Fixtures & Water Heaters第 73 / 120 题
Where an enclosure takes combustion air from an adjacent room through two permanent openings, where must those openings be located?
a.Both within 12 inches of the ceiling of the enclosure
b.Both within 12 inches of the floor of the enclosure
c.One at the ceiling and one at any convenient height on an outside wall
d.One within 12 inches of the top of the enclosure and one within 12 inches of the bottom
解析
The two-opening method requires one opening within 12 inches of the top and one within 12 inches of the bottom of the enclosure so that heated air can exhaust high while replacement air enters low. Placing both openings high or both low defeats the convective loop that drives the air exchange. Locating the lower opening at any convenient height does not satisfy the 12 inch dimension.
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