The REF 3 generates a lot of heat of its top.
Space to the upper shelf depends on the temperature level you have regularly in the room, shelf material and kind of equipment ( tubes or SS ) you have on the upper shelf . 2" space to the upper shelf may not be good enough.
Space to the upper shelf depends on the temperature level you have regularly in the room, shelf material and kind of equipment ( tubes or SS ) you have on the upper shelf . 2" space to the upper shelf may not be good enough.