Do you have to close off the top of the enclosure? I kind of just want to use plywood and make it wrap around the compressor and dust collector, but make it go like 2ft taller than each machine, then put in a fan on one of the walls to circulate the air inside. So basically insulate the plywood and enclose it all except for the top. Would that still cut down on sound a bunch? I don't like some of these enclosures that completely close off the machine, i feel it's going to cause them to run too hot. And yes the dust collector and air compressor will be in separate enclosures, not together. Just want to make sure the neighbors hear the least amount of noise as possible, even though the nearest neighbor is about 100 feet away and that's the garage, their house is probably 150ft away.