The glass fibre panel filters are disposable and offer a basic level of filtration or pre-filtration in HEVAC applications. These glass fibre filters are constructed by bonding a pad of glass fibre media into a water repellent beverage board frame. The frame has superior tear resistance when wet, and excellent dry tear resistance and is manufactured from renewable sources. The glass fibre filter media is made from recycled products and has a graduated density to provide a great depth loading of filtered particles. This filter media is tackified (made more tacky) to provide improved efficiency and is very inexpensive. 20x20x2"