ReplyIt tells you that the filter/return duct system is in good shape.
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If I only stick my electronic manometer at the inlet of the furnace (before the filter)- and I get (-0.10"w.c.) reading, is that a usefull info ? Does it tell me anything at all ?
Grumpy Old Man
It tells you that the filter/return duct system is in good shape.
Banned
It tells you that the ESP of the return system excluding the filter is .1,which if "all else is well",say it's a new system on the correct fan speed, the return is fine.
The filter,coil,etc.,as mentioned before could be clogged,which reduces cfms,which lowers duct system static.
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