Design

Air Admittance Valves

Air admittance valves
  • Designed to reduce the number of ventilating pipes which pass through the roof
  • Valves can be installed in a ventilated duct or the roof space
  • Conventional ventilation is required if more than 5 dwellings are equipped with a valve
  • The valve must not be at risk of freezing and therefore should not be fitted externally. It should also be accessible for inspection and testing.
  • Must be fitted above the flood level of the highest appliance.