Metal-Fab 4″x18″ Oval B-Vent Pipe Double Wall HVAC Flue Duct LP Nat Gas

Overview

Metal-Fab 4" x 18" Type B Oval Gas Vent Pipe – Double Wall LP/Natural Gas FlueThis Metal-Fab MFG# 4M018 Type B Oval Vent Pipe is designed for the safe venting of Category I appliances burning LP (propane) or natural gas. Commonly used in HVAC systems, this 18-inch pipe features an oval profile that fits tightly between 2" x 4" or 2" x 6" wall studs, making it ideal for compact or in-wall applications.🔧

Key Specifications

• Size: 4" Oval Diameter x 18" Length
• Material: Double-wall – aluminum alloy inner flue, galvanized steel outer casingClearance: Only 1" to combustiblesApplication: Use with gas-burning appliances like furnaces, water heaters, and boilers

Use Case

Compatible with vent components like elbows, caps, and fittings in Metal-Fab’s B-Vent system⚙️

Features

• Space-saving oval shape for stud-wall ventingDual-layer construction for thermal protection and durability
• Designed for use with LP Gas and Natural Gas systems
• Ideal for both residential and light commercial HVAC applicationsUL-listed for safe, compliant installation

Product details

Part / SKU	MFG# 4M018

Package includes

• Metal-Fab 4"x18" Oval B-Vent Pipe Double Wall HVAC Flue Duct LP Nat Gas

Included components and any stated pack quantity are as described in this listing. Optional accessories shown separately are sold separately unless expressly included above.