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- Posts: 42
- Joined: Sun. Jan. 20, 2008 7:27 pm
- Stove/Furnace Make: us stove
- Stove/Furnace Model: clayton 1800 wood/coal furnace
- Location: chester county PA
I have a clayton 1800 wood/coal warm air furnace. the manual states to use egg size coal. I currantly use stove coal(one size smaller)w/ huge success. These furnaces hate small coal. If your having burn problems use the biggest coal you can buy and you'll see a big improvement. again baro. Damper is a must w/ these units.