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What is a main line and where is it?

Main lines are usually located on the furnace.

There can be from one to four lines on one furnace.

Main lines are the large metal square or rectangular lines that connect the furnace to the vents and returns.

When main lines are cleaned for the first time, usually technician drills a littles hole in them, and this hole can be used for cleaning in the future.

10.06.2016