I'm new to the forum. I work for a blown film extrusion company and we are working towards our SQF certification. My question is what type of air testing would we need to complete? In my opinion we would only need to do ISO 8573-1, but our consultant keeps pushing us towards doing the ISO 8573-7 for microbial testing. Is there anyone out there in the blown film industry that could help me with this topic. I don't believe our compressed air comes in direct contact with food or food contact surfaces.