Outdoor Boiler Stack Height Above Roof

Minimum stack height requirements for outdoor wood burners owb s.

Outdoor boiler stack height above roof.

Provide ample stack height a minimum of 10 ft above adjacent rooflines or air intakes. For the next example you have a shorter chimney height. Provide a stack velocity of a minimum of 1 4 times the wind velocity. For gas vents or a type l vent this distance above the roof surface must be at least 2 ft 0 61m.

Place the stack as far from the intake as possible 50 ft is recommended. Place stack downwind of air intakes. Owb s should be utilized only in rural settings. Place the stack at least 10 ft high on most roofs to avoid recirculation.

For 18 feet of run you would have a rise of 72 inches. Vertical blue line along the left side of the chimney in our photo. This started out as a question but found my own answer. It s 6 inches in many states but especially in northern states like minnesota it s 12 inches.

Requiring a stack height of x feet above any structure within a 50 to 200 radius creates a very real liability issue. All parties involved should become very aware of the liabilities and consequences of such regulation. If a new owb is subject to a valid nuisance complaint the dec may require that the permanent stack extend up to two feet above the peak of any roof structure within 150 feet of the owb click here for more info. Ipc 904 1 does not give a minimum height for stack vent termination above a roof it just says at least number inches mm the minimum termination height for a plumbing stack vent varies by state.

If the previous calculation results in the required height of 64 inches we can see that the top of the pipe will not rise above the roof peak but would still meet the requirements of the rule.