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Here is my air filtration unit.  It is a shop made unit based on plans from several magazines (American Woodworker #80, Wood #120).  Many people have asked for the plans to this unit and while I would like to give them to everyone, I really do not have any.  I did draw up and scan some rough drawings for anyone who is interested in building one.  You may have to adapt them to your particular blower. 

For mine, I was able to pick-up a used blower from a local HVAC shop for free.  It is a three speed, 1100 CFM blower and will move alot of air in the shop.  I built a plywood box and added three filters to it.  The first is a 50 cent furnace filter followed by a pleated furnace filter (~$4.00), both from Lowes.  The third filter is a replacement bag filter for the JDS brand unit (~$32.00).  With a three speed switch and 2 hour timer the total came in around $50 not counting the plywood I had on hand.  It works great!
Dust Collection
My cyclone central dust collection system.  This is the cyclone from the Wood Magazine plans.  I used the recommended Penn State blower and get plenty of suction at each tool.  It was fun to build and I would recommend anyone give it a try if they are considering a central dust collection unit.  I recently vented the blower out the window because I was tired of cleaning the filter unit.  I have installed a CO detector next to the gas furnace and hot water heater to detect any backdraft from the air lost in the shop. 
Here is my air filtration unit.  It is a shop made unit based on plans from several magazines (American Woodworker #80, Wood #120).  Many people have asked for the plans to this unit and while I would like to give them to everyone, I really do not have any.  I did draw up and scan some rough drawings for anyone who is interested in building one.  You may have to adapt them to your particular blower. 

For mine, I was able to pick-up a used blower from a local HVAC shop for free.  It is a three speed, 1100 CFM blower and will move alot of air in the shop.  I built a plywood box and added three filters to it.  The first is a 50 cent furnace filter followed by a pleated furnace filter (~$4.00), both from Lowes.  The third filter is a replacement bag filter for the JDS brand unit (~$32.00).  With a three speed switch and 2 hour timer the total came in around $50 not counting the plywood I had on hand.  It works great!
What shop is complete without a shopvac!