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30 x 9mm ( 3/8 inch )30 x 13mm ( 1/2 inch )24 x 19mm ( 3/4 inch )24 x 25mm ( 1 inch )12 x 32mm ( 1 1/4 inch ) Measurement is the tool hole size
Terracottta Castellated Roof Tile Vent and Adapter
Overall vent size: 9½" x 6½" (240mm x 165mm)
24" x 3" (610mm x 76mm)
with the rebated unit allowing adequate clearance for any extended guttering
Manthorpe Grey Interlocking Air Brick Vents Pack Size:10 30 x 9mm ( 3/8Product Description Manthorpe Grey 9" x 3" Air Brick Vents Plastic interlocking air brick ventilator. Part number: G930. Provides 6,450mm of airflow per 9" x 3" airbrick. Clip together facility provides a choice of ventilation sizes. Can be stacked together to create 9" x 6" and 9" x 9" combinations. Additional G935 extension sleeves available in . Moulded in mortar key ensures secure adhesion to the building fabric. Meets NHBC requirements for the