Originally Posted By: mcyr
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No matter what the code is, the bottom line is that if the code calculations are used, a dryer vent should not exceed 15 feet. More likely then not, two 90's will be used. Beyond that a forced inline fan booster must be utilized that is tied in with the dryer electrical circuit with the use of a micro switch that turns on the fan when the dryer is energized.
The best thing to report is the fact that the dryer vent seems to exceed it's designed use for length of the exhaust, and recommend review of the manufacturers recommendation of the exhaust criteria for proper venting.
Excessive vent duct could be a fire hazard at it's extremities.