GE PFDS455GLMG Use and Care Manual - Page 27

Installation Instructions WARNING - USE ONLY METAL 4″ DUCT. DO NOT USE DUCT LONGER THAN SPECIFIED IN THE EXHAUST LENGTH TABLE. Using exhaust longer than specified length will: • Increase the drying times and the energy cost. • Reduce the dryer life. • Accumulate lint, creating a potential fire hazard. The correct exhaust installation is YOUR RESPONSIBILITY. Problems due to incorrect installation are not covered by the warranty. The MAXIMUM ALLOWABLE length of the exhaust system depends upon the type of duct, number of turns, the type of exhaust hood (wall cap) and all conditions noted below. EXHAUST LENGTH RECOMMENDED MAXIMUM LENGTH Exhaust Hood Types Recommended Use only for shortrun installations 4″ DIA 4″ DIA 4″ DIA No. of 90º Elbows 0 1 2 3 4 5 4″ Rigid Metal 150 Feet 135 Feet 125 Feet 115 Feet 105 Feet 95 Feet 21⁄2″ Rigid Metal 125 Feet 115 Feet 105 Feet 95 Feet 85 Feet 75 Feet EXHAUST SYSTEM CHECKLIST HOOD OR WALL CAP • Terminate in a manner to prevent back drafts or entry of birds or other wildlife. • Termination should present minimal resistance to the exhaust airflow and should require little or no maintenance to prevent clogging. • Never install a screen in or over the exhaust duct. This could cause lint buildup. • Wall caps must be installed at least 12″ above ground level or any other obstruction with the opening pointed down. SEPARATION OF TURNS For best performance, separate all turns by at least 4 ft. of straight duct, including the distance between the last turn and the exhaust hood. TURNS OTHER THAN 90º • One turn of 45º or less may be ignored. • Two 45º turns should be treated as one 90º turn. • Each turn over 45º should be treated as one 90º turn. SEALING OF jOINTS • All joints should be tight to avoid leaks. The male end of each section of duct must point away from the dryer. • Do not assemble the ductwork with fasteners that extend into the duct. They will serve as a collection point for lint. • Duct joints can be made air- and moisture-tight by wrapping the overlapped joints with duct tape. • Horizontal runs should slope down toward the outdoors 1/2″ per foot. INSULATION Ductwork that runs through an unheated area or is near air conditioning should be insulated to reduce condensation and lint buildup. 27