9" x 9" Cowled Ventilation Set with Louvre Vent

HETAS APPROVED 9" x 9" Cowled Ventilation Set with Louvre Vent ~ Provides over 140cm² equivalent area. ~ Equivalent area BRE tested. ~ Cowl and internal baffles reduce light and draughts. ~ Internal fixed open louvre ventilator. ~ U.V. stabilised cowl, air brick and louvre ventilator. Equivalent area = 14572mm²