Pressure relief valve use for pressure balance between inside and outside of cold rooms. The worm air comes in during
the door opening and closing or defrosting period, this situation leads to the pressure balance. The pressure relief valves
are use to protect panels, doors and other components against the air pressure. The valves produced with highly durable
plastic materials and suitable to use up to -40 celsius. The klepes protect against to freeze problems with electrical heaters.