DD prompt - draw whats outside your window. I am looking through the window of the boiler house in the hospital where I work, into the next plant room full of plant. Here you can see a large air compressor of some description and next to it there is pipework and a suction unit, then lots more pipework. Top right you can see the stairwell leading up onto the roof where the chillers and large air cooling units are located. I think if you don't work in this type of environment you will have no idea of what you are looking at here. Sorry! It really is a large room with tangles of pipework and large machinery to supply air conditioning etc..to the hospital.