Pocket Filters

Today’s building environments are becoming more packed with airborne particles. With factors included as increasing pollution, number of industries, poor hygiene and less number of filtration systems installed. Air cleaning and air filtration systems are highly important to get rid of a range of contaminants from the building’s environment. Pocket filters are one of the types of filters that are heavily being used for this purpose. The effectiveness of the pocket filter design or any air cleaning medium also depends on the nature of airborne contaminants. In this article, we will highlight some issues that must be considered before upgrading or installing filtration systems, if you want proper filtration and sorbent selection.

Filter bypass is one of the most common issues found in many pocket filters and HVAC filtration systems. The filter bypass happens, when air, instead of moving through a filter, goes around it, reducing the collection efficiency and overcoming the desired purpose of the filtration mechanism. The bypass is often resulted by poorly fitting pocket filters, their poor sealing in the framing systems, missing filter panels and openings and leaks in the air-handling unit between the blower and the filter bank. By just enhancing filter efficiency without addressing pocket filter bypass, there is only little benefit you can expect.

Another issue that is affected by the pocket filtration systems is cost. Lifecycle costs need to be considered (including cost of installation, replacement, running, maintenance etc). Not just are high efficient pocket filters more costly than the commonly used HVAC filters but also their fan units may need to be replaced to manage the higher pressure drop linked with the up-gradation of the system. Though high efficiency filtration usually comes at somewhat higher cost, you can still partially overcome these by accrued advantages, like cleaner and more effective pocket filters and clean indoor air with enhanced environmental quality.

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