adding fan inside og 6" duct pipe

Hi Everyone,

I have a magnum stoker and laast year I pu the 6" pipe from the duct opening on top of the stove and ran it about 10 ft to a floor register I cut in my living room. The stove is in my basement\family room.

The stove distributon motor did a good job pushing the war\hot air to the regester. This year I want to add a second piec to an addition resgister but feel I will need to give it some boost to pull more heat from the stove. Any ideas on adding inline fans to the duct pipe that will move more air from the stove tot he registers I connet to. I dont think I will be able to do more than 2 registers form the magnum. I have radiator heat so no internal duct work fromthe house to connect to.

Any idead or suggestions will be greatley appreciated.

Install a cold air return duct to the distribution fan on the Magnum, it will do more than trying to push more hot air.

Greg L.

hey ls thanks for the input. should I bring cold air in from outside? for this to work better? -- and I wiont see a benefit to adding intetrnal fans to my ducts leading to the upstairs?

Hi Jimbo:
I think Ls intended that cold air return to provide a route for the cooler air in the house already to find its way down to the stove to be reheated and circulated either by you fan system or by natural convection. When the heavier cold air sinks down to the basement level, it will cause the warmer air to circulate upstairs and distrubute the heat for you without using a fan.
John

Sorry jimbo, I started to write and got called away before I could write a better comment.

What you need is a loop of air circulation. Right now you have a duct getting hot air from the stove to the main floor. Just adding a second duct will not necessarily move more air. You can only force so much air into a certain space. You need to create an outlet or cold air return and duct this air back to the stove in the basement.

What would work best would be to put a return air vent in a room in the main level of the house, as far as you can from the hot air vent you currently have. Use 4" or 6" duct from this return vent to the back of the coal stove, and have the duct end right at the inlet of the distribution fan for the stove. [not the stoker fan inlet].

This will create a positive return pathway for the air that was heated and sent upstairs, to return back and get reheated by the stove. This is how forced hot air furnaces work, all air is heated, circulated, returned and reheated.

I hope this makes sense.

Greg L.

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Jimbo,

Don't use inline duct fans, they will quickly burn up, they can only handle about 160-180 degrees.

What worked for me was the Tjernland draft inducer fan, it is made to handle high heat and exhaust gases and they can move a lot of air.

BK

thanks for the reply - could you post pics of how you are using this setup?

I have pics on page 6 and 7 in "pics of your stove catagory"
But it does not show the Draft inducer used as a duct fan. I added it at a later date when I burned up the original duct fan.

I will try to get a new picture of it in a couple of days.

BK

I think there is one of the mentioned draft inducers on Ebay, under 'coal stove' .
I don't remember the current price though.

Greg L

bksaun wrote:Jimbo,

Don't use inline duct fans, they will quickly burn up, they can only handle about 160-180 degrees.

What worked for me was the Tjernland draft inducer fan, it is made to handle high heat and exhaust gases and they can move a lot of air.

BK

\

Shoot! I added 3 inline duct fans last year and they helped get the air to 2 registers that I installed ~20' away from the stoker.

I hope they don't smoke on me!!!

I like the idea of draft inducers. They sound expensive to me.

Beatle,

You should be fine with them that far away.

Due to my duct configuration I had mine 3 feet above my stove, so you can see why they failed as soon as I ran the stove on a high setting.

BK

If the duct fans are far enough away, the in-duct temperature may be low enough to not damage them.

Are they plastic or metal fans?

Greg L

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Greg,

I had the metal ones and they gave up pretty quick, I was just too close to the stove.

BK

AH, I thought the plastic fan blades melted, so the motor couldn't handle the heat?? Interesting, they must plan on the fans being installed at the duct exit.

Greg L.

bksaun wrote:Beatle,

You should be fine with them that far away.

Due to my duct configuration I had mine 3 feet above my stove, so you can see why they failed as soon as I ran the stove on a high setting.

BK

OK, that's good to know. I ran them for about 2 months at the end of the season with no issue. I'm just hoping it's not a failure waiting to happen.

You're probably right. The distance may be enough where they will not fail on me.