Ductwork for furnace and water heater tank
Planning to install a 60000 or 80000 btu high efficiency furnace for an old house. I am going to replace for a new return duct as I will get rid of the humidifier. Wondering if I change the size of the return duct from 8″ x 24″ to 10″ x 24″, will it help improve the performance of a 2- stage new furnace with multi-speed ECM motor? No changes will be made to other ductwork.
After installation of the new furnace, the metal chimney will only be used by the water tank. The furnace supplier said the venting duct that connects the water tank with the metal chimney is too small. should be 4″ instead of 3″ for the size of my water tank (150 liter) according to Code. He said I must change the duct to comply with code before they can install the new condensing furnace? My rental water tank was installed in 2005. The fitter did not change the vent at that time. who should be responsible now?
Would appreciate someone who can verify the size of venting duct for water heater tank? Are there any risks of not having the right size duct?
is it okay to have an orphan chimney?
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