A fan with 36-inch blades uses approximately 55 watts. And whether your windows or doors are open in the fan room can really start to complicate things (some ways good, some ways bad - and may actually drive an exception to the rule about turning the fan off when leaving the room in the right pressure conditions). Of course, as you state, once the fans get installed in someone's home, there's no guarantee they'll perform at the stated efficiencies. Most of the fans were in the 60 to 75 cfm/watt range. The watt is the unit for the rate of energy consumption. In severe cases, these fans may operate in an unstable manner because of the point of operation on the fan airflow-pressure curve. The result is the cubic feet per minute per watt. The reason is no big mystery; ceiling fan motors use only 10 to 100 watts, depending on size and speed. I don't know what the testing requirements are but I'm sure they include proper installation. The labels on the boxes I looked at all showed a box with three numbers, all specified for the fan running at high speed: the air flow (cfm), the rate of electricity use (watts), and the air flow efficiency (cfm/watt). Leaving a ceiling fan on when nobody is in a room is a waste of energy. Since the CFM is the measure for a fan’s airflow efficiency, the number of blades is more related to embellishing the style for your space. Charles: Great points. Mount a 36" fan 8" from the ceiling (think 'hugger' style) and do the same with a 52" fan. a couple of years ago, and the comments have more info about the Gossamer series. What I'd REALLY like to see is how distance mounted from ceiling affects CFM/watt. $300. That one was about what a waste of energy it is to leave fans running when no one's in the room. Energy Efficient 52 Inch LED Ceiling Fan Next up is a 52-inch ceiling fan from Brightwatts, and this is a budget-friendly unit that comes with an elegant white-finished light fixture. It looked more like an airplane propeller than what we are used to... probably not by coincidence as propellers are engineered to move the most air they can with a given amount of power. 54" Ceiling … It may underline the fact you have many electricity uses ranging from 100-4000 watts, and optimizing the one that rates 34 watts just is not high on the priority list. It looks great but I saw online that their MSRP is around $500! It’s important to note that this is a ratio between the two measurements, not a percentage, so the number may … Your email address will not be published. Martin Holladay wrote a great article about ceiling fans (I'm adding a link to it in the Related Articles list above.) The most energy efficient ceiling fans use less than 60 watts on average and have high airflow. The brand new design and model of this … A fan's efficacy tells you how well it moves air. My constant admonishing to my wife about turning off the ceiling fans when there is no one in the room has gone largely ignored and rejected. The Environmental Protection Agency (EPA) defines efficiency as being the amount of air a ceiling fan moves divided by the cost of operating the fan. Not only is the Slipstream Energy Star Certified, but it produces a high CFM rating of 8,778. From a consumer perspective, it's great to see that fan efficiency is getting measured and labeled. The Cost of Ceiling Fans vs. Air Conditioning: What’s the Difference? It was called the "Gossamer Wind" if I remember. If you're looking for fans at the really high end, you'll probably need to look somewhere other than the big box stores. That Farmington label seems a great example of fans law. This de-stratification can be a good or a bad thing (think about it), but by and large if you are FEELING moving air then you will feel cooler, and especially in summer months that can be a good thing. Electric space heaters typically devour 600 to 1,500 watts per room. Here it is: That's right. Ceiling fans with DC motors use on average less than 1/3 the electricity of a ceiling fan that uses a traditional motor. The one I mentioned in the article that's rated at 106 cfm/watt is one of them. Minka Aire Classica Uni-Pack 54" Ceiling Fan F759-PBL by Minka Aire. The one I saw is the Windward IV made by Hampton Bay. Thanks Allison. You can see this in the label shown above. As they say for cars, your mileage may vary. The HERS standards require the efficiency rating at the medium speed setting. For fans that are less than 49" the note will read "Compare: 36" to 48" ceiling fans have airflow efficiencies ranging from approximately 71 to 86 cubic feet per minute per watt at high speed." This whopper is available in four different finishes but is shown with the ever-popular brushed nickel wet finish. (Fans on porches in the deep South are affectionately called "gnat knockers". © 2020, Energy Vanguard | 533 West Howard Avenue, Suite E, Decatur, GA 30030, Using Ceiling Fans To Keep Cool Without AC, How to Make a High-MERV DIY Portable Air Cleaner, How to Make a Good High-MERV Filter Even Better, 10 Consequences of Keeping Your Home Really Cold in Summer, Ten Years of Building Science Summer Camp, My Duct Systems on Low-Static Mini-Split Air Handlers. That 35 cfm/watt fan was a tiny 24", whereas the 106 cfm/watt fan was 52". Both will move about the same amount of air (neither will move much) while the 52" consumes more power. The current required test procedure (shown left) shows a ceiling fan hanging above a 3 foot tall metal cylinder that is 8 inches wider than the ceiling fan (blade span) and stands 4 feet above the floor. The fan efficiency is the ratio between power transferred to airflow and the power used by the fan. In this blog, I've talked about air flow in duct systems and bath fan air flow, but I've only written one previous article about ceiling fans. Energy Star Ceiling Fans . Has anyone ever paid the same attention to the efficiency numbers for portable fans? TC Feick: You could show her some infrared images to scare her straight if that doesn't work. I've seen many installations where the short 8" rod is used and I could almost guarantee that the fan is not achieving optimal performance. ENERGY STAR certified ceiling fans with lights are 60% more efficient than conventional fan/light units, saving you $120 in energy costs over the fan's 14-year lifetime. This bit of information is telling you what the expected range of efficiency should be … Now you're ready to head off to the store and buy yourself an energy efficient ceiling fan. Energy usage can be a bit confusing because of the whole rate versus cumulative quantity issue. Pros of Ceiling Fans. I too fail to see the logic of spending $500 for a high CFM per watt fan. Allison, Thank you. Special financing – such as with PACE programs – can often help with the upfront cost of installing energy efficient-improvements like ceiling fans. It used to be the case that a five- or six-blade ceiling fan would translate into more efficiency as opposed to a three blade or four blade, but that’s no longer the case. Note that many fan kits come with varying lengths of extender rods. Airflow efficiency is the CFM divided by the watts/amount of energy used to run the fan at its highest speed. The Slipstream has eight all-weather ceiling fan blades and can be placed in wet, damp, or dry locations. Honeywell 50195 Rio Energy Efficient Ceiling Fan With Lights. This makes the fanfare for the $500 super efficient ceiling fan seem positively elitist. A fan with 48-inch blades typically consumes 75 watts, while a 52-inch-blade fan uses 90 watts. You may not have found them because they're sold under the name Windward. Ten years ago when I was building a house and buying a bunch of ceiling fans, it wasn't so easy to figure out which fans were energy efficient and which weren't. How much energy a ceiling fan uses depends on the size of the fan. If you just need a ceiling fan remote by itself, we have those as well. The kilowatt-hour is the unit for the quantity of energy consumed. A few of the boxes had more energy data than the simple box shown above. One of the best ways to save money is to save on utility costs, especially heating expenses. I was in one of the big box home improvement stores yesterday and thought I'd take a look at ceiling fans while I was there. Fans that are oversized for their service requirements do not operate at their best efficiency points. Using the longest downrod that keeps the blades at least 7' above the living space (for safety reasons) will maximize CFM. For example, we could give the efficiency in terms of the rate of air flow per unit time (cfm) divided by the energy use per unit time (watts), which in fact is what we do. Smaller fans take less of a hit than larger fans when mounted too close. This is another one of the fairly priced bladeless ceiling fans, whose … Best Selling – Harbor Breeze Ceiling Fan with Bright Light. Your ceiling fan’s efficiency is measured by dividing the CFMs by the total watts your fan uses. Fans differ from other appliances in that their operating efficiency varies significantly based on how they are applied and where within their operating envelope they are selected. That 35 cfm/watt fan was a tiny 24", whereas the 106 cfm/watt fan was 52". There is no remote with this unit, but instead, you can operate it using the pull-down chains. The wind speed is then converted into CFM (Cubic Feet per Minute). Fans don't cool the space. A 36- or 44-inch diameter fan will cool rooms up to 225 square feet, while fans that are 52 inches or more should be used in larger rooms. They cool people. ), M. Johnson: Yes, the Gossamer Wind fans are sold in the big box stores. Let’s start the ceiling fan vs stand fan discussion by looking at the benefits of … Many fans, while not providing as strong a breeze, still circulate the air efficiently—and look fantastic while doing it. The other ratings are needed in order to calculate the airflow efficiency of a particular ceiling fan. Smart Ceiling Fan. I wonder if those labels on CFM also disclose the conditions under which the fans were tested (is there an NFRC for fans?). I love the term 'gnat knockers.'. Provided the ceiling fan is properly sized for the room in which it is operating, its efficiency of moving air far exceeds that of an air conditioning unit, therefore, for peak efficiency, the air conditioner should be set to a low fan setting and the ceiling fan should be used to circulate the air. Do you remember a few years ago when Florida Solar Energy Center reported on a high efficiency ceiling fan? If you have any questions, please visit us at CeilingFan.com. 5 Reasons Bath Fans Have Such Poor Air Flow, A Bad Duct System Trumps High Efficiency HVAC Equipment, Using Ceiling Fans To Keep Cool Without AC by Martin Holladay at Green Building Advisor. Said box is hardly ever around when a rater does their inspection(s) and even if it happened to be in the trash container the day the rater shows up, it appears from your retail research that the efficiency listed is often the cfm/watt at the highest fan speed. Ceiling fans increase energy efficiency by making people in a room feel cooler, not by cooling the air in a room itself. One factor that affects this number is how big the fan is. They also happened to be the fans that had the ENERGY STAR label. I've been meaning to put up a post on the Haiku ceiling fan by BigAssFans. Energy Star products meet governmental standards for high energy efficiency. ANSI/ASHRAE/IES 90.1-2013 requires fans have a fan-efficiency grade (FEG), as defined in AMCA 205, Energy Efficiency Classification for Fans, of 67 or higher. Today I ameliorate that deficiency as we take a quick look at the energy efficiency labels on ceiling fans. Ceiling fan efficiency can be represented simply as Efficiency = CFM/Watt. Allison, yet another awesome blog post! Ceiling fans with remotes give you complete control over the ceiling fan blades and lights from afar. A CFM of 75 is the minimum number to make a fan efficient. The specifications for ceiling fans are based on the power usage necessary for a specific amount of airflow at different fan speeds. That's not the case anymore because every ceiling fan I looked at had a label on the box that tells you how much air movement you can expect for each watt of electricity you put into the fan. Jeffrey: Great points! However, style, ceiling height, and many other factors play into the ceiling fan decision along with efficiency. Sponsored. The product works … By contrast, central air conditioners gobble 2,000 to 5,000 watts, while room air conditioners consume 600 to 3,000 watts. I look forward to your review. The range of ceiling fan efficiencies that I saw in the store ran from 35 cfm/watt on the low end to 106 cfm/watt at the high end. Larger ceiling fans can move more air than smaller fans. But in a place like Houston when poor people have trouble with AC bills, the official stance of the electric company is they should use fans in place of AC. Unlike, for example, an incandescent lightbulb, a fan that is the least efficient for one application may be the most efficient … Efficiency of any type is generally an output divided by an input. Emergency smoke extraction fans (these may be incorporated in later revisions) Harbor Breeze Ceiling Fan. Ceiling Fan Heater An Efficient, Money-Saving Way to Heat Rooms In a struggling economy, saving money is a key factor to good financial health. By and large a ceiling fan will do two things: increase the flow of air in a given direction, and, largely as a result of the first, de-stratify the air in a room. Most of the fans were in the 60 to 75 cfm/watt range. The higher the number, the more air is moving. We can go with either rates or quantities when we look at energy efficiency of ceiling fans. Tips for Buying Replacement Parts for Ceiling Fans, Minka Aire Ceiling Fans – Our 3 Top-Rated Fans, 5 Factors That Determine Ceiling Fan Airflow. What this means is that for a fan handling standard atmospheric air with a density of 1.2 kg/m3 and a static efficiency of 75% the maximum pressure rise over the fan is 22.5 kPa. Every new ceiling fan being sold in the US these days … I am probably like them, I am pretty particular about ceiling fans in different rooms. Fans should be installed so their blades are no closer than 8 inches from the ceiling and 18 inches from the walls. The fan efficiency is in general independent of the air density and can be expressed as: μf = dp q / P (2) They actually heat the space because the motor gives off heat. If you need more ceiling fan accessories, check out our ceiling fan light kits, ceiling fan light covers and our ceiling fan … Five factors work together to determine the airflow and efficiency of a ceiling fan: blade pitch, blade shape and size, RPM, height from ceiling, and motor size. 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