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2mm x 10mm - Qty 100
Manrose Intervent NVF100S
12 x 12mm ( 1/2 inch )12 x 16mm ( 5/ inch )12 x 20mm ( 3/4 inch )12 x 25mm ( 1 inch ) Measurement is the tool hole size
Allows a 2 course per extension
Black Combination Air Brick Vents 9" x 3" for Air Flow Ventilation Corner Wall Protectors 2mm x 10mm - QtyProduct Description Black 9" x 3" Air Brick Vents Plastic interlocking air brick ventilator. Clip together facility provides a choice of ventilation sizes. Can be stacked together to create 9" x 6" and 9" x 9" combinations. Moulded in mortar key ensures secure adhesion to the building fabric. Meets NHBC requirements for the control of condensation in buildings. Manufactured to BS 493: 1995 + A1: 2010. Other colours and ventilation fittings for this
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