From the Manufacturer
The PSI Woodworking TSGUARD Table Saw Dust Collection Guard is the ideal solution for table saw safety and dust control. When connected to a dust collection system, the PSI Dust Collection Guard captures the dust thrown up by your table saw blade. The Guard can be used on any table saw with an extension table. It is very easy to install and easily swings out of the way. A unique counter-balance allows for fast and easy positioning.