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FAQ - Vertical or Horizontal Venting Pipes

Vertical Or Horizontal?

Why Direction Matters

When planning the physical run of your vent pipe through your home, there are a few factors that you should keep in mind to help ensure the best system.

Appliance requirements:

Try and minimize the number of turns or bends in your installation. The more you restrict the flow of your system the less draft you will get. (See the full article on Draft problems here.)

Code/Safety and Cost:

Although the situations vary greatly, it could be more costly to go vertically through your ceiling/attic/roof versus through your wall and then up. Examples of some restrictions you might face in each installation are listed below.


Additional Construction: If pipe passes through a second floor or accessible room, product must be enclosed within a wood-framed chase with minimum clearance.

Roof Clearance: I you have a steeply pitched roof, you might want to position your stove to be as close to the peak as possible. If you are far away, you might have to purchase additional footage to meet minimum clearance requirements.

  • *This is commonly know as the 10 Ft/2 Ft Rule
  • *For additional information on components required for your installation please view the complete article here.

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Is Horizontal termination possible?

In most cases it is not possible to terminate horizontally. Most termination caps require clearance in feet, not inches. Because of this, you normally are required to turn vertically after penetrating your wall, for a vertical termination.

However, there are two exceptions to this rule:


Because of the unique design of this type of flue, it has very low clearance.

The chimney cap is zero-clearance due to a built-in heat shield

This product may terminate horizontally.


Most pellet stoves produce low temperature exhaust, so the clearance to combustible materials is minimal.

The cap must be 12 inches off the ground

The cap must be 6 inches away from the wall

This product may terminate horizontally

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Dealing with Obstructions

After planning your pipe installation, you might have come to realize that there is absolutely no way to bypass an obstruction. Depending on your situation it might be worth it to relocate the stove due to flow restrictions, however most can be bypassed safely and easily.

Step 1:

The first thing you will need to know is exactly how far you need to move over. When taking this measurement, remember to take into consideration your clearance.

Step 2:

Select your how steep angle of an elbow you need (15°/30°/45°). After you have established how far you need to move your system, reference the offset table.

Step 3:

Bypass your obstruction, and make sure to support the section of pipe between your pair of elbows.

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