hi everybody. I have finished to build an 8x10 b/w enlarger. I used the book by Ansel Adams as a guide. It is horizontal. I used a couple of opal plastic layers for diffusing the light of 16 normal tungsten bulbs (40w each). The problem I am experiencing is I can't successfully dissipate the heat generated by the bulbs. I tried using two fans I recovered from an old computer, but it doesn't seem to work. The opal screen is nearly 10 cm far from the negative and other 10 cm far from the bulbs. How strong should the fans be to help keep the temperature down? Can anybody suggest a solution?