so I'd like to get some heat to the third floor. There is a 10x10 heating duct that terminates as a 4" duct, into the third floor. That duct is visible at the ceiling, and is just a couple feet from the wood stove. I dont know if the heat would wander up that duct (assuming there was a cold air outflow up there), or should I be finding an electric fan to stuff air up there? Also, should I angle the fan once I cut a hole in the duct so to blow air upward rather than just in to the duct? A thru the wall range top fan would have the cfm's....im not sure if a little computer type box fan would be sufficient....unless it was run all dau. Sca
I would plan on an electric fan to help out. I think it would work better if the fan pulled the air up instead of pushed the air (although that is just a feeling - I have absolutely no professional experience/knowledge to back that up). It might even be handy to get a fan that you can set a temp to and it will turn itself on or off. When I just had the basement pellet stove in early 2014, I got a couple of these suncourt register boosters and placed them over registers I had cut. They also make flush mount boosters. If you are set on an in-duct fan, I'm no help there but maybe someone else has experience or suggestions.
That little device is nifty. If its quiet, it would probably do well on the upper floor. And it would be one less thing to look at downnstairs by the stove. Sca
I just plugged one in to check the noise, and it is pretty quiet. The gentle noise would just be a vague back-ground sound.
I ended up cutting baseboard on the upper floor away from the heating duct where it comes through the floor. I bought a fairly inexpensive bathroom exhaust fan, 70 cfm, DC brushless, and set it on top of the duct. I used rock-wool to seal off gaps in the floor, and tape to seal off holes in the fan unit. I lit a bit of incense and watched the air move at a good clip up through. I thought of pushing air up into the duct, but then I could visualize some of that going down towards the furnace. So I think sucking it up from up is more efficient. The vent upstairs is 4" diameter, the opening in the duct work, above and a few feet from the wood stove, is 8" x 5.5". Air almost just rises through there.
