Take the messurements to yr local d.i.y store and get a piece of mdf this will allow you to fix your intake/outake fan to and will also reduce any noise.Staple some black and white polly to the inside of the room and the new door,put the polly around the door so any light will not leak out.Make sure that the intake and out take fan's are on the opersite side's of the room or if you have to put them on the same section have the outake low down and the intake high up,or you will find that you will be takeing in air that has been flushed out of the room.18mm mdf will be the best...............tyke............................