? Retro-fitted combustion air vent for boilers, stoves and fires. ? Tube contains a light and draught reducing system of baffles. ? Unique draught reducing internal panel disperses air evenly into the room for improved comfort. ? Paint or wallpaper the internal panel to match room d?cor for a discreet appearance. ? External water baffle prevents transfer of water across the cavity. ? Interlocking components aid correct positioning, alignment and easy installation. ? Grilles embossed with DO NOT BLOCK. ? External grille U.V. stabilised to slow down the effects of sunlight. ? Screws provided to secure the internal panel. ? HETAS approved for use with solid fuel appliances. ? Verifiable equivalent area confirmed by the BRE.