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This older thread got me to thinking about my rear ducts also. Today and tomorrow will be 100 degree + days and I can tell my rear ac hasn't been working well. Did the duct check and my ducts have collapsed also. Went to the hardware store, bought a piece of 1 & 1/4 pvc pipe and 8 couplings. Similar to Jim (jlb27537) I cut the pipe into 10 pieces 6" long. I stuffed a piece into the duct, added a coupling, stuffed another piece, add coupling, etc putting 30'' and 4 couplings into each duct. I could tell immediately the difference in airflow. Simple $8.00 fix.
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