| 摘要 |
Unit is as in FR. 69,22682 (8.7.69). Each duct contains a tube which extends from its inlet along part of its length, to circulate a fraction of the air in the duct without permitting access to the duct's opening near the inlet, in order to produce a regular air flow over the whole length of the duct. Pref. the opening of each distributing duct is covered by perforated metal or metal cloth.
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