common questions: Dust control? Here is some info that may be helpful on the subject of air cleaners. To determine the size or required air flow, use this formula: Volume of your shop (Length x width x Height) times Number of air changes per hour (typically 6 - 8) divided by 60. This will give you an answer in Cubic Feet per Minute which is how air cleaners are measured. Most air cleaner manufacturers rate the CFM of the fan only but there are losses due to the filters. If you are building your own or if the air cleaner you are purchasing rates only the fan, figure you will lose about 25 - 40% for filtering losses. As important as the air cleaner size is how and where you mount it. Try to mount at about 8-10 feet above the floor (no lower than 6' or 2/3 of the floor to ceiling distance if less than 8' ceiling) Mount along the longest wall so the intake is approximately 1/3 the distance from the shorter wall. Mount no further than 4-6 inches from the wall. The exhaust is the largest determiner of the circulation pattern. You are trying to encourage circulation parallel to the floor/ceiling. The exhaust is the clean air so that is what you want to position yourself in if you are looking for health benefits. If the dust has to pass your nose to get to the air cleaner, you get no benefits. If you have an odd shaped shop, two smaller units may be better than one large one. A couple of other thoughts. Do not rely on an air filter to act as a dust collector. Its purpose is to keep airborne dust in suspension and reduce airbourne dust as quickly as possible. Use a smoke stick (or a cigar) to observe and maximize circulation. Use a secondary fan to direct air to the intake if necessary. Also, consider that a standard 24" floor fan moves a lot of air and in some shops just positioning it in a doorway with a window or other door open can accomplish as much or more than an air cleaner. It's all in the circulation patterns. Finally, if you are looking for health benefits, you will not find any air cleaner manufacturer that makes health claims. No air filter will take the place of a respirator if health is a concern.
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