Hi, I am not trying to be unhelpful but the extraction rate depends on the quality and depth of the filters. If you extract to strongly and/or the filters are not sufficient the the fan will pull the solution through the filters and out into the environment. Where you place the fan is not that important because it will eventually drop to the floor and you can capture the solution at any height. I am presuming you are not using a tent or anything similar and in that case you will need a fan powerful enough to pull solution from all parts of your room or you will still be cleaning it up. It seems a lot of expense to make a hole, plus wiring, plus correct filters etc when it may not work at all and there is no way of knowing until you have fitted it and done tests. There are much less expensive options on the market.