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I live in a penthouse on the 32nd floor so bypassers is not a problem. I want the windows open for vent.

I purchased a 4x4x6.5 grow tent and Im looking at the materials I need for ventilation. http://cgi.ebay.com/New-4x4-x-6-5-HYDROPONIC-GROW-TENT-HYDRO-BOXHUT_W0QQitemZ360062134499QQihZ023QQcategoryZ43555QQssPageNameZWDVWQQrdZ1QQcmdZViewItem There is a 4" flange outlet at the top back of the...