Tony make sure the motor is "continuous duty" rated. I use the 3 hp impeller section from an extra blue tornado cyclone system I had. I bring a 6" pipe down to the laser and split it with a 4" Y with blast gates on both 4" inlets. One feeds the back exhaust and the other comes from underneath so I can have a vacuum table also. I can adjust the amount of CFM with the blast gates. Works great and I do direct vent into a ceiling mounted vent in a commercial tilt wall building. You may find a good deal on a dented or used cyclone system and just use the impeller portion to get your air extraction.
Have a Blessed day,
Michael Kowalczyk
Laser-Trotec Speedy II 60 watt with 9.4.2 job control and will soon upgrade to JC X
Corel Draw Suite X6, FlexiSign Pro 8.62, AI CS3 and Lasertype6
CNC Routers-Thermwood model C40 with 4th axis. Thermwood Model 42 with dual tables and dual spindles with ATC for high production runs,
ArtcamPro 2010_SP4, EnroutePro 5.1, BobCad v21 & v24, Aspire v8 and Rhino 5.
FOTC link
http://www.sawmillcreek.org/friends.php?cp=210&lp=0&t=0&q=