How to Install a Simpson Dura-Vent Corn Stove Wall Thimble

A protected wall penetration is essential for all types of stove piping.

Corn-burning stoves are efficient heating appliances that can be somewhat easier to install than traditional wood-burning stoves. Nonetheless, adherence to safety requirements for venting is essential. For corn and all other stoves, a wall thimble is a vital accessory for side-wall venting. The Simpson Dura-Vent PelletVent Pro wall thimble, which is compatible with pellet and corn stoves, provides the essential 1-inch clearance from combustibles that is required for such configurations. Whenever you are installing stove piping, it is important to consider local building codes as well as the manufacturer's instructions. If you're ever unsure about a step during installation, contact a professional or the manufacturer for advice.

Things You'll Need

• Measuring tape
• Drill
• Jigsaw
• Silicon sealant

Instructions

1. Cut a square opening in your wall based on the dimensions of the Dura-Vent wall thimble you're installing. Trace around the square frame of the thimble to guide your cut. Drill a starter hole with a drill and use a jigsaw to cut the square hole.

2. Secure the black half of the thimble onto the interior wall, and place the unpainted half on the exterior wall.

3. Adjust the length of the pipe sleeve based on the thickness of your walls. The PelletVent Pro thimble adjusts between 4 and 8 inches thick. You may need an additional extension tube if your walls are thicker than this.

4. Apply silicon sealant around the edges of the thimble where it meets the wall.

5. Connect pipe sections to the back of the stove and run them through the thimble and at least 6 inches past the exterior wall. Install all remaining venting accessories.This includes a cleanout tee, wall straps and a horizontal cap.

Tips & Warnings

• Corn stoves require the installation of a round horizontal cap. When planning the configuration of the venting, consider the requirements set by the National Fire Protection Association. The exit should be at least 3 feet above forced air inlets and 4 feet away from doors and windows. Maintain a clearance of at least 2 inches between the vertical piping and combustible exterior walls.

• Always use stove pipe sections that match the flue collar of your stove, which is likely either 3 or 4 inches in diameter. Do not connect the stove to a chimney with a small flue size. This could result in a backdraft of smoke, debris and gases into your home.

• Do not allow pipes to run downward for venting. Ensure a 1/4-inch rise for each foot of pipe, particularly for horizontal terminations.