Twin Wall Ventilated Fire Stop (641) - 180mm Dia Zoom Twin Wall Ventilated Fire Stop (641) - 180mm Dia SKU: 030918641DW. The ventilated firestop must be used on solid fuel appliances. The stainless steel plate designed to provide appropriate distance between the flue and the adjacent materials, according to both fire and building regulations Availability: In stock £85.99 Qty: Add to Cart Email to a Friend Additional Information Additional Information Additional Information SKU 030918641DW Diameter 180mm (7") Components Firestops CMS tab x Add to Cart Price: Actual Price: Our price is lower than the manufacturer's "minimum advertised price." As a result, we cannot show you the price in catalog or the product page. You have no obligation to purchase the product once you know the price. You can simply remove the item from your cart. Our price is lower than the manufacturer's "minimum advertised price." As a result, we cannot show you the price in catalog or the product page. You have no obligation to purchase the product once you know the price. You can simply remove the item from your cart.