Recommended primary filters for comfort and non-critical industrial applications. They can be installed directly in building Air Handling Units (AHU) or mounted onto filter banks. Superior quality non-woven synthetic filter media sandwiched between two layers of HDPE mesh which acts as a retainer and eliminates larger particles, thus, preventing them from sticking to the media. The pleating of the media enhances the filtration area for better efficiency. To eliminate the possibility of even a small amount of dirty air bypass, the media pack is securely bonded to the periphery of the enclosure frame using epoxy hardener.