A residence of ordinary tightness gets all or part of its combustion air to supply its appliances by infiltration. How many cubic feet per 1000 BTUH are required to supply each appliance in the building?
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windy city oil field, karamay, xinjiang, China
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Laying plastic pipes drainage to drain the water around the house of drainage system
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Concrete cube or construction brick and trowel. Construction concept and mason
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Joyful young man construction worker holding mobile phone and smiling while standing by the table with laptop
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