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Figure 6.1: Boiler Installed In A Confi ned Space, Ventilation Air From Inside
Step 2a (contd.)
If the total volume of both the boiler room and the room to which the openings connect is less than •
50 cubic feet per 1000 BTU/hr of total appliance input, install a pair of identical openings into a third
room. Connect additional rooms with openings until the total volume of all rooms is at least 50 cubic
feet per 1000 BTU/hr of input.
The “free area” of an opening takes into account the blocking effect of mesh, grills, and louvers. •
Where screens are used, they must be no fi ner than ¼” (4 x 4) mesh.
Step 2b: If the boiler is to be placed in an unconfi ned space the natural infi ltration into the boiler room will
provide adequate air for ventilation without additional openings into boiler room.