EDIT: Crap, meant to post this in DIY... my bad. Hi, I originally posted this in the pellet forum (since I have a pellet stove), but thought I might get some good advice here too. My house is a old new england colonial with an addition on one side, which is where my stove happens to be. The addition has vaulted ceilings, with one wall running up along side where the master bedroom is on the 2nd floor (see photo). Iâ€™m considering putting a vent in the top of the wall of the addition, through a small crawlspace and into the bedroom wall (close to the floor) to help the warm air from the pellet stove get to the bedroom upstairs. I donâ€™t have any existing ductwork in the house, and I've never done any type of ductwork myself. Originally I looked at thru wall fans that seem ideal for this (http://www.suncourt.com/Suncourt ThruWall Fans.html), but those are not long enough to make it through my crawlspace (about 2.5 feet). After researching, I'm thinking that flexible duct with a fan might work, but I'm not sure how wide the duct should be or how the duct fan would be hooked up to a switch (I'm not electrically inclined either ) Any advice or suggestions would be appreciated... Thanks in advance!