https://community.extremenetworks.com/t5/general-discussion/is-3-ru-really-necessary/m-p/7513#M54 I know the x440-8t does not utilize a fan for cooling, but is it necessary to eat 3 RUs? Any chance a mount design change can be tested to change the real estate needed to maybe 2 RU? Thu, 06 Oct 2016 02:04:00 GMT Joe_Sheldon_ 2016-10-06T02:04:00Z https://community.extremenetworks.com/t5/general-discussion/is-3-ru-really-necessary/m-p/7513#M54 I know the x440-8t does not utilize a fan for cooling, but is it necessary to eat 3 RUs? Any chance a mount design change can be tested to change the real estate needed to maybe 2 RU? Thu, 06 Oct 2016 02:04:00 GMT https://community.extremenetworks.com/t5/general-discussion/is-3-ru-really-necessary/m-p/7513#M54 Joe_Sheldon_ 2016-10-06T02:04:00Z https://community.extremenetworks.com/t5/general-discussion/is-3-ru-really-necessary/m-p/7514#M55 Hello!<BR /> <BR /> If you mean - units in rack (free space) for better cooling, so:<BR /> <BR /> X440 have <B>side to side</B> passive cooling, so you can don't leave 1RU free space between 2 switches in rack (also X440-8t more narrow then other switches).<BR /> A lot X440 swithces normally work with minimal free space between switches.<BR /> <BR /> BUT also there is document - "SummitFamily HW Install Guide" -&gt; Chapter "A Safety Information", which says "<B>Establish at least 3 inches clearance on all sides for effective ventilation</B>" - so it's about 1,5RU.<BR /> <BR /> Thank you! Thu, 06 Oct 2016 11:08:00 GMT https://community.extremenetworks.com/t5/general-discussion/is-3-ru-really-necessary/m-p/7514#M55 Alexandr_P 2016-10-06T11:08:00Z