OVERPRESSURE FILTRATION SYSTEMS Home Ventilation Activated Carbon Air Filter P3 Filter Home Welcome to BMAir France. On this page you will find a brief description of how an overpressure filtration system works.. For a general explanation of this product you can watch the movie below which explains how it works . SFS Genera l Combifilters Product Regulations Application Dust filter Charcoal filter acti f Contact Video on the operation of the overpressure filtration system This video, specially produced by Trans Elektro, concerning the application and operation of overpressure filtration systems, explains the importance of such a system, CE certified. Watch the movie ! If you have any questions, consult the OFP or contact BMAir using the contact form.For a short version , see here. .