A medium grade general application air filter in grades ranging from EU4/G4 to EU8/F8. Like glass fibre or synthetic panels, ‘Vee-pleat’ panel filters can be used on their own for a wide range of general heating, ventilation and air conditioning applications, or as a pre-filter to higher efficiency filtration. Ideal where greater airflow or higher efficiency is required, or where even minimal fibre migration is unacceptable.