american standard freedom 95 furnace vent?

[psychowizard10]

i have a american standard freedom 95 comfort r gas furnace....my question is on the flue/vent pipes that run horizontal...i cant find if they need to be level slope away from the furnace or slope towards the furnace....right now it is sloped away and i have water running out of the end of it...it must not be sealed correctly cause i am getting water behind my siding. any thoughts??
there are two 2" pipes coming from the furnace they both should pitch the same?