Ok so I think I'm right but I'm around so much that is wrong I might be hurting my confidence. Everyone here is screaming that I should be creating ducting at .1 friction per 100'.....which is fine...but on a 4 ton system thats putting me at 1100 fpm....From everything I know thats awfully high, isn't it?
I design it for 700 fpm(especially bc the client complained about noise)....granted that takes me down to.03....but i dont see that as a bad thing...just means i have a 20x18 duct. wont i lose a LOT at 1100 fpm?
Am I an idiot (for this reason specificially) or are they right?