Now let's look at some contenders for an entry-level dust collection system. Thickness planer, up to 13": 400 CFM, 190 l/s.Belt, disc, or drum sander: 350-550 CFM, 165-260 l/s (depending on size).Table saw, radial arm saw, miter saw, bandsaw: 350 CFM, 165 l/s.The article includes some typical CFM requirements for various tools, some of which I've included or summarized below. Although the worksheets in the article may look intimidating at first glance, they aren't too difficult to fill out. WOOD Magazine has a great article on calculating CFM and static pressure requirements for dust collection. When it comes to designing a dust collection system, the raw CFM figure is initially more important than the raw static pressure figure, though static pressure does come into play once you start designing your ductwork (more on this later). In simple terms, static pressure determines how much resistance (“static pressure loss”) your dust collector can overcome in order to move a given volume of air through the hoses and pipes. Static pressure is measured in inches of water (often referred to as inches water column, or inches WC), as in, how many inches the suction device can lift water up a pipe, or in millibar (mbar). Static Pressure, definedĪir volume is measured in cubic feet per minute (CFM) or liter per second (l/s)-the volume of air that the device can move from its intake to its exhaust in a given amount of time. But what does any of this really mean in practical terms? CFM vs. The others mentioned that a Shop-Vac produces low-volume air flow with high static pressure, and a dust collector produces high-volume air flow with low static pressure. On the other hand, a dust collector would be inappropriate and wouldn't work very well for most handheld tools. Short answer: A shop-vac is better than nothing, but barely adequate for dust collection on almost any stationary power tool.
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