John A. Constance, PE, is principal engineer with The Engineers Collaborative (www.engcollab.com) specializing in engineering and designing dust and vapor capture systems. He has more than 30 years experience designing and troubleshooting these systems for bulk solids processing and handling industries, including general chemicals, pharmaceuticals, cosmetics, electronics and foods. John holds a BS in mechanical engineering and an MS in business management from Stevens Institute of Technology, Hoboken, N.J. John can be contacted at 215-300-9563 or by email at jac@engcollab.com.