9" x 9" Ventilation Set with Flush Louvre

HETAS APPROVED 9" x 9" Ventilation Set with Flush Louvre ~ Provides over 160cm² equivalent area. ~ Equivalent area BRE tested. ~ Internal baffles reduce draughts. ~ Internal fixed open louvre ventilator. ~ U.V. stabilised air brick and louvre ventilator. Equivalent area = 16580mm²