Articles

What is a main line and where is it?

June 10, 2016

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, us…

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How do I tell if it’s a register vent or return vent?

June 9, 2016

Vents or register vents blow air into the rooms and return vents are sucking air in. Register vents are usually smaller than return vents. If you are still not sure what is a register vent and what is a return, you can make a simple test. Turn on your furnace …

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