How to Reduce the Fan Noise of a Harman Magnum

A Coal stoker furnace or stove controls most operations including automatically feeding the coal. They are quite similar to any conventional oil and gas units and easily operated for extended periods of time. They commonly use rice coal but may use larger sizes like buckwheat. They can be used as primary heat, supplementary heat or have a dual set up with your existing oil/gas furnace.
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Posts: 17
Joined: Sun. Mar. 02, 2008 10:33 pm
Stove/Furnace Make: Harman Magnum

Post Sun. Mar. 02, 2008 10:42 pm

How do you reduce the fan noise with the Harman Magnum? It is on a brick hearth and a brick chimney. I was thinking about building a wall from the side back to the brick chimney and putting sound proofing foam in each wall and the floor and the back of the brick chimney. I am hoping that I could absorb some the the fan noise. The fan will get plenty of air from underneath. What do you all think?

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Stove/Furnace Make: Alaska
Stove/Furnace Model: Channing III

Post Sun. Mar. 02, 2008 11:48 pm


Is it really that noisy?

I am having a Magnum Stoker installed on Tuesday and my heart sinks just a little to hear about a noisy fan. It's replacing a hand fed stove so the silence of it burning will be missed. I never saw the stove in operation and never gave a thought to a noisy fan.

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Stove/Furnace Make: Baker
Stove/Furnace Model: insert, modified
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Post Mon. Mar. 03, 2008 7:38 am

Fan noise sucks....good luck

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Post Mon. Mar. 03, 2008 8:25 am

is it the fan making the noise or is it the noise of the vibration between the fan mounts and the mounts on the stove?

It's a metal to metal contact. Sometimes if I cock the fan on a slight andle it will sit in the groove a little tighter and the vibration noise goes away.

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Stoker Coal Boiler: Hybrid, Gentleman Janitor GJ-6RSU/ EFM 700
Hand Fed Coal Stove: Hitzer 503
Coal Size/Type: Pea Stoker/Bit, Pea or Nut Anthracite
Stove/Furnace Make: Hitzer/ EFM-Gentleman Janitor
Stove/Furnace Model: 503 Insert/ 700/GJ-62
Location: Hustonville, Ky

Post Mon. Mar. 03, 2008 8:59 am

Put a small strip of construction paper between the fan flange and the groove on the stove it fits in, takes some patience. I put a dab of crisco on the paper to help the fan slide in without tearing the paper.

Helps dampen the vibration.

"Corn Stoves", It is morally wrong to burn something you can make into Whiskey!


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Stove/Furnace Make: Harman Magnum

Post Mon. Mar. 03, 2008 1:00 pm

How about putting stove caulk around the stove where the fan is?

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Hot Air Coal Stoker Stove: Keystoker 90K, Leisure Line Hyfire I
Coal Size/Type: Rice
Stove/Furnace Make: Keystoker, LL & CoalTrol
Stove/Furnace Model: 90K, Hyfire I, VF3000 Soon
Location: Cuba, NY

Post Mon. Mar. 03, 2008 1:10 pm

build a little box with celotex foam or something around it to absorb the noise....
- Dave
Hyfire I & Keystoker 90K heating an 1890 Victorian
- Amsoil Authorized T1 Certified Dealer

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Stove/Furnace Make: Harman and Liberty
Stove/Furnace Model: Magnum and Victory 700
Location: Mt.Carmel Pa. Located on The Western Middle Anthracite Field

Post Mon. Mar. 03, 2008 1:56 pm

I noticed the same thing last week with our Harman and it was funny cause it wasn't a problem all season, it was that vibration thing and giving it a little pressure with my hand silenced it so Sunday I took it off it just slides out then went down the cellar fired up a little air compressor we have and BLEW it out real good Blower, Housing and Motor and cleaned the grooves it slides into got a good bit of dust out some of it heavier coal fine type like the kind that come out of the little clean out tray.
Seems to have done the trick so far .
"No Fuel Like An Old Fuel"

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Hot Air Coal Stoker Stove: Harman Magnum
Coal Size/Type: rice/anthracite
Location: Berks County, PA

Post Tue. Mar. 04, 2008 9:59 pm

Mine's the same, too. The fan itself runs quiet, but it's that little bit of play in the flange that the fan slides into where she hums. I took a small block of wood and cut it to fit snugly around the fan housing and press tight to the floor. That bit of pressure is all mine needs to keep quiet.

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Stoker Coal Boiler: Leisure Line WL110 Dual Fuel, natural gas
Hot Air Coal Stoker Stove: Leisure Line Lil' Heater (rental house)
Coal Size/Type: Rice and Buckwheat Anthracite
Location: Wilkes Barre, PA

Post Sun. Mar. 09, 2008 12:38 am

As already stated regular cleaning does wonders for fan balance and therefore quiet. Also if you just slightly bend one corner of the flange it has the same effect as the wood/construction paper/caulk by making the fan slide in snuggly with no extra materials needed. Of course the combustion and convection fans can both be treated in the same manner.

After operating 5 different Magnums for a total of a couple years I have not noticed any sustained fan noise that needed dampening aside form the cleaning and preventing rattling solutions. :)
Leisure Line Stove Company

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