GFK21 Fireplace Blower Fan Kit for Heatilator Fireplaces

Manufactured in the USA, Pre-Wired & Pre-Assembled, 100% Ball Bearing Construction

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 5.0 Stars

$110.95 MSRP $155.95    $45.00 OFF MSRP
* All prices are subject to change


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Ships to Canada USPS for $23.95 USD

About this Item

The GFK21 fan kit is designed to fit a number of fireplaces, including many models from Heatilator, Majestic, FMI and CFM. The blower kit includes all of the components you'll need to successfully install a blower into your fireplace for the first time. The GFK21 is a free standing blower that mounts universally with the supplied Velcro strips and double-sided tape.

Because of it's small size, the GFK21 is ideally suited for small gas inserts where space is limited.

A fireplace blower kit is an efficient and affordable way for you to finally take advantage of your fireplace's wasted heat energy. A properly installed blower kit will last for years and provide your home with energy saving heat.

Read more about how fireplace blowers work.

Included with Purchase

  • Ball bearing blower
  • Pre-wired harness for easy installation
  • Rheostat variable speed control
  • Thermostat on/off switch (galvanized bracket)
  • 3-prong power cord
  • Velcro & mounting magnet
  • Installation instructions
  • 1 year warranty

Installation Notes

Contractor installation instructions are provided with the kit. The kit is pre-wired for easy installation, but always consult with a professional if you experience problems during the installation. We're available by phone at 262-989-4882.


  • Helps reduce costly energy bills
  • Heats large rooms efficiently
  • Installs quickly and easily
  • Affordable

Assembled in USAread morecollapse

This aftermarket fireplace blower kit is the culmination of years of our own research and development. It is designed in every sense to meet or exceed OEM specifications, which is why we back our claim with a comprehensive 1 year warranty. Don't be fooled by other aftermarket kits on the market. Most of our competitors are simply resellers with inferior products and higher prices.

All of our blower kits are assembled and tested in the USA (Racine, Wisconsin) by hand. In fact, when you call us at 262-989-4882, you can speak with the person who will personally build your kit. Please be sure to compare our dimensions with your fireplace's available clearance and dimensions. While we provide instructions with each of our kits, the instructions can be limited due to the sheer number of fireplace manufacturers and fireplace models. We are always available by phone to assist or answer any questions you may have.

Warranty Detailsread morecollapse

We believe you should feel safe when making a purchase from, which is why we offer a full 1 year warranty on everything we sell.


So what's included with our warranty?

Our warranty is a 1 year piece of mind that you're purchasing the most recognized aftermarket blower or fan kit available. We cover all parts and labor associated with the repair or replacement, we have incredibly fast turn around, and quite honestly the best customer service you'll find in the industry.


Warranties start on the date of purchase and extend exactly 1 calendar year or 365 days from this date.


Extended warranty

Our 1 year extended warranty plan covers your purchase for an additional year after our manufacturer warranty expires. We're so confident in our blowers and fan kits, that we're the only fireplace blower retailer to offer one.

Even accessories are covered

When I mean we cover everything, we cover everything. Accessories like thermostats, rheostat variable speed controls, and power plugs are all covered under under our comprehensive 1 year warranty.


No excess is payable upon a warranty claim

You pay no excess if you need to make a claim, simply call us at 1-262-989-4882 or 1-262-989-4883 to make a claim with one our helpful associates. We will issue a return authorization number, which can be used to return defective parts.


* Please note that shipping costs to return defective items is not covered and will not be reimbursed. Return fees are the responsibility of the purchaser unless special considerations are made with

Technical Details

Length x Width x Height (inches w/ bracket) N/A
Length x Width x Height (inches w/o bracket) 7.5 x 3.73 x 3.23
Air discharge length (inches) 4.76
Motor Type AC Shaded Pole
Motor Bearing Type Ball
Outboard Bearing Type Ball
High Temp Lubrication Yes
Insulation Class H (rated to 392°F)
Motor RPM 3000
Airflow in C.F.M 80
Mounting Free standing, Velcro
Volts 120
Frequency (hertz) 60
Power Consumption (watts) 35
Power Cord Yes
Power Cord Length (inches) 38
Power Cord Type 3-prong
Rheostat Variable Speed Yes
Thermostat Yes
Thermostat Type Magnetically mounted
Thermostat Temperature 120°F/90°F
Blade Material Aluminum
Frame Material Aluminum
Packaging Materials Shipping box, bubble wrap, foam

Also Known As

  • FK21 , GFK21A , GFK21B (timer circuit not available) , R7-RB21K (Electric Motor Warehouse) , HB-RB21K (ROTOM)

Compatible Fireplaces & Modelsread morecollapse


GNBC30 , GNDC30 , NB3630 , NB3630M , NB3630MI , NB3933 , NB3933I , NB3933M , NB3933MI , NBV3630 , NBV3630I , NBV3933 , NBV3933I , ND3630 , ND3630I , ND3630L , ND3630IL , ND3630M , ND3630MI , ND3933 , ND3933I , ND3933L , ND3933IL , ND3933M , ND3933MI , NBV3630 , NBV3630I , NDV3933 , NDV3933I , NDV3933IL , NDV3933L , NEVO3630I , NEVO4236I , NNXT3933 , NNXT3933I , NNXT3933IL

Universal Installation Options

The GFK21 blower kit often makes an excellent substitute for more expensive OEM kits and for fan kits that have been discontinued. Always ensure that you have adequate space below your fireplace before choosing the GFK21 kit. If you have installation or compatibility questions, please contact us directly at 262-989-4882.


Stock & Delivery

Unlike our competitors, we are not a third-party supplier of aftermarket blower kits. We assemble, test, and inventory all of our product in our Racine, WI USA facilty. We pride ourselves in providing the finest quality aftermarket blower kits on the market.

Please review our inventory statuses below.

In Stock Now

The item is in stock in our Racine, WI location or one of our domestic or international fulfillment centers. Orders are shipped next business day. Please allow for additional delivery time during holidays. We have no control over courier shipping schedules.


The item is available for sale but isn't quite ready for shipment. This may be due to a backordered part or a late shipment from one of our suppliers. Please call us at 262-989-4882 or 262-989-4883 and we can either take your order by phone or put you on a short waiting list.


This is unlikely, but unfortunately, not even we can prevent all things from being backordered from time to time. Please call us at 262-989-4882 or 262-989-4883 and we can provide a much more detailed reason for the backorder and a time when we expect to receive additional inventory.

More on Delivery Information

Customer Review(s)

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 5.0 Stars
Good things come in small packages

For this size of this blower, it throws out some serious air flow. Installation was a breeze in my 30" insert. Installation harness was pre-wired, so there was literally no wiring accept two wires on the motor. Blower is also much more quiet than previous blowers that I've had. I think it's due to the ball bearings that these guys use in their motors vs. the sleeve bearings in my older units.

- Murci, 10/1/2011

 5.0 Stars
Top notch service!

What can I say?!? I called on a Sunday. A Sunday!! Terry picked up on the first ring and answered my questions for 15 minutes. I ordered over the phone and the kit arrived in a matter of days. Excellent buying experience. Thanks again!

- Jayden, 11/19/2011

 5.0 Stars
Great service

Picked up this blower kit for my parent's fireplace. Jason answered every one of my questions through email and responded within what seemed like minutes of me sending the email. Haven't seen this level of service from an online retailer before. Breath of fresh air. Great job guys.

- bullish, 12/14/2011

 5.0 Stars
experience with this site...just wow!!

I hardly ever review stuff online. But I feel really compelled to here. First, the "Find your blower here" select boxes made it incredibly easy to find the blower I needed for my fireplace. This was the only site I found that had this sort of helper tool. (googling the fireplace brand/model was no help aside from the fact that it lead me to this site) I ordered the kit, they shipped it the next day and I received it in a few days. Perfect! I'm not the most technical guy when it comes to household stuff. When I opened the box my reaction was like "woah, this isn't going to be easy". Then I watched the video they have on the product page. It explained everything so perfectly! I realized this wasn't going to be that hard. Sure enough, putting in was a breeze. Started the fireplace and it kicked in within a few minutes. (do be patient, it really does need to heat up first) Thank you Terry to you and your company!

-, 1/18/2015

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