• Provides 25cm2 free airspace
• 76mm Hole 
• 89 External Diameter

Technical Specification:
Meet the building regulations at 250mm (10) for centres for roof pitches over 15 degrees.
Dia.: 76mm
Free Area cm²: 25
Weight: 25g
Material: PVC
Cut out size: 76mm
Overall Diameter: 88mm
Depth: 23mm