Deep pleated HEPA filters provide highly efficient air filtration, improving overall Indoor Air Quality in highly contamination sensitive facilities and manufacturing sites. These HEPA filters are capable of processing higher air volume and as a result vastly improving filtration efficiency. In addition, deep pleated HEPA Filters have longer clogging time and higher flow rate than standard folded air filters, therefore offering a lower risk of loss from clogged ducts. Microfine glass media with aluminium corrugated separators is used to form the deep pleat media pack.