Soot through the house

Tigermanrich · By: **Tigermanrich** On: Thu Feb 01, 2007 8:18 pm

more:

Tigermanrich · By: **Tigermanrich** On: Thu Feb 01, 2007 8:23 pm

two 8" hot ducts coming from the furnace room into the plenum / cold air return room where the old gas furnace used to reside

Tigermanrich · By: **Tigermanrich** On: Thu Feb 01, 2007 8:24 pm

firebox pic:

dirvine96 · By: **dirvine96** On: Thu Feb 01, 2007 8:26 pm

Are the two 8 inch connected on the supply side or the return side of the 1600cfm blower?

Don

Tigermanrich · By: **Tigermanrich** On: Thu Feb 01, 2007 8:52 pm

Don,
If I'm understanding your question correctly... the supply side. They come off of the furnace and go into the duct work 3/4 the way up from where I custom built the enclosure which houses the house fan. The bottom of the custom built enclosure is where the cold air return pulls the air from the upstairs of the house.

Tigermanrich · By: **Tigermanrich** On: Thu Feb 01, 2007 9:07 pm

Drawling of setup

dirvine96 · By: **dirvine96** On: Fri Feb 02, 2007 8:58 am

It appears you can do one of two thing. Cut new returns in the floor and duct then back to your coal furnace or run a couple of lines over to the return duct in the other room. The same way you ran the supplies. Just on the other duct coming down from the ceiling. Or a combination of the two. I'll see if i can figure out a way to do a drawing and post it. Question. is the the 1600 cfm blower direct drive or belt drive.
Don

dirvine96 · By: **dirvine96** On: Fri Feb 02, 2007 9:11 am

Here ya go. Don't laugh at my attempt to draw this with my computer. Pretty sad!

Tigermanrich · By: **Tigermanrich** On: Fri Feb 02, 2007 12:01 pm

Don,
It is direct drive..no belt. I wired it up as when the fans on the back of the furnace turn on it kicks on so it doesn't blow cold air when the furnace isn't producing heat. Now as far as pulling air from the house cold air retun....isn't there going to be a conflict with the house fan and fans in the back of the furnace pulling air from the same ducts? I would think that the 1650 cfm fan would cancel out the air being received from the two 550 CFM fans? Am I incorrect in this thinking?

gambler · By: **gambler** On: Fri Feb 02, 2007 1:06 pm

Tigermanrich, I am by no means an expert but looking at your set up I don't think that it will work. It looks to me that the large blower in the wooden box will force air back through the pipes to the coal furnace while the suction side of that same blower sucks the hot air right through the coal furnace and back to the wooden box and continues sucking and blowing in a short cycle loop.

Tigermanrich · By: **Tigermanrich** On: Fri Feb 02, 2007 1:36 pm

Gambler..that is my concern also. I believe that I will have to run a separate cold air return that does not tie into the house cold air duct work being pulled from the wooden enclosure.

dirvine96 · By: **dirvine96** On: Fri Feb 02, 2007 2:28 pm

The two ducts that you have already installed leave the top of the coal furnace and are connected to the supply side of the 1600 cfm fan. Is that correct? The key is to match the supply and return ducts. The two fans won't care if you are sharing a common duct. The key is not connect the coal furnace return to close to the suction of the 1600 cfm fan. The velocity on the return drops way off as soon as you get away from the fan. I'm asuming you put a air deverter in when you hooked up the two 8 inch ducts.

Don

PS If you duct thye way the drawing are shown it will work. Remember you need to match your air flows

Tigermanrich · By: **Tigermanrich** On: Fri Feb 02, 2007 2:49 pm

Don,
That is correct about the two 8" ducts. They are connected to the supply side. as far as the diverters...I do not have automatic ones. I couldn't find them and nobody around here sells them. I put two 8" manual draft dampers in the duct about 12" from the openings and left them wide open. Would of like to put automatic dampers, but like I said I couldn't find them.

dirvine96 · By: **dirvine96** On: Fri Feb 02, 2007 3:04 pm

The diverter go inside the main supply duct. Go to the US Stove web-site and open up one of the installation manual for their Hot Blast Furnace and good at the duct connections. You'll see what I mean as far as the diverter goes. The returns can share a common duct. It not a big deal. The fan performance may be slightly affected but not enough to make a difference. You basically want divert the hot air from your coal furnace into the air stream of your main duct system. Very simple. What your building is a parallel system.

Don

dirvine96 · By: **dirvine96** On: Fri Feb 02, 2007 3:10 pm

Remember your not trying to put 2600 cfm up into your house. You only need to worry about the 1600 cfm for the house. The 1000cfm you just want to circulate through the system and grab the heat from it. I know its a little confusing. Don't get me wrong you will get more that 1600cfm up through the duct, but not 2600.

Don