Boiler Stack Height Above Roof

The height of the stack or chimney is determined by several factors including.

Boiler stack height above roof. Further guidance on gep stack height may be found in the us epa document guideline for determination of good engineering practice stack height technical support document for the stack height regulations revised june 1985 epa 450 4 80 023r. Back to our example over a run of 10 feet the roof would rise 40 inches. To determine the length of brace measure from support bracket assembly to point on roof where brace will be anchored. With the permission of the canadian standards association figure 1 is reproduced from ansi z212 13 2000 csa 4 9 2000 which is copyrighted by canadian standards association 178 rexdale blvd toronto on m9w 1r3 www csa ca.

Stack height should be 10 ft higher than any roof line or air intake located within 50 ft of the stack figure iii 3 8. Reducing stack height. This is a bit of an odd measurement and chimney clearance case because the chimney side is actually about 8 away from the roof edge. 2 feet minimum of 100 feet chimney height installation scenario outdoor wood furnace best burn practices 1 1.

If the chimney extends more than 5 feet above the roof it will require additional bracing. Height of the nearest building or roof line. The primary purpose of a stack or chimney though is to exhaust the products of combustion at some elevation above the boiler which aids the environmental conditions in the immediate area around the boiler. Additionally per our rule we need to add 2 feet or 24 inches giving us a total height of 64 inches.

Only those listed fuels recommended by the manufacturer of your unit. We suggest using a roof brace kit or a field fabricated assembly using a support bracket assembly as shown in figure 15. The height of the chimney above the roof surface measured at the up slope side of the chimney from the roof surface to the chimney top should be at least three feet the green line in our photo. Discharge the exhaust at a height that is above the re circulation region or bubble that forms over the roof.

It is essential to understand what the vent category means in order to select correct venting materials and properly terminate the flue. National fire protection association nfpa standard 45 specifies a minimum stack height of 10 ft to protect rooftop work ers. For example a stack placed 30 ft away from an air intake should be at least 10 ft higher than the center of the intake. Standard z9 5 recommends a minimum stack height of 10 ft above the adjacent roof line an exhaust velocity v e of 3000 fpm and a stack height extending one stack diameter above any architectural screen.

Read and follow all operating instructions supplied by the manufacturer.