Clean Room
The Rossmann Group gets less crud behind your glass than anyone else.
Why should I care?
Your Unibody Macbook has glass covering the LCD. This makes repair trickier. When the glass is removed, and put back on, there is an opportunity for all the dust & junk in the room to get on the back of the glass or on the LCD itself and get stuck in there when the glass is adhered back onto the Unibody frame. You can't wipe this off since it's on the inside, and it will take form as little black or colored spots around the screen.
How do you prevent this from occuring?
The room used to repair Unibody models is very small, under 100 square feet. It is double doored, with seals. The only method air can get in is through a vent at the top of the room, which is fed by an HVAC system that features extensive carbon prefiltering before the air reaches the room.
Is that enough?
No! It gets rid of a lot of junk, but there is still a lot left in the air. In addition to the aforementioned setup, the spot in which your repair takes place is inbetween two filters that remove everything in the air over 0.3 microns in size, towering right around your Macbook as it is worked on. Each of the two extra filters pulls 400 square feet of air per minute, which in a room under 100 square feet, does the job excellently. Whatever got through the first filter & through the door seals is being sucked out of the air long before it gets near your Macbook.
Is this 100% perfect?
No. This isn't outer space, or a vacuum. There is no way to keep every last particle out of there, short of a clean room costing six figures to build and five figures to maintain.
However, no one in this industry uses one of those. Most of the competition uses a regular, dusty office space. While not foolproof, Rossmann Group's room is cleaner than most if not all other laptop repair shops in NYC.
