Ubbink's UB11 (380mm x 285mm) is an in-line unit with a multipurpose base which will provide inconspicuous ventilation in natural and manmade slate roofs. Can be installed with either 500mm x 250mm or 600mm x 300mm slate vents.
Ubbink's Vepac (382mm x 398mm) is an in-line unit which should not need trimming when installing with 600mm x 300mm slates.
Vepac vents are suitable for high or low level ventilation in roofs of 25° and over. Each vent has a slotted inhibitor to keep out large insects and vermin and provides a free vent area of 10,750mm².