Flap valve wood 150x150

Flap valve for wall mounting. Designed for square telescopic duct. The cover is hinged at the bottom, forcing the fresh air up below the ceiling and reducing the risk of cold draughts. Fits internal part of telescopic duct, 6”x6”. The cover and frame are made of polished, untreated pine. Storage in sunlight can cause colour change. Can be painted. Suitable for installation in saunas.