Circuits Assembly Online Magazine - Metcal Introduces Two-Arm Fume Extraction System

Metcal (Menlo Park, CA), a division of OK International, has introduced a compact, portable two-arm fume extraction system that combines strong fan performance with efficient filtration and quiet operation. Metcal enlisted the fume extraction expertise of Impell, another OK International division, to develop the system.

Building on Metcal's existing single arm system, the new unit features the same motor as the single-armed model, but has a one-stage impeller design that provides more than double the total free-blowing airflow. A proprietary impeller was chosen to maximize performance while keeping size and weight to a minimum. The result is a unit that can be easily transported by one person without strain.

Maximum free-blowing airflow is rated at 250m3/h, with maximum suction force at 850Pa. The 850Pa rating provides capability to handle any clogging that occurs during normal filter life.

The system's pre-filter is the best in class for this type of portable fume extraction system, while the main filter offers HEPA efficiency of more than 99.5% and an activated carbon filter.

The filtration system features a significant amount of activated carbon and a large filter area, to provide a long filter life and protection against clogging. The activated carbon makes the unit efficient at filtering gases.

The filter system has been designed to allow the pre- and main filters to be changed individually. The filters can be changed by undoing a latch on the side of the unit.

In operation, the stand-alone unit does not require a separate compressor or external ducting; it only needs to be plugged into a power source to be ready for use. The unit is designed for a universal power supply ranging from 100 to 240 VAC and 50 or 60Hz.

The unit is compact enough to be located under, or next to, the workbench. It can be used with either two 2-in. (50-mm) diameter hoses and BVX arms, or one 2.5-in. (67-mm) hose and an Omniflex arm. The single arm offers a 50% higher airflow than one of the smaller arms, with airflows per arm rated at 75m3/h and 110m3/h respectively.