Guys, meet my roof. Well, part of it anyways. The raised part is the cathedral section. Here's the exhaust side of the venting. Aluminum soffits are covering up cedar with holes drilled into it. Haven't pulled them down yet to see exactly how much there is. Found a site about calculating proper attic ventilation (http://www.trinityexteriorsinc.com/1284/calculate-proper-attic-ventilation-5-easy-steps), wondering if you could check my calcs below and see if I'm correct. Area = 25' x 23' = 575 sq ft TFNVA = 575 sq ft / 150 = 3.83 sq ft Convert to inches = 3.83 sq ft * 144 = 552 sq in Intake = 60% = 331 sq in Exhaust = 40% = 221 sq in So if I pull down the soffits, count the number of joist bays I have, figure out the size of hole I need to cut in each to total 331 sq in on the intake side, I should be good, right? If that's ok, should I staple in some screen material over the holes to keep the critters out or do the soffits do that already? I'm not positive but I don't think I have to worry about baffles (don't think the insulation is up that high in the "attic") Thanks for any help!