The National Ventilation 494 is an in-line backdraught shutter designed for 100mm (4 inch) round p...The National Ventilation 494 is an in-line backdraught shutter designed for 100mm (4 inch) round pipe ducting. It serves as a straight pipe connector with a back draught damper, ensuring efficient airflow control. This component is colored white for a discreet integration into ventilation systems.
2 x National Ventilation 494 In-Line Backdraught Shutter for 100mm / 4 Inch DuctFree delivery in 1–3 days£14.00Visit shop →
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The National Ventilation 494 is an in-line backdraught shutter designed for 100mm (4 inch) round pipe ducting. It serves as a straight pipe connector with a back draught damper, ensuring efficient airflow control. This component is colored white for a discreet integration into ventilation systems.