I want to thank everyone again for helping me with my last question on darkroom ventilation. If you may recall, I was having trouble coming up with a workable ventilation system for my temporary darkroom. Alas, that is no longer an issue, as my husband and I bought a new house last week, and my hubby is having the contractor build me a darkroom! It will be located in the basement (finished). It'll be ready in April - I can hardly wait!