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Ubbink's UB17 slate space vent is a roof void ventilator for use in slates. The base as supplied is a direct replacement for a 600mm x 300mm slate. When the 25mm side bands are trimmed off and the inner set of fixing points is used, the unit is then a direct replacement for a 500mm x 250mm slate.
The UB17 unit has a free vent area of 10,000mm².
To convert this unit to a terminal please add a UB17 adaptor