Recirculating fume hoods aka benchtop ductless fume hoods are the benchtop enclosures. They use HEPA filters or self-contained carbon filters to eliminate particulates, vapors, and fumes from the air-flown into the device and the air is recirculated back into the lab. It does not release the toxic fumes into the environment. It has an activated carbon filter to neutralize the pollutants.

The ductless fume hoods are developed for improved performance at reasonable rates. They find usage in forensic laboratories, educational facilities, and research laboratories. Some features and benefits of benchtop ductless fume hoods are mentioned below:

Specification Of Laboratory Benchtop Ductless Fume Hoods

Features and Benefits

They make use of LED lighting to save your energy bill. It comes with EC blower for improved efficiency. It is provided with low air alarm to show the user about insufficient face velocity. The filter clamping design in the unit prevents the leakage from the outside surface of the cabinet. It protects the user from particle hazards and fumes.

The control panel in the unit comprises displays and electronic controls. It comprises switches for low airflow alarm and blower.

The unit has an analog air velocity meter. The filter ID Window is conveniently positioned and shows the part number of the filter and time to replace.

It is sturdy with epoxy coated steel frames. You can also opt for complete polypropylene construction. The users can fit an optional stainless steel tray or polypropylene tray in the internal workspace.

The unit has a hinged front sash to safeguard the contents from external contact. You can easily open and close the sash. You can access the electrostatic pre-filter from inside of the chamber. It is highly effective with accuracy down to 1 to 3 microns.

To prevent contaminated air leakage, it pressurizes the fan plenum. It allows setting the speed of the EC Blower. The system has a key to prevent accidental exposure to the dirty filters or thwart unauthorized removal.

Side and back panels allow 360-degree visibility into the chamber with ambient illumination. It allows the user to clearly see the contents.

Operating Voltage

The users can select the unit for operation either with 220V, 50 Hz or 110 V, 60 Hz.

Advanced ductless fume hoods

Those searching for high efficient products to protect the environment and the operators from harmful vapors can select advanced ductless fume hoods. It uses multiplex filtration technology. It delivers 100 fpm air velocity.

Energy efficient

It uses recirculation method and saves energy. It returns the filtered air back to the room. It is economical and safe to use. It has a portable construction and facilitates easy installation.

Technical specification of ductless fume hood

The 2 feet width model comprises blower switch, test port, activated carbon filter, and fan. It has pass-through ports for service connections. You can also opt for a microprocessor-controlled system.

Specification Of Laboratory Benchtop Ductless Fume Hoods

The microprocessor-controlled benchtop ductless fume hoods have a normal size of 0.9 meters, 0.6 meters or 1.2 meters. The external dimensions of the 1.2-meter unit are 1140x700x1125 mm. Its internal work area dimensions are 1116x651x855 mm. It has an air volume of 138 cfm. It’s sound emission is less than 58 dBA. Its BTU/Hr is 580. The high-end version has a weight of 105 Kg.


Tahir Farooq is blogger and tech enthusiast with years of experience. You Can Follow Me Face Book>>