Apr 7, 2016 · In typical office space with suspended ceiling tiles, do we consider the 2 feet return air plenum as a part of the zone in regard to the zone cfm calculation? what would happen if …

Aug 29, 2007 · The problem is if you are going with a plenum return system you must be able to guarantee that the build is constructed air tight and that there are no leaks above the ceiling …

Aug 29, 2003 · It's quite normal to use the ceiling void as a return air plenum. It saves on return air ducting as well as the thickness of insulation required for the supply air ducting. If it's …

Apr 2, 2019 · The return is not directly connected to fcu, it is connected to plenum box. Therefore, manufacture has no any role in this case, because plenum box designed by contractor as per …

Nov 8, 2011 · My building was designed as a full plenum return with a completely enclosed plenum until this point. My only option was to design it so that the return air from my southern …

Feb 10, 2005 · This is common practice, and has created problems everywhere. Ducted returns work much better from a heat management perspective, but aren't widely used, maybe …

Jun 11, 2008 · I have a large ceiling void that I want to use for return air plenum instead of ducting directly from the room. The problem is the plenum top section is a roof made from metal …

Nov 2, 2005 · Once the air enters the plenum at positive pressure, you should check the pressure gradient in the return system. It may happen in the plenum itself or somewhere along the …

Nov 5, 2003 · Occasionally we have to run natural gas piping above the ceiling in return air plenums. This has come up recently in a couple restaurants. Can't find a code limitation. I …

May 18, 2013 · Plenum return is fine if you have air tight ceiling void as in office towers with concrete floors. Plenum return is not to be used in buildings with metal deck or similar roof …