I have a fireplace in the living room, which also happens to have the only thermostat in the house. I like to burn it alot in the winter, but the back bedroom gets pretty cold.
What I'd like to do is run a small duct with an inline fan through the crawlspace from the back bedroom to the living room, and suck the cold air out of the bedroom so that warm air can flow down hall and keep things a little more reasonble.
The run is about 50 feet, probably flexible duct. Two 90 degree elbows and a floor grate on each end. I'm considering either 6" or 8" duct. For the 6" I found inline fans claiming 160 & 250 CFM. For the 8" I have 500 & 210 CFM. I would like to estimate the total CFM for the installed duct.
Any suggestions? It's a ranch style house and the bedroom is about
20x30 feet, 8 foot ceilings throughout.