A filter assembly is provided which includes an outer filter sleeve formed at least in part by a plurality of pleats, an inner filter sleeve formed at least in part by a plurality of pleats, wherein the inner and outer filter sleeves define a passage therebetween. Conferencing endpoints are linked by pairs of a reliable and a less reliable communication channel. A user configures the portal server to deliver manufacturingprocess control information associated with a controlled process environment, such as a food processing plant floor or an oil refinery reactor, to the user via a browser client over the Internet or a corporate intranet. The individual sub-arrays are beamformed, e.