Quote Originally Posted by motoguy128 View Post
+1 on hte dryer vent. I really hope that's a fresh air intake of some sort. A codnenser coil will make a fine lint catcher and the warm moist air will make nice ice, droppping effciency by putting you into defrost a little quicker.
Here's a pic of the vent from inside the mechanical room. Based on it's location, could have been an old vent for the water heater?