chimney cap
plural of underload switch
A unit of flow in terms of volume per unit time. It is not a standard unit but varies by location.
A device to improve the draught of a chimney, by presenting an exit aperture always to leeward.
plural of microeconomy
昨秋、煙突の通気を改善するために出口を常に風下に向けるタイプの煙突キャップを取り付けました。
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