Supply Scope Supply of Forster Presto and Forster Thermfix Vario to Qatar Petroleum. Forster presto is the complete profile system with fittings and accessories for flush- fitting single- and double-leaved doors, glazed walls, porches and windows which do not require thermal break. These elements stand for elegance and safety and satisfy the most stringent requirements with regard to extreme constant use . The system forster thermfix vario is a thermal insulated mullion and transom construction, based around a dry glazing security application system for fire, burglar and bullet protection