We've made some mounting brackets to vent the cubes outside directly - they are made to mount to a plywood or foam barrier.  They aren't cheap to punch out - but if there is enough interest they are affordable enough.  If there's enough interest they end up being $100 USD for a set of five if we have enough folks to make an order - I use to vent the cube outside when it's warm since it's cheaper to cool ambient air than the 40C+ air these blast out.  PM or reply if interested.  No rants about how much you hate KnC please - this is for those of us stuck with hardware.