Ducting Systems and Air Ventilation - Blower Speeds for Heat

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laynes69
11-05-09, 02:36 PM
I installed a high efficient forced air woodfurnace this summer. It has a secondary heat exchanger where extra heat is picked up from the furnace. It will push out 140,000 btus, and I was wondering if a high speed setting is better that a low or medium setting. I can get hotter heat on a lower setting, but lower air flow. What speed would be the most efficient? It has a 4 speed direct drive blower.