{"product_id":"638-105","title":"638-105","description":"This 4\" to 5\" B-Vent Increaser is a critical component for optimizing exhaust flow in gas-fired heating systems. Designed to transition seamlessly from a 4-inch diameter vent pipe to a larger 5-inch diameter system, this adapter ensures proper drafting and safety for residential and commercial HVAC applications. Engineered for use with Type B gas vents, it is ideal for connecting appliances like water heaters, furnaces, and boilers to a larger common vent or chimney liner. The double-wall construction provides excellent thermal insulation, protecting surrounding combustible materials while maintaining high internal temperatures for efficient exhaust removal. Whether you are performing a new installation or upgrading an existing ventilation system, this durable metal increaser provides a secure, leak-resistant fit.\u003cbr\u003e\nType: Metal Venting \/ B-Vent Adapter\u003cbr\u003e\nSize: 4 inch to 5 inch\u003cbr\u003e\nDimensions: Standard B-vent fitting length × 5-inch outer diameter × 4-inch inner diameter inlet\u003cbr\u003e\nApplication: Used in gas-fired appliance exhaust systems including furnaces, boilers, and residential water heaters. Specifically designed for Type B double-wall gravity-vented systems.\u003cbr\u003e\nSpecifications: Double-wall construction, corrosion-resistant galvanized steel or aluminum outer casing, secure locking transition from 4-inch pipe to 5-inch pipe.","brand":"BCFurnace","offers":[{"title":"4\" TO 5\" B-VENT INCEASER \/ 638-105","offer_id":49018449363229,"sku":null,"price":36.96,"currency_code":"CAD","in_stock":true},{"title":"4\" TO 5\" B-VENT INCEASER \/ 200458","offer_id":49018449395997,"sku":null,"price":36.96,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0836\/7298\/9981\/files\/277146026e594165a53a408764bdf5eb.webp?v=1773957617","url":"https:\/\/bcfurnace.myshopify.com\/products\/638-105","provider":"BCFurnace","version":"1.0","type":"link"}