Heat duct

[Josh36]

Not sure if this is the right place but I had a question. I'm putting a outdoor woodstove in. I have no heat duct in my house. The stove has a 1800 cfm blower with a 10 inch Comming out the back. I'm going to have 20 foot of main trunk. I didn't know if I should make my trunk a 10 bye 12 close to the same size as what the stove is feeding. I was going to use 6 6 inch lines Comming off the main trunk. I don't want to starve for air so I wasn't sure if my main trunk line needed to be bigger thanks everyone