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Hello, try to remove the vent form the unit and dry one load, if it does not dry then you have a bigger issue with the unit, if it does then you have a venting issue. Try and let me know.
OK then you have a venting issue, either the vent is blocked, kinked or too small. You need a 4" vent to the outside. You can not use the periscope style vent with the LG units, it restricts too much airflow.
No the height does not matter you just need it to be 4" all the way wherever it is going out of the house, and make sure the outside vent hood does not have a screen on it either as that will cause issues.
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