Debunking the Myth of "Regain"

August 15, 2022 by
Debunking the Myth of "Regain"
ProVent, LLC


In the realm of dust collection systems, the quest for enhanced efficiency and effectiveness is an ongoing endeavor. One trend that has garnered attention is the concept of "regain" air flow, touted as a solution to boost dust collection performance in booths and down draft benches with enclosures. However, a closer examination reveals that the supposed benefits of regain air flow may be more myth than reality. In this article, we delve into the truth about regain air and why it may not be the panacea it's often portrayed to be.

Dispelling the Illusion:

Regain is marketed as a means to increase performance in booths and down draft benches by redirecting exhaust air back toward the work area.  Proponents argue that this approach enhances dust collection efficiency by creating a "push" to increase velocity and force more particulates towards collection inlets.  However, upon closer scrutiny, several drawbacks come to light, casting doubt on its efficacy and practicality.

Concentration of Contaminants:

One of the primary concerns with regain is the concentration of contaminants around the worker's breathing zone. While standard filters in dust collection systems can effectively capture the majority of particulates, a small fraction still pass through. By redirecting exhaust air back at the worker, this residual particulate is concentrated in the immediate breathing zone of the worker, increasing the risk of inhalation and exposure to the finest, most hazardous particles.

Disruption of Airflow:

Moreover, the introduction of return air flow disrupts natural linear airflow dynamics created within the enclosure. Optimal airflow is uninterrupted linear flow.  This requires smooth and consistent movement of fresh air into the system. However, the addition of return air flow creates turbulence which in turn creates eddies and dead zones, around the worker and the material being processed. This turbulence compromises the effectiveness of efficient linear flow and thereby dust capture, potentially leading to higher dust levels and increased worker exposure.

Costly Add-On:

Regain air is simply an unnecessary expense with no meaningful benefit. The interruption of linear flow pattern and return of exhaust air through the worker breathing zone create a less efficient and less safe system for additional costs.

A Pragmatic Approach to Dust Collection:

In conclusion, while the idea of "regain" air flow may seem appealing on the surface, its practical utility in dust collection systems remains dubious. Rather than investing in costly add-ons with questionable benefits, industry professionals are better served by focusing on proven methods of dust control. By prioritizing worker safety and environmental stewardship, companies can create healthier and more productive work environments without resorting to gimmicks or unnecessary expenditures.


The truth about regain air in dust collection systems is clear: it's a well-intentioned concept that falls short of delivering meaningful improvements in efficiency and safety.  As industries strive to uphold stringent standards of workplace safety and environmental responsibility, it's crucial to approach dust collection with a discerning eye and a commitment to evidence-based practices. By dispelling myths and embracing pragmatic solutions, we can ensure that our dust collection efforts yield tangible benefits for workers, businesses, and the environment alike.

Share this post
Our blogs