Harman 4 3/4" Single-sided Fan Blade Impeller P35i & Accentra Insert and more, 3-21-00661-OEM

SKU 3-21-00661
MPN 3-21-00661
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Frequently Bought Together


This 4 3/4" combustion blower fan blade is the single-sided impeller that is used on the Harman Accentra Insert, P35i and P35i-C Insert, and the PF120 Pellet Furnace.

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.

Harman makes three different sized impellers for use in various stoves and inserts. Please make sure you are ordering the correct impeller for your specific stove or insert. There is also a 5" single sided impeller, part # 3-20-40985 and a 5" double sided impeller, part # 3-20-502221

Replacement For Part Number :
  • 3-21-00661

UPC #: 652174715008

Compatible Models


  • Accentra Insert
  • P35i
  • P35i-C
  • PF120

Technical Specs

Petals (fins) 12
Type Single Sided
Overall OD 4 ¾"
Shaft ID 5/16"
Set Screw 5/32 Allan Key



Assembly Instructions For Harman 4 3/4" Single-sided Fan Blade Impeller P35i & Accentra Insert and more, 3-21-00661-OEM

In a perfect scenario, everything comes apart easily, however; the impeller can become seized on the motor shaft if it has never been removed, in which case the shaft of the motor must be cut. This will require a new impeller to be mounted on the new motor so you will want to have one of those on hand. See the description for this b lower to figure out which impeller you need, there are three (3) types to choose from, depending on your stove model. If you need to cut the shaft, a hand-held hacksaw blade is the best tool. It needs to be long and narrow because it need to fit between the motors cooling fan and the stove wall from behind the stove. You will also need to jam a screwdriver or something between the impeller and stove wall in the fire box to keep the shaft from spinning as you cut through the shaft. This same process may need to be done for stoves that use a removable hub but it will be easier because the whole assembly can be removed from the stove when cutting.


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 $99 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.

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Customer Reviews

Based on 10 reviews
Joe A.

Harman 4 3/4" Single-sided Fan Blade Impeller P35i & Accentra Insert and more, 3-21-00661-OEM

Lorn M.
motor and fan blade

I blinked and it arrived! very quick. It made a big difference

Brian L.

Harman 4 3/4" Single-sided Fan Blade Impeller P35i & Accentra Insert and more, 3-21-00661-OEM

Very Happy

Parts came sooner then estimated. Worked perfectly and were priced fairly. Will definitely recommend.

Don D.
Fan Blade for P35i Harman pellet stove.

I ordered this blade because I was informed that when replacing the exhaust blower motor there is the possibility that the original fan could become stuck on the blower shaft. I was able to compare this new fan to the original fan and it was an exact match to the factory blade. So far I have had no problems.


Ask a Question

    Yes, the Harman Advance uses a 4 3/4" single impeller blade

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