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The problem is, household appliances(furnaces, water heaters etc) cant handle 3-4 psi coming into them. The gas valves could be damaged, leading to the unit overfiring wich could cause damage to a furnaces heat exchanger and it producing excessive amounts of carbon monoxide. Here is the tag on my hot water heater. 14" w.c. = .5psi
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'83 300D 198,000mi Howard
'03 Saturn Vue CVT 75,000mi(wifeys)
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