The chimney extension is primarily used to extend the chimney. The length is decisive for the draft and thus also for the ability to completely discharge smoke gases into the outside air. The length of the chimney means that the negative pressure is created and thus the exhaust gases are practically sucked outwards. If this negative pressure is not strong enough, your chimney is too short. 3-2-10 Rule Explained This rule refers to the proper height of the chimney pipe above the roof. Explained, the chimney pipe must be a minimum of three feet above the roof but also two feet taller than anything within ten feet. Minimum three feet above the high side of the roof At least two feet taller than anything within ten feet The portion of the rule stating the pipe needs to be 2 feet above anything within 10 feet is where most people get confused. Most people think of that in terms of trees, satellites, or other parts of the home, which are all accurate, but neglect to consider the roof itself. The higher the roof pitch is, the closer the roof will be to the pipe where it penetrates the roof. This doesn't necessarily mean the pipe must be above the tallest part of the roof, which is known as the ridge. But, the pipe will require a 10' horizontal clearance from the roof. Easy Calculation for Chimney Pipe Height Knowing the pitch of the roof is extremely helpful in determining the height the chimney pipe must be above the roof. Roof pitch explained simply is rise over run. The 'rise' is the vertical rise of the roof over the 'run' which is the horizontal distance. In the construction world, the run is defined as 12 which is 12" of horizontal run. So, the roof pitch is determined by how many inches the roof rises to the peak over 12" in horizontal length. Next, we need to know if the penetration in the roof will be within ten feet horizontal distance of the ridge. If you are further than 10' horizontal distance from the ridge, we will use a multiplier of 10 feet since this requirement is covered. Anything closer than 10', you will use that measurement as the multiplier. Once we know our roof pitch and our distance from the ridge, it is now very easy to determine the chimney height by doing a little math. Suitable for all Buschbeck barbeque fireplaces. 36" Chimney extension will give you 28" over the concrete chimney. 72" Chimney extension will give you 62" over the concrete chimney. Dimensions: 4" x 36"+36"
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