Pulse Jet 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.

Pulse-jet baghouses collect dust on the outside of the filter. Dust-filled gas floods the bag house and clean air exits through the inside of the bag while the dust particles collect on the outside filter surface. A filter cage prevents bag collapse during filtration and aids in the redistribution and cleaning of the filter. A wide variety of filter bags can be manufactured to meet specific application needs. The pulse jet cleaning cycle is controlled by a solid-state timer which forces pulses of compressed air in the reverse direction of filtering, into blow pipes mounted above each row of filters.

When activated, the reverse pulse air pulses travel down the length of each bag in the given row, causing a ripple effect, dislodging and releasing the caked dust into the hopper at the base. A main advantage of the pulse jet baghouse is that it does not have to be taken off-line to clean the filters. With the dust removal programmed for regular or on-demand intervals, the system offers more complete cleaning and reconditioning of the filter bags than the other systems. Operating costs are minimal outside of the cost for compressed air for cleaning.

Types of Pulse Jets:

  • High Pressure compressed air; 80-100 psig; dust collects on the outside of the bag.
  • Medium pressure compressed air; 50-55 psig; dust collects on the outside of the bag.


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