Clearance around a Behringer DCX?

diyAudio Member
Joined 2007
I'm getting ready to put my system back into action.
I don't have a rack mount and need to knock something up quickly.
Unit is going into a cheap IKEA TV cabinet with only passive ventilation.
I've read the manual several times and if there is information about minimal clearances I have missed it.
Can the members here give me a quick guideline to a good minimum clearance around these units please.
Space is tight or I'd simply allow 1RU top and bottom
Thanx in advance