There are several methods available to reduce the risk of a dust collector fire. The most effective measure for reducing your fire risk is to add a spark arrestor to your dust collector.
Most of the traditional spark arrestance methods rely on physical interventions to prevent sparks from entering the dust collector. Sometimes baffles or metal meshes are used to interrupt a spark’s trip into the collector. The hope is that bouncing off of these surfaces causes a spark to lose its thermal energy. Another method is to create an area of turbulence within the ducts before a spark can reach the filter. This turbulence can kill sparks, at least in theory.
Unfortunately, these methods have serious drawbacks, including a high failure rate. If a spark is large, it might have too much thermal energy to be dissipated by these measures. Or the spark might fly past the devices altogether. These methods carry other negatives, as well, including a loss in efficiency. For example, installing meshes in your ductwork often forces you to increase your airflow, which is an added expense.
The RoboVent’s Delta3™ Spark Arrestor has been designed to kill sparks rather than mitigate them. In comparative studies, it killed 99.9% of sparks, a far higher number than other types of spark arrestors. The Delta3 achieves this by creating centrifugal force to fling sparks against the wall of the device, quickly extinguishing them. RoboVent’s engineers used Computational Fluid Dynamics software to design this device to kill sparks while keeping airflow smooth and uninterrupted.