes an On/Off switch and low airflow alarm.

FSA/Autocal Control Panel (Optional)

Displays the airflow and uses an electronic gas sensor to detect when the filter needs changed. Audio and visual alarms alert users to filter saturation and attainment of preset airflow thresholds.

Model Dimensions and Specifications

Standard Depth Models (XT)

Reduced Depth Models (XTS) for countertops 24" or less

Product Specifications

Filtration Performance

Construction Specifications

Efficiency Specifications