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• Use 4” pipe if you have more than 15 feet of equivalent vent length. • Horizontal runs shall not exceed 10 feet of EVL. • It is recommended that vertical runs be a minimum of 8 feet. • To calculate EVL, use the following conversions: 90. elbow or “T” = 5 equivalent feet 45. elbow = 3 equivalent feet Horizontal Pipe Run = 1 equivalent foot per actual foot Vertical Pipe Run = 0.5 equivalent foot per actual foot NOTE: At altitudes above 3,000 feet, we suggest the use of 4” diameter vent at an EVL