FAQ What is the required slope for the drain line? The drain line must maintain a 1/4" per foot 20 mm/m downward slope to the drain.What should be used if no indoor floor drain is available? A condensate sump pump MUST be used if required by local codes, or if no indoor floor drain is available.How can condensate from entering the pressure switch be prevented? Ensure that all pressure switch hoses are routed such that they prevent any condensate from entering the pressure switch.