Looking for comments on different methods used in petroleum labs for ventilation systems. Especially over gas Chromatagraphs, and mass specs. Used for hydrocarbon analysis. ?
Check out the following publication by the American Conference of Governmental Industrial Hygienists (ACGIH):
"Industrial Ventilation: A Manual of Recommended Practice"
I believe that they are up to the 25th edition now, but any of the previous editions will suit you fine. The book is chock full of useful information on the design, operation & maintenance of industrial exhaust ventilation systems. The volume includes numerous tables, diagrams and design drawings.