(4") 100mm dia White Metal Air Valves complete with Galvanised Neck Spigot

The EFF is an exhaust diffuser for installation in ceilings or walls. It can also be used for supply air. The diffuser has a lockable central cone which is rotated to adjust the pressure and consequently the air volume. Being a metal item this is also suitable for general ventilation or were heat is involved.

**100mm is the neck diameter for connecting the ducting too**

**Overall Flange is 138mm**