The walls of a cold room are constantly subjected to strains caused by pressure variations, either from inside or from outside.

It is heated, mechanically operated valve, with two airtight mobile flaps with a return spring, allowing air flow in either direction.

The wall mounted or ceiling mounted valve has a telescopic cylinder to allow adjustment to suit various wall thicknesses.
The cylinder has two separate compartments with flaps that allow either entrance or exit of air to balance the pressures.
This unit is made from a composite material resistant to cleaning products

It is mounted on the perimeter and completely encapsulated in the valve.
Its continuous power is 8W.
The connection is made outside the cooling chamber with a cable which sticks out of front valve gland.