Rigid Box Filters

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.

This filter style is often used as secondary air filter or as the final filter in an air system. Often referred to as a box filter, these filters are designed to work best in Variable Air Volume (VAV) systems, where air speed volumes can change. Rigid box air filters are deeper than pleated panel air filters and have a sturdier frame. They remove contaminants from the air stream so the contaminant buildup doesn’t ruin equipment. They also improve indoor air quality. The rigid frame of the filter can withstand fluctuations in airflow which makes these filters ideal for variable-volume HVAC systems.

These filters provide medium/high efficiency filtration in settings such as office buildings, hospitals, industrial plants, museums and schools. These filters have a MERV rating of 8 to 14. A filter's MERV rating measures how efficiently it removes contaminants from the air stream based on the size of the particles it can effectively capture. The higher a filter's MERV rating is, the more effectively the filter traps small particles.

Our Extended Surface Rigid Cell filters provide high efficiency removal of multiple contaminants for a variety of applications from museums to semiconductor facilities.

Types of Rigid Box Filters We Offer:

  • CarbonWeb Rigid Filter
  • CarbonWeb Plus Rigid Filter


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