hello gents, got a ahu thats leaking condensate, this is the situation. condensate from the evap coil wont run down condensate drain line because the supply air fans seems to be pulling on this water and by intrainment depositing it further along the duct work where there is no drainage and so it leaks where it can. what i find is if i turn the supply air fans off water drains quite freely down the condensate drain or the same thing happens if i open the filter asscess hatch down stream of the evap coil. note the problem is not the condensate drainage pipe work. any help would be great.