Looking for some diy advice on installing ducting above the ceiling in my home to pull the heat from one room and dispersing it to three other rooms in the house. I have an 1800 sf house in the Northwest, L shaped, with a wood stove in the farthest part of the house, basically at the end of the L. House is single story built in 1980 with base board heating and now has a wood stove. I don't like the base board heat and would rather burn wood as its free for me. I am wanting to move the heat without putting a fan in the doorway, as it doesn't distribute evenly to the rest of the house. The room with the wood stove gets really hot and the fan isn't what I'm looking for and its in a bad location. I suspect there may be some code issues, not sure. I am wanting to know if this idea is efficient with an inline fan controlled with a switch or timer and insulated flex ducting. I would like to split off twice going to two bedrooms and then to the living room or kitchen which is at the other end of the house from the woodstove. I don't know where the best placement for the registers would be. Do I need to have return air grilles? What size ducting, fan cfm, where to buy materials? This is the first time I have posted. I've owned the home for two years and just wanting to make some improvements and stay cost efficient. I'm also not really wanting to go with a furnace due to the costs of installation and the increase in utility bills. Any advice?