Wall Thimble for 6" Double Wall Chimney Vent Pipe, 304 Stainless Steel Double Wall Insulated Chimney Pipe Wall Thimble

• 【COMPATIBILITY】: The Wall Thimble Suitable for 6-inch double wall insulated chimney vent pipes; Adjustable to meet the penetration requirements of walls 4.5-9 inches thick, for thicker walls can be solved by on-site production of extension pipe • 【WARNING】：Please follow the instructions of the appliance manufacturer to determine the chimney pipe diameter. If you want to calculate the chimney's outside diameter, add 2 inches to the inside diameter. Do not choose chimneys with a diameter larger than the diameter of the casing to use this product, as it will cause significant trouble • 【PRODUCT FUNCTION】: The Wall Thimble designed for horizontal (through-wall) or flat ceiling installations, It protects the wall as the chimney passes safely through to the outside and provides a finished look to the framed opening • 【DESIGN & MATERIAL】: The diameter of the casing round hole is 8 inches, Made of 430 stainless steel, it has excellent corrosion resistance and can maintain long-term working effect • 【EASY INSTALLATION】: The detachable telescopic pieces are very easy to install. Just embed and fix them on both sides of the wall respectively to complete the entire installation • 【304 VS 201 (stainless steel)】： 201 stainless steel: chromium content is 15-16%, nickel content is 8-9%. 304 stainless steel: chromium content is 17-19%, nickel content is 8-10%. Due to different compositions, the corrosion resistance of 304 stainless steel is superior to that of 201 stainless steel. Because nickel is an element with strong corrosion resistance. The chromium content in 304 stainless steel is also relatively high, which enables it to better resist oxidative corrosion. The carbon content of 304 stainless steel is relatively low, which means that the structural changes of 304 stainless steel are small in high temperature environments, thus making its heat resistance better. Why did P Polerden Wall Thimble choose 304 stainless steel

1. Composition and properties
201 stainless steel: The main components of 201 stainless steel are chromium, nickel, and carbon, with chromium content of 15-16% and nickel content of 8-9%. It also contains small amounts of elements such as sulfur, phosphorus, manganese, etc.
304 stainless steel: The main components of 304 stainless steel are chromium, nickel, and carbon, with chromium content ranging from 17-19% and nickel content ranging from 8-10%. It also contains small amounts of elements such as silicon, manganese, molybdenum, etc.
2. Corrosion resistance
Due to their different compositions, their corrosion resistance also varies. Because 304 stainless steel contains a high content of nickel and chromium, and nickel is an element with strong corrosion resistance, chromium enables it to better resist oxidative corrosion. So, the corrosion resistance of 201 stainless steel is poor.
3. Heat resistance performance
Due to the low carbon content of 304 stainless steel, its structural changes are minimal in high-temperature environments, resulting in better heat resistance.
4. Processing performance
201 stainless steel is more prone to scratches and wear than 304 stainless steel. Therefore, during the processing, 304 stainless steel is more durable.
5. Price
The price of 201 stainless steel is usually lower than that of 304 stainless steel, mainly because the production cost of 201 stainless steel is lower. However, considering the poor corrosion resistance of 201 stainless steel, it may require more maintenance and replacement in long-term use. In contrast, although the price of 304 stainless steel is higher, its cost-effectiveness is higher in the long run due to its better corrosion resistance and longer service life.