Mg Duravent FSWTI04 Insulated Wall Thimble 4 Inch

Product Description

The MG DURAVENT FSWTI04 is a 4-inch insulated wall thimble designed to provide a safe, code-compliant penetration point where a flue or vent pipe passes through a combustible wall assembly. The thimble maintains required clearances between the vent pipe and surrounding framing materials, reducing heat transfer and fire risk. It is a standard component in solid-fuel, wood-burning, and certain gas venting installations where the vent run must exit through an exterior or interior combustible wall. HVAC technicians and chimney professionals install this fitting during new construction and retrofit venting projects.

The FSWTI04 is suited for residential and light commercial venting applications where a 4-inch vent pipe must transition through a wall. It is used in conjunction with compatible single-wall or double-wall vent pipe systems to complete a properly insulated and protected wall pass-through. Typical installations include wood stoves, fireplaces, and other appliances that require a dedicated venting pathway routed horizontally through an exterior wall.

Key Features

• Insulated construction maintains clearance to combustibles at the wall penetration
• Sized for 4-inch vent pipe diameter
• Designed for use in combustible wall assemblies
• Supports code-compliant horizontal vent routing through exterior or interior walls
• Compatible with standard 4-inch venting system components

Compatibility

Designed as an OEM-style replacement or new-installation component for 4-inch insulated venting systems used with wood-burning and solid-fuel appliances requiring a wall thimble penetration fitting.

Installation Notes

Installation should be performed by a qualified HVAC technician or chimney professional in accordance with local building codes and the appliance manufacturer's instructions. Ensure the appliance is fully shut down and cooled before beginning any work on the venting system. The wall opening must be sized and framed to the clearances specified by the vent system manufacturer and applicable codes. Do not compress or bypass the insulated thimble assembly, as doing so reduces required clearances to combustible materials.

Technical Specifications

• Pipe Diameter: 4 inches
• Insulation: Insulated
• Application: Wall thimble penetration for combustible wall assemblies

Standard Information

• Brand: MG DURAVENT
• Manufacturer Part Number: FSWTI04