Yeah Harbor Freight sells Gerson which is NIOSH approved, no problems there. Check it out http://www.gersonco.com/Categories/Cartridge-Respirators.aspx
This is the unit that Harbor Freight sells.

Last edited by sstock; 02/10/2014 1:19 AM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration