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So would it be better to go with a rectangle duct then? Like a 10x3.5 or 12x3.5 to get it upstairs?

The only way to get any ducts upstairs is through a wall cavity so I think my choices are limited to an oval or rectangle duct for both the supply and return. I will do like you said and swap the 6" for the 8" for the existing duct to the second floor. Which is better, oval or rectangle? What...

Yeah I plan on running another duct upstairs when I add a bathroom up there next month. I am also going to add a return duct as well. The room upstairs does not have any doors and is open all the way down the stairs to the 1st floor. Do you think that the 6" duct from the furnace to the...

All the runs downstairs do blow hard. I actually have 2 of them closed to try to get more airflow upstairs. The run upstairs has 3 - 90 deg bends before it goes upstairs and 1 - 90 deg bend upstairs to get it to the vent. The blower is definately on high speed, I looked up the online manual...

Ok the model # of the furnace is GNE075B12G1. The 1st floor square footage is 650, the 2nd floor is 300 (its a 1 1/2 story). There is a 8"x24"x8' supply trunk on the top of the furnace with 4 - 6" round ducts coming off of it for 1st floor rooms and 1 - 6" round duct for the basement and 1 -...

The blower is a 3 speed blower and is set at the highest setting. I am unsure of the cfm's at each speed. It is a comfortmaker 75,000 btu furnace 80%. There is no return air duct on the 2nd level but I plan on adding one when I add a bathroom up there in the next couple months. The rest of...

I have a 3.5" x 12" supply duct running from my basement up to my 2nd floor. The supply pipe from the furnace to the rectangle duct is a 6" round and also from the end of the rectangle duct to the register. The heat just trickles out upstairs. I was wondering if changing the 6" round to an 8"...