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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8164
Experience:  Furnace, A/C and heat pump specialist.
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I have a carrier oil furnace OBM112 or OVM112. I believe it

Customer Question

I have a carrier oil furnace OBM112 or OVM112. I believe it is variable speed. It is hooked up to existing duct work that was set up for a previous (probably smaller) furnace and seems noisy. There is one supply duct of 8 x 12, and a second duct of 8 x 14, that splits into an 8 x 14 and an 8 x 10. Is this sufficient? It seems very noisy when it kicks into maximal speed.
Thanks, John
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

John those ducts should be sufficient.The 14 x 8 should handle about 850 cfms and the 12 x 8 should handle about 750 cfms.