Hi, Jon. I've found even 50% RH may be too high. As Paul says it depends on your system but the more low-tech it is, the less humidity it will take to clog it. Usually there will be days between Thanksgiving and Christmas where it is sunny and dry with RH down to 25~30%. Those are the ones you want. Right now is like a swamp in North and Central TX. You have a sand hood, yes? Good luck.


~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end