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Hi everyone, I would like to know if some of you have this document and if it is worth buying. I have the Federal Standard 209E and all the testing methods (specially the particle counting) are explained. Regards, Vincent

Ok, well thank you Zesti for your answer. It is very clear. The air change rate is just 3 volumes per hour so I won't have to worry about the location of the exhaust grilles. Thanks everybody

Thanks for your quick answer. The room is going to be positively pressurized. I should have said that the airflow is supplied by textile duct diffusers (but I don't know if it changes anything).

Hi everyone, I need your help again. I'm having trouble about locating my exhaust grilles in the room I'm designing the HVAC for. I'm worry about the air stratification because of the temperature differential (ie hot air is lighter than cold air) If the air I'm supplying to the room cools...

Thanks for all of your answers. My choice has been made and I will go for the direct driven fan which has a lot more advantages than the belt-driven one.

Thank you for your answer willard3 I have found out this PDF about belt drive VS direct drive ziehl-abegg.com/us/download-2100.html In this PDF, they listed the advantages of direct drive fans: - No transmission losses -> Less power required - No belt residue -> Elimination of filter - No...

Thanks for your quick reply BlueSandman, I didn't quite understood that part, what do you mean by "drop the efficiency for heat and slip"? Do the paint shops you built had a specific air class? What were their sizes (volume)? How much were the airflows? How big were the ducts (diameter)?

Hello everyone, I found out about that post on this forum: http://www.eng-tips.com/viewthread.cfm?qid=178077&page=65 which also talks about the kind of fans to choose but I didn't find my answer. I'm currently designing an HVAC for a food processing company in a class 100,000 room. I'm talking...