Harman 5" Double-sided Fan Blade Impeller, 3-20-502221-OEM

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SKU 3-20-502221
MPN 3-20-502221

Frequently Bought Together


This 5" combustion blower fan blade is a double-sided impeller that is used on most freestanding Harman Pellet Stoves. Check out the compatible stoves tab to verify which impeller you need for your stove. 

If any of the petals (fins) are bent, your stove may vibrate. To fix this, you can sometimes bend them back to help balance the motor. It is suggested to replace the impeller if the metal is corroded, if there is metal missing or if the impeller is unbalanced through wear and tear.

If you are replacing your combustion blower motor for any reason, it is suggested to also replace the impeller. Harman has engineered 3 different sizes for their various stoves which is why they are not already attached to the motors.

Replacement For Part Number :
  • 3-20-502221

Compatible Models


  • Accentra 52i
  • Advance
  • DVC 500
  • HF60
  • Invincible Insert
  • Invincible RS
  • Magnum (44 Mag)
  • P38
  • P38+
  • P43
  • P43-C
  • P61
  • P61-C
  • P61A
  • P68
  • P68-C
  • PB105
  • Furnace & Boiler Systems
  • PF100
  • XXV

Technical Specs

Petals (fins) 24
Type Double-sided
Overall OD 5"
Shaft ID 5/16"
Set Screw 5/32"



Assembly Instructions For Harman 5" Double-sided Fan Blade Impeller, 3-20-502221-OEM

To remove the impeller blade you must gain access to it so you can physically see the paddles. Spin the paddles around until you can locate the Allen key set screw. It will be a 7/32” hole with a 5/32” threaded Allen key. It is helpful to spray the set screw with plenty of penetrating oil prior to applying any force to the set screw. If the set screw strips and many often do if they have not been turned out in years, the set screw may need to be drilled out, if you can access it with a drill. If the combustion blower is going to be changed during the process, the shaft of the combustion blower can be cut and replaced with a new motor and impeller. Personally, I assume that the screw cannot be taken out and always replace the motor and impeller together each time.


Unfortunately, sometimes products do not work like they are supposed to. We offer a 90 day warranty on manufacturer defects. Some manufacturers make this a very simple and easy process unfortunately others do not. Items must be used in accordance with the manufacturers guidelines to qualify for warranty replacement. Please be advised that warranty claims for these parts may take up to 4 weeks for processing, and customers must cover shipping.

Shipping Info

This Item Qualifies For Free Shipping With Orders Over $199!

When Will My Order Ship

All orders are typically processed within 24 hours of receiving payment and are shipped from us same day if placed before our shipping cutoff time (Monday - Friday: 1PM, Saturday: 10AM, Sunday: No Shipping), orders placed after our cutoff time are shipped the next morning.

How Does Free Shipping Work?

Most orders over $199 qualify for free shipping! Orders which ship for free are shipped with either USPS or UPS based on our discretion. If you are using a PO box, free shipping orders will always go USPS.

Is Expedited Shipping Available?

We offer both overnight and two day air shipping services for all orders placed within the Continental United States. For information on shipping cut-off times, go to our shipping page.

Do You Ship To Canada?

We ship to Canada! We estimate USPS to take 4-10 days once receiving your package from us. We do not offer expedited shipping of any kind to Canada. Please allow an extra 2-5 days for all shipments to Canada. Free shipping is not available to Canada.

Do You Ship To Alaska Or Hawii?

We ship to both Alaska and Hawaii! We do not offer next day or two day shipping to Alaska or Hawaii. Free shipping is not available to Alaska or Hawaii.

Do You Ship Outside The US Or Canada?

Unfortunately, at this time we do not offer international shipping other than to Canada.

If you wish to calculate shipping for an item which does not qualify for free shipping, or if you would like the cost to expedite your order, please do the following. Add the item you want to order to your cart and click here to be taken to the cart page where you can enter your country, state / province, and zip code for an estimate.

Shipping Time Estimations

For information on shipping time estimations, see either the Shipping Information & Transit Times on the cart page, or go to our shipping page.

Read More About Our Shipping Information

Customer Reviews

Based on 14 reviews
Terry S.

Back on line, JUST THAT QUICK , fan works Great

Carlton s.
Stove fand

Quick delivery on the order

Steven L.
Fan blade

Came right away and works great.

Stephen P.
Harman Advance Replacement Parts

The part fit perfectly. Instructions on the website were clear but unlike the experience described, I had no problem loosening the hex nut on the shaft
and removing the old fan. 5 minutes later, the stove was up and running.

charles g.
Great parts

Had the part I needed fast shipping A+


Ask a Question
  • Does this have any directions for installment? info not included in description. It may seem obvious to some, but not to all.

    Instructions are now included in the instruction TAB with the part

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