What is Fan Energy Rating? (Your Cheat Code to Slashing Bills & Not Sweating It)

You are on this page because you have heard the hype about “Fan Energy Rating” and you are possibly asking… “What is Fan Energy Rating?” And is it just another piece of jargon tossed your way, or does it have implications — perhaps for your home, certainly for your wallet and, who knows, the planet? Well, enough with the noise, let’s get right to it.

Fan Energy Rating (FER) is a regulatory standard concocted by the U.S. Department of Energy (DOE) to goose up the energy efficiency of fans in HVAC systems. Consider it a rule book for your furnace’s blower fan, the unsung hero that keeps the warm air flowing around your home. Our neighbors to the north in Canada also had the FER regulations passed by NRCAN.

Why should you care? Because this isn’t just about some government mandate, it’s about ensuring that new HVAC equipment is designed to be more energy efficient, which translates to lower energy bills for you and a smaller carbon footprint for everyone. The DOE estimates that these standards alone will save Americans billions of dollars on their home electric bills, and cut carbon pollution by millions of metric tons cumulatively through 2030. That’s not chump change. As it happens, your furnace’s blower fan is one of the biggest energy hogs in your heating and cooling system. So, making it more efficient? That’s an awesome power play for your bottom line.

How FER (Fan Energy Rating) Works – Decoding Efficiency

So FER is all about efficiency. But what is it actually measuring, and how do they work it out? It’s not voodoo, it’s pretty simple to do.

What FER Measures: The simple truth is that FER is a measure of how effectively a fan can move air versus how much electricity it gobbles up. It’s an overview check, taking into account a fan’s performance on various modes: when it’s generating heat, when it’s creating a cooling sensation and when it’s simply circulating air to freshen things up. The goal is to incentivize energy efficiency and reduce carbon emissions by making clear criteria and minimum airflow requirements available.

How FER Is Expressed and Calculated: The FER is expressed in watts per 1,000 cubic feet per minute (CFM) delivered. When you think of efficiency in general, it’s always output dividing input. For fans, that’s the rate of air flow per unit time (CFM) divided by the energy use per unit time (watts).

For your furnace to meet those FER requirements, it has to be able to move at least 400 cubic feet of air per minute (CFM) per watt of electricity that it uses. This means that your system will run like a highly tuned engine, rather than a big old dinosaur, and the move will help elevate your indoor air quality as well.

And it’s not just a matter of raw power versus airflow. These furnace blowers also have to meet other specifications, such as keeping sound levels to a minimum and meeting a given temperature rise rate. It’s the same as making sure your furnace is not only efficient, but also a cool, silent operator.

The Rule of the Road: Can I Drop You Wherever?

So just when did this whole FER thing start up? Let’s get this straight: The DOE has been releasing furnace fan protocols since 2014. But the actual game-changer, the new rules, were officially put into effect on July 3, 2019. (Our Canadian colleagues had NRCAN pass their FER regs back in 2017 and hit the ground running on that very day too.)

Impact on Manufacturers: This wasn’t a tweak for manufacturers; it was a shake-up. Manufacturers were forced to abandon their older, less efficient Permanent Split Capacitor (PSC) motors and replace them with more advanced Electronically Commutated Motors (ECM). These ECMs are available in constant torque and variable-speed variants.

For such giants as Trane, this often meant having to massively overhaul their furnace lines. They had to do some pretty major efficiency-boosting changes like using more ECM blower motors in all units, running proprietary blower designs the Vortica™ II, bumping up the horsepower on the motors, and in some cases, even reconfiguring the blower housings to be larger.

And here’s the kicker: that change essentially forced those budget-friendly, lower-tier systems that would have previously worked with cheaper PSC motors? Their purchase price went up. Why? Because in order to comply with the new rules, manufacturers had to replace those standard, nonenergy-efficient motors with those more expensive, more energy-efficient models. It’s all the cost of progress, people!

Impact on You, The Homeowner: And now, the burning question: Do you need to rip out your old furnace fan today? Absolutely not. It is not applicable to your system if it was purchased and installed by July 3, 2019. Your blower fan motors you have work just fine where they are.

And here’s a bit of relief: If your older system does need a new motor along the way, PSC motors will continue to be available for both warranty replacements and nonwarranty repairs. Until it’s time to replace the entire furnace, you won’t have to upgrade. But for any new furnace you purchase today? You’re getting the good stuff, the energy-efficient ECM motors. So that’s a win for future savings!

Fan Motors: The Engine Room of Your Furnace

To understand what FER is, you have to be aware of who the players are behind the scenes – namely, the different fan motor types. It’s like choosing a vintage car over a sleek, contemporary electric vehicle. They both get you there, but one does it with considerably more panache (and less petrol).

Permanent Split Capacitor (PSC) Motors:

• The Old Guard: The workhorses of cheaper furnaces for decades.
• One-Trick Pony: PSC motors are usually only capable of running at a single speed. This means they can’t accommodate changes in your system, such as older ductwork or a different air filter.
• Few benefits: They do not provide many indoor air quality (IAQ) advantages and they’re more expensive to operate than its ECM counterparts.
• Not Rebate Friendly: You were looking for some nice utility rebates or incentives, you can forget about it with PSC Motors.
• Tricky Fixes: Fixing these might be a tad bit more complicated since it uses a capacitor, and sometimes that may make troubleshooting a headache.

Electronically Commutated Motors (ECM): These are the smart motors, the motors that give you the most energy-efficient performance and draw less power. A nice bonus? They typically don’t use a capacitor, which makes troubleshooting simpler.

1. Constant Torque Motors:

• Stepping Up: These ECMs offer you 5 defined speeds. That’s a big improvement over the PSC’s single speed.
• Adapting Better: They are much better at adapting to changes in the system, whether it’s your old, dirty ductwork or a new high end air filter.
• Cleaner Air: Like their variable-speed cousins, they do help clean the air in your home, though the precision isn’t quite as sharp due to those fixed settings.
• Rebate Eligible: Can be used for utility rebates or incentives on systems with X13 blower motors, improving system efficiency by up to 1 SEER or HSPF. That’s almost like being rewarded for being smart.

Variable Speed Motors:

• The Best: If by best you mean top performance combined with maximum efficiency, nothing beats that of variable speed motors.
• Smart & + Adaptive:These bad boys can change their RPMs (revolutions per minute) all by themselves. They keep the air volume consistent or adjust up or down to any desired level, which saves you major energy. It’s as if you have a tailor-made flow of air for your house, constantly changing from moment to moment.
• The IAQ Champion: They provide best-in-class, comfort and Indoor Air Quality (IAQ). When the _monds circulate around the centers of the _pies, your filters have ample time to grab particulates. And they’re aces at managing humidity and maintaining consistent temperatures in every room in your house. Hot spots and cold zones be gone!
• Rebate Royalty: Much like constant torque ECMs, these units can sometimes qualify for utility rebates or incentives.
• Brand Power: Companies such as Lennox are fully committed: FER compliant furnaces with variable speed airflow or with the company’s Power Saver™ technology for balanced air temperature and a quiet energy-efficient system.

Here’s a quick rundown of how these motor types stack up:

FER in relation to fan energy efficiency overall

As laser-focused as FER is on residential furnace fans, it’s one piece of a much larger, evolving puzzle in the world of energy-efficient fans. It’s as if you knew the top speed of your car, but you also wanted to know what the mileage was under all driving conditions.

Fan Energy Index (FEI): The Bigger Picture If FER is the “cat’s meow” for your home furnace, then Fan Energy Index (FEI) is next level for all types of fans and HVAC systems (notably commercial ones). Created by AMCA International, FEI is an overall efficiency number that has made a big splash, particularly replacing the older Fan Efficiency Grade (FEG) in codes and standards like ASHRAE 90.1-2022.

What FEI Measures — and How: FEI isn’t all about peak performance; it assesses how energy-efficient a fan system will be in real-world operating conditions. It does, in other words, take into consideration the full fan system, the fan, the motors, the drives and the controls. It is a ratio, taking the actual fan’s efficiency (or its electrical power) and comparing it to a base level, a very theoretical “perfect” fan at a given airflow and pressure point.

When they compute FEI, they do so at a well-defined “duty point” consisting of:

• Airflow Rate (CFM): The volume of air the fan produces. Higher CFM means it’s rated for larger spaces or requires more air flow.
• Pressure Increase (IWG): The amount of pressure the fan is operating at to move the air, also indicates the inches of water gauge (IWG). More pressure means it can combat resistance, such as the ductwork system or filters.
• Air Density: How dense the air is at the time (which varies with temperature and humidity) It takes more juice to move through denser air.
• Fan Speed (RPM): The rotation speed of the fan blades. This affects air flow directly, which in turn also affects pressure, as well as energy usage and noise.

Reading FEI Values: Here’s the cheat code to FEI values:

• FEI Rating of 1.0: This fan meets the high-efficiency industry benchmark. It’s hitting the standard.
• FEI Value above 1.0: The sweet spot. It is more efficient than the reference model fan. It uses less energy to produce the same output, so it’s more cost-effective and environmentally friendly. This is the one you want.
• FEI I Value < 1.0: The fan is inferior to the benchmark. It’s getting the job done, but it’s using more electricity than it should — which is going to cost you more over the long term and have an even greater environmental impact.

DOE has since finalized new test procedures using FEI, and it has mandated the use of FEI ratings in advertisements and on the labels of products from October 31, 2023. So, you’ll be seeing more of this one around.

For engineers and Architects, FEI is evolving as a sort of lode star to design energy-conservative buildings. High FEI rated systems are a game changer for large commercial and multi-family properties with benefits that include:

• Massive energy and cost reductions.
• Superior Indoor Air Quality (IAQ) by killing airborne pollutants and regulating humidity.
• Serious sustainability cred with a lighter impact on the environment.
• Regulation smooth sailing in era of stricter building codes.
• Long-term economic benefits that exceed the initial expenditure: reduced maintenance, greater property value and juicy incentives.

And about incentives: There are FEI incentive programs out there, such as one provided by Xcel Energy, that can help businesses install more efficient ventilation systems and defray the cost. It may be worth inquiring if there’s a similar program with your local utility.

Other Players in the Energy Efficiency Game for HVAC If you understand FER and FEI, and you know what you’re doing when it comes to shopping appliances, you might come across these others in the game of being smart about your energy efficiency:

• AFUE (Annual Fuel Utilization Efficiency): Alright, this one is for your gas furnace. It gauges how well your furnace converts fuel to heat. The higher the AFUE number, the more bang for your buck.
• SEER2 (Seasonal Energy Efficiency Ratio 2) — Like HSPF, SEER2 is used to assign a numerical value to heat pumps and air conditioners by taking into account their entire cooling season performance. Again, greater SEER2 means a more efficient system.
• CFM/W (for Ceiling Fans): For the common ceiling fan. It lets you know the amount of air movement (CFM) you get for each watt of electricity drawn. I’ve personally seen efficiencies ranging from 35 cfm/watt all the way up to a monstrous 106 cfm/watt in stores, and some monstrous large fans reaching all the way up to a mind-boggling 176 cfm/watt. Pro tip: the ceiling fan cools you, not the room. Their motors radiate heat into the space, in fact. And the way that you set them up (the length of extender rods, for example) can really screw with how they actually perform.

Conclusion: The Next Step for Your Energy-Efficient Home

So, what do we know about What is Fan Energy Rating? The FER standards have ushered in a new era, however, and made significantly clear the sort of challenges and the type of engineering that was, and is, going to be necessary to support the level of innovation and value to customers that the marketplace has seen in recent years. It’s made manufacturers adopt ECM motors, which leads to better all around furnace performance, cleaner indoor air, and the possibility of snagging some sweet utility rebates for you.

And as FEI’s rising star walks onto the scene, the spotlight on fan energy efficiency is expanding to include everywhere from every corner to every cranny of commercial and multi-family buildings, not just residential furnaces. In other words, we’re getting a clearer picture, more complete picture of how well fan systems work in the wild.

The bottom line? The relentless push for more efficient fans – whether it is driven by regulations like FER, or a desire to get better test scores with a fan like Max-FEI – is not just box ticking. It is key to building sustainable, future-proof homes and properties, and to slashing the overall environmental punch of our heating and cooling systems. So, next time you’re in the market for new HVAC equipment, keep the Fan Energy Rating in mind – it’s your own personal cheat code to a more efficient, comfortable, and cheaper-to-operate home.

Frequently Asked Questions

Q: If we have FER regs, I will not have to replace my current furnace fan will I? A: No, not at all. If your furnace was set up before July 3, 2019, you’re off the hook. You won’t have to replace your current blower fan motor.

Q: I want to replace some parts for my older furnace, but it has a PSC motor. A: Yes, absolutely. PSC Motors will be available for warranty replacement and non-warranty replacement for furnaces manufactured before July 3, 2019 until the end of their useful life, or until you decide to replace the equipment.

Q: What is the primary distinction between a PSC motor and an ECM motor? A: The main difference is that a PSC motor uses a capacitor but an ECM motor does not. This makes troubleshooting and repair an ECM motor easier and more understandable. ECMs are also typically far more efficient and controllable with the airflow.

Q What is the role of FER in helping me save money on my energy bills? A: FER establishes minimum efficiency standards for furnace fans, which would force manufacturers to revert to energy-efficient motors such as ECMs. They require less power to move the same volume of air, which means lower energy costs for you and few bills for you.

Q: Are there any rebates or incentives for those who purchase a furnace built to FER standards? A: Yes, Furnaces with ECM or Electronically Commuted Motors, including constant torque and variable speed, may be eligible for utility rebates or incentives. It’s definitely worth calling your local utility company and checking what’s available locally.

Q: Is Fan Energy Rating (FER) the equivalent of the Fan Energy Index (FEI)? A: Not quite. FER specifically targets residential furnace fans and gas-packaged units. Fan Energy Index (FEI) is a broader efficiency measure, applied to a more diverse array of fans, and HVAC systems more generally (commercial in particular), and that addresses the fan system holistically, including the motors and controls.

Q: How does a furnace fan impact the indoor air quality (IAQ) of my home? A: More efficient fan motors, especially variable-speed ECMs can do wonders for your Indoor Air Quality (IAQ). By circulating air consistently and evenly, these fans help your home’s filters capture more airborne particles and also help to regulate humidity and temperatures more evenly throughout your home.

So there you have it – the down and dirty on What is Fan Energy Rating, minus the fluff and full of everything you need to know to make wise decisions about your home’s HVAC setup.