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Here is my update for my heating system:
machine: DC90 ULTRA HIGH EFFICIENCY( HEIL ).
Testing procedure:
1. Turn on themometer and to 80 degree.
2. Go to facillity room, I found machine is rnning, but when I pull out the filter and put a paper into the hole to test the air flow, I found there is no air flow.
3. I think my furnace is using Gas. But I am not sure. Will I be able to see the Gas burnning if my furnace is indeed A Gas Furnace?
Any ideas?
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