Yeah Rick in my little corner of the world when a 75K BTU output would do they will put in a 100K BTU output because there is so little difference in price. And then they will put in a highly restrictive filter so now because the ductwork is too small and the filter is too restrictive there is no way the blower can move sufficient air and the furnace starts out it new life by overheating the heat exchanger, in addition if the gas pressure does not get set correctly and the gas valve does not get converted properly if it is an LP application so the problem compounds.
For a few years I did static pressure duct studies on every system that I worked on and found, that in my area at least, about 70% of the systems had undersized ducting especially on the return air side. That included even new systems.
Now I have to be perfectly honest and admit not all of these were DIY installs but many were done by professionals and in some cases the furnace was sized correctly but the duct work was not.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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