Shaker Style Bag Filters (Fabric Filter Bags)

Clean Air Matrix

RoboVent engineers are experts in every category of air filtration and ventilation. The four categories below represent the major options for treating your contaminated air. RoboVent has designed solutions for each of these categories and has manufactured air filtration systems of unrivaled quality.

For more information about these categories, see Indoor Air Quality 101.


Large blowers and air filtration equipment draw contaminated air from the plant (typically at the ceiling level), filter it and return it to the plant. This is a proven solution in plants welding large parts with overhead cranes. It reduces the haze in the air, resulting in a cleaner working environment, with no negative pressure or heat loss.


Air in the immediate area of the welding activity is captured in a hood system, then filtered and returned to the plant. This is the best solution whenever possible. It allows for a more flexible system and removes the smoke directly from the operator's breathing zone. There are many types of source capture, including overhead hoods, crossflow hoods, fume arms and fume guns, some of which work better than others.


Large exhaust fans draw contaminated air from the plant and exhaust it directly into the environment, typically through the roof or walls. This is a traditional method and often results in negative air pressure. Also, it is very difficult to climate-control your plant and the system may not work well in the winter.

Air in the immediate area of the welding activity is captured in a hood, sent through ductwork, and exhausted directly into the environment. This is a lower capital cost alternative to filtration, but tends to result in high operating costs and large, unsightly ducting systems that work less efficiently with modifications. It also results in negative pressure problems.

A shaker baghouse disposes of collected dust by shaking it out of the bags into a collection hopper at the bottom of the baghouse. Filter bags are hung and tensioned from the top of the filter housing and attached with the bottom open, to the tube sheet. The airstream enters from below the bags and is pulled upwards through the interior of the bags where the dust collects. The airstream passes through the filter bags trapping the contaminants on the dusty side. Clean gas is exhausted near the top of the collector.

A shaker style filter collects dust on the inside and is usually constructed from a woven media. Bags are installed with some slack in length, so that the shaker, if it provides for bag lift, can raise and turn the bag in a rapid shaking motion to develop a clean motion along the media surface, called a sinusoidal wave. Shaker bags require offline cleaning.

Shaker bags are typically seen in industries such as smelting, concrete, steel mills, and more.


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