Dear All,
We intend to design and build a clean air system for transformer fabrication facility. The customer requirement is dust free air with controlled moisture. Fresh air will be continuously pushed into the facility with the help of centrifugal blowers and vented out from gravity controlled louvered configured to maintain a 0.5kpa difference between atmospheric and indoor pressure. The ventilation type is positive displacement.

Filtration will be two stage using pre-filter and HEPA filter.

I would like to have your input in regards to selection of MERV / HEPA filters and the general system design over all as we are taking such job first time. We do have experience in fabricating small units for hospital use however this job is the biggest ever in our scope. Definitely we cannot use medical grade HEPA filters here because they run into thousand bucks per filter.

Every filter maker makes tall claim of 96-97% efficiency but real life experience will tell the actual capability.

The fabrication will be stainless steel and centrifugal blowers will be Ebm-Papst EC-Plug product line.