what is the maximum allowable recirculation percentage?

What is the maximum allowable value of recirculation air for a greenhouse?

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Are you asking for a reference to a particular standard?

Adam Hilton (2017-04-06 08:32:14 -0500) edit

Dear Mr Hilton Yes I want to use maximum allowable recirculation for saving energy and water. Is there any standard?

amirrezaheydari (2017-04-06 11:56:41 -0500) edit