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air return /ˈeə ɹɪtˈɜːn/ n

中文：回风管

中文 · 回风管Español · recuperación de aireFrançais · reprise d’air
Meaning：Duct directing air from a room back to the furnace to be reheated.
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Found in these illustrated scenes（2）

Electric forced air furnace Forced warm air system

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