The National Air Filtration Association will hold its technical training seminar May 12-15 in Phoenix. The topics for the dual-track program - for both new and experienced air filtration personnel, mechanical engineers, technicians and facility managers - include all aspects of air filtration and new technologies being introduced. A pre-seminar titled, “Testing the Indoor Environment - Needed Knowledge for our Changing Industry,” will be held at Aerotech Laboratories on May 12.