S.H.L. Anti Down Draught Cowl S.S autumn sale 2025 diy decor Dulux High Gloss is a Dulux High Gloss is a solvent based finish suitable for the protection and decoration of most interior and exterior surfaces where a durable high gloss finish is required It is effective against early immature The Static anti down draught chimney cowl shields the chimney from light wind air currents coming from any direction preventing down draught causing smoke to escape from an open fireplace or stove Balances the performance of the chimney through the Venturi Effect and this chimney cowl is especially suited to stove installations as it will aid the draught or upwards movement of gases in the chimney