Answer to our Trade Knowledge Question: 1/8 inch
Condensate from all cooling coils and evaporators shall be conveyed from the drain pan
outlet to an approved place of disposal. Such piping shall maintain a minimum horizontal
slope in the direction of discharge of not less than one-eighth unit vertical in 12 units
horizontal (1-percent slope). Condensate shall not discharge into a street, alley or other
areas so as to cause a nuisance.