The Expert Guide to Thru The Wall Stove Pipe Installs

Installing a stove pipe through an exterior wall, known as a "thru the wall" venting system, can be a great alternative to venting through the roof. This type of installation allows more flexibility in stove placement without having to penetrate the roof. However, thru the wall systems require specialized components and careful planning to ensure safety and efficiency. This comprehensive guide will walk you through everything you need to know to successfully plan and execute a thru the wall stove pipe installation.

How Thru The Wall Stove Pipe Kits Work

Thru the wall stove pipe kits contain all the unique components needed to vent a wood or pellet stove horizontally through an exterior wall instead of vertically through the ceiling and roof. Here are the key components included in a typical thru the wall venting kit:

Wall Thimble

A wall thimble is a metal sleeve that gets mounted into the wall framing as a transition piece between the interior and exterior. It maintains proper clearances to combustibles and allows the stove pipe to safely pass through the exterior wall without risk of fire. Wall thimbles are typically available in various sizes to accommodate different pipe diameters. They should be constructed of stainless steel or galvanized steel for durability.

Stove Pipe Adapter

The stove pipe adapter connects the stove pipe to the wall thimble. It is usually a smaller diameter piece that increases to the size of the thimble's interior opening. Adapters are cylindrical or square shaped based on your pipe requirements. Durability is important as this adapter sees high exhaust temperatures. Look for sturdy construction in stainless steel or cast iron.

Cleanout Tee & Cap

A tee with a cleanout cap is installed along the pipe run to allow easy access for inspection and cleaning. This is an essential component for proper maintenance. The cleanouts allow you to snake a chimney brush through the entire pipe to remove dangerous creosote buildup. Choose a heavy duty cleanout cap that seals tightly.

Wall Supports & Brackets

Wall supports and brackets provide structural integrity where the pipe passes through the wall. The base wall support carries the weight of the vertical pipe section. Wall brackets then stabilize the horizontal pipe run. These components are subject to high temperatures, so look for sturdy construction in cast iron, stainless steel or powder coated steel. Properly installed supports prevent sagging pipes.

Installation Steps

With the right thru wall kit, you can tackle a stove pipe wall pass through installation as a DIY project. Follow these key steps for proper installation:

Selecting the Installation Location

The ideal installation location depends on multiple factors like stove placement, wall framing, and exterior vent termination requirements. Consider the following when choosing your thru wall location:

• Shortest possible horizontal stove pipe run
• Clear path through wall stud framing
• Meets clearance requirements above doors, windows, and vents
• Allows for proper vertical rise on exterior
• Accommodates wall thimble size

Cutting the Necessary Wall Openings

Once you determine the optimal height for the thru wall installation, use the specified wall thimble size to mark and cut an opening through the wall's interior sheathing and exterior siding or bricks. Use extreme caution when cutting the opening with a circular saw or hole cutting tool. Brace wall studs as needed before cutting to prevent structural issues.

Installing the Wall Thimble & Supports

With openings cut, you can install the wall thimble into the interior wall framing so that it is flush with the inside sheathing. Use non-combustible insulation around the thimble to maintain proper clearances. Next, secure the base wall support below the thimble on the interior side with specified fasteners. Finally, install the exterior pipe section into the thimble and lock it in place with the included exterior wall trim collar.

Connecting the Stove Pipe Sections

Once the main wall pass-through components are installed, connect your black stove pipe sections. Use adjustable length pipes, elbows, and cleanout tees to construct your horizontal pipe run from the appliance to the wall. Maintain a 1/4" rise per foot of horizontal pipe using elbow angles. Lock all connections together securely. A shorter venting system experiences less friction and turbulence.

Completing the Exterior Vent Termination

On the exterior side, install wall brackets to support the vertical pipe rise. Terminate the system at the appropriate height with an adjustable chimney cap that includes screens. A spark arrestor screen prevents embers from escaping. Follow local building code requirements for the exterior pipe height based on proximity to the roofline and windows.

Maintaining Your Thru Wall System

While a professionally installed thru wall stove venting system requires less maintenance than traditional chimneys, regular care is still essential. Follow these tips to keep your system operating safely for years to come:

• Inspect pipe sections regularly for corrosion
• Check for creosote buildup and clear with chimney sweeps as needed
• Remove and clean the cap to prevent any blockages
• Watch for leaks indicating damaged pipe sections
• Repair any damaged thimble, supports, or brackets immediately

Safety Tips

In addition to proper maintenance, keeping safety top of mind is critical with any stove pipe installation but especially thru wall systems:

• Use only stove pipe components intended for your specific appliance
• Follow all manufacturer instructions carefully
• Consult your local building department about permits and code requirements before installing
• Maintain minimum clearance requirements between pipe and combustibles
• Install smoke and carbon monoxide detectors for added protection
• Consider adding heat shields and insulating thimble exterior

Although it requires specialized components and proper technique, a thru the wall installation can be an excellent alternative to conventional vertical stove venting for many homeowners. If done correctly following the steps outlined in this guide, you can achieve increased safety, efficiency, and performance compared to old-fashioned roof venting. Just be sure to do your research, consult local building codes, and hire a professional if you have any doubts before cutting into your exterior wall. With the right thru wall stove pipe kit and this comprehensive installation guide, you can confidently tackle this type of unique venting project.