Butterfly valve, has a round cross-section of the passage channel, designed to block the chimney of fireplaces. If it is impossible to buy such a damper, use two oven views installed side by side. As an option, a home-made oven view from a wide sheet of tin 1-2 mm thick is used. Tin is pressed into the masonry along with the guides, after drying, the masonry is carefully developed, to reach full working, but without excessive play. Available diameters from 152 up to 230mm.
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