You'll never get it!
1. 80% furnace vented into brick chimney, no tile liner, no metal liner
2. 4 ton Bard on Trane with 3 ton drive. Duct capacity about 3 tons max.
Stand by for the after picture on the Wall of Pride! Old house used as hair salon. Will have 5 ton air, 80% with 5 ton drive, chimney liner and full duct capacity!