Table of Contents. Because replacements for these filters cost 4—5 times more than the prefilters, be sure to keep the prefilter clean or replace it ifltration to preserve the inner filter. Customer Service. The air filtration system will operate for 2 hours then shut off. However, the Grizzly G improved vastly from minutes using its original filters to just 33 minutes with the AFF filters. All the rectangular-box machines have a prefilter and secondary pocket filter. Inner Filter for AFS

The box fan dropped off the most, eventually stabilizing at 30 percent, followed by the Rikon 28 percent and Powermatic PM 23 percent. We tested these systems in an cubic-foot shop space walled off with plastic floor to ceiling. Then we sanded MDF with a drum sander using grit sandpaper, and no dust collection.

The chart above shows how well each machine filtered dust in our trials. Both Jet units scrubbed the air in 13 minutes at high speed. Curiously, both Powermatic models cleaned the air about 60 percent faster at their slowest speeds. The good news: Each machine was able to return the air to the control level.

Obviously, the larger the shop space, the more time each machine will likely need to clean the air. All the rectangular-box machines have a prefilter and secondary pocket filter. Both are easily accessible for cleaning.

Eight of nine tested air-filtration systems have two sets of filters, as shown above. The prefilter, made of spun nylon or pleated fabric, captures larger dust particles 5 microns or larger , and can be cleaned with compressed air or a shop vacuum.

Most prefilters will eventually need to be replaced after cleaning no longer improves their performance. The Powermatic PM, below , has a screen rather than a traditional prefilter. Because replacements for these filters cost 4—5 times more than the prefilters, be sure to keep the prefilter clean or replace it often to preserve the inner filter.

As dust particles build up on the filters, airflow drops off, but filtration improves. We suggest erring on the side of caution and cleaning the prefilter about every 7—10 days of working in the shop.

With a couple of exceptions, you can turn the unit on or off, control the fan speed, and even set a timer that turns it off automatically via a panel on the unit, or by remote control. The Grizzly G provides the functions on its remote control only. The Supermax has a gauge that indicates when the filters become too clogged to clean the air effectively.

No other units have this feature. Filter upgrades can save an air cleaner Curious to see if an upgraded filter would improve performance on these air cleaners, we tested two units with aftermarket prefilters MERV 7 and high-efficiency pocket filters MERV 15 from American Fabric Filter , americanfabricfilter. However, the Grizzly G improved vastly from minutes using its original filters to just 33 minutes with the AFF filters.

First, the Jet AFS proved best overall with the top airflow, fast filtration, and the largest filters fewer cleanings. But its large size could make it unrealistic in some shops, particularly those with a low ceiling. Our Top Value: the box fan. Get one rated at MERV 10 at a minimum. A filter rated higher than MERV 12 will increase dust pickup, but likely lessen airflow. Download Dust Filters Comparison Chart. Replacement Parts. Mortisers Grinders Scroll Saws Accessories. Stay Connected Be the first to know about new products, events and special offers.

Roll over Image to Zoom. Stock No. Contact An Expert. Description The powerful AFS is perfect for the serious woodworker. Features Adjustable Exhaust directs the air where you want it for optimal circulation Disposable Electrostatic Outer Filter attracts more dust particles than standard filters Electrostatic Outer Filter Four Eye Bolts let you hang unit from shop ceiling; all hardware included.

Fully-Enclosed Ball Bearing Motor with Overload Protection for long, dependable service Inner Pocket Filter is removable for easy cleaning Remote Control has built-in timer with 2, 4 and 8-hour settings; automatically shuts system off at the end of the time setting Rubber feet prevent marring of surface when placed on workbench Three-Filter System with Air Diffuser disperses outgoing air into a broader pattern.

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