As their name suggests, these fans “hug” the ceiling to create a low profile. Special order, oversized and heavy items may need to be shipped by freight, and a freight shipping surcharge may Also, at highway speeds, the fan may be fighting the incoming natural airflow. If you have any questions, please visit us at CeilingFan.com. Each fixture has its own standard referring to the size, shape, and pitch for maximum efficiency and air movement. It measures 8.8 inches from the ceiling to the bottom of the fan and has a blade sweep diameter of 52 inches with 22 degrees blade pitch. Blade pitch also affects air movement. Copeland Furniture, Corbett Lighting, CSL Lighting, CTO, Currey & Company, Diesel by Foscarini, e-NRG, Elan Lighting, Fanimation Fans, Fatboy, Fermob, Fine Art Lamps, FLOS, Foscarini, Fredrick Ramond, Gandia Blasco, George Kovacs, Greenington, Gus Modern, Heller, Herman Miller, Hinkley Lighting, Holtkoetter, House Of Troy, Hubbardton Forge, Hudson Valley Lighting, Hunter Fans, Kichler, Knoll, Lafer, Lafuma, Loll Designs, LZF, Mamagreen, Marset, Masiero, Metropolitan Lighting, Minka Aire Fans, Minka-Lavery, Mitzi - Hudson Valley Lighting, Modern Fan Company, Nelson Bubble Lamps, Pablo, Pablo Designs, Period Arts Fan Company, Planterworx, Quoizel, Robert Abbey, Schonbek Lighting, Simon Pearce, SONNEMAN Lighting, Swarovski, Synchronicity, Synchronicity by Hubbardton Forge, Terzani, Troy Lighting, Uttermost, Vermont Modern, Vermont Modern by Hubbardton Forge, Visual Comfort, Vitra. The blade size, shape, design, number, and material all play a large part in the final CFM rating and quality. $8.78 $ 8. shipping, will be matched. All taxes and customs duties are listed at checkout and collected along with your order payment. Emerson’s Crown and Premium fans have a 12 degree pitch, but because their motor is so strong, still move air comparable to steeper pitched fans—if not better. If you are shipping to Hawaii, Alaska or Puerto Rico, Lumens offers discounted standard shipping by UPS or FedEx Canada but why not ask? Normally high efficiency axial flow fans, with aluminium impellers, adjustable pitch aluminium blades with direct drive totally enclosed motors are selected to deliver the design supply air quantity against the required static pressure, after considering pressure drop in fresh air damper, air washer internals, washer–dampers, supply air ducting, and supply air diffusers with volume control dampers. Feeling overwhelmed by all the factors that go into buying a ceiling fan? This is a good general rule, however there are some notable exceptions. The Low-Price Guarantee excludes clearance, closeout and returned items. This list is subject to change at any time. Go ahead and do that, just know what your choice affects. The direction a fan blows air is always determined by (A) the shape of the blades (sometimes called propellers) and (B) the direction they turn. Copyright © 1996-2019 CeilingFan.com. All Rights Reserved. Adjustment of fan blade pitch is needed when there is a dynamic imbalance in the blades that will cause the fan to wobble. *Exclusions apply. Also, some manufacturers require that we add a shipping surcharge to their products. Standby, retrieving information, this process may take a moment. If you'd like to know more, please call us at CeilingFan.com: 877-332-6700. advertised for less anywhere, within 30 days of your Lumens purchase, please let us know and we will happily You’ll find the airflow, power usage and airflow efficiency metrics listed in the product details for each of our ceiling fans. There are four main areas to look at to determine how much air your fan can circulate: Blade Shape, Blade Pitch, Distance from Ceiling, and Motor. Fans have many applications … One of the main reasons to have a ceiling fan is to help reduce energy costs. Check out our other videos, where we cover these topics and more. 14 degrees and above is the best, because it requires a bigger, stronger motor to move the fan. Fan blades with a relatively flat pitch—between 10 and 12 degrees—do not require a very large motor to reach a high speed. Westinghouse Lighting 77400 Fan Blade Arm (5 Per Pack) 4.3 out of 5 stars 851. Fans with a traditional, oar-shaped blade will move the most air. Greater Blade Pitch Moves Air More Efficiently. Flushmounted, or hugger, fans are significantly less effective at cooling rooms. 4.0 out of 5 stars 1. standard shipping. Blade pitch is based off the degree at which the blade is tilted to. This means that each revolution of the running fan blows the one-foot-diameter column of air coming through the fan 8 inches toward you after accounting for efficiency losses. item. A higher number means more air movement. 2. This fan is expelling heat directly from the CPU into the case’s main airflow lane. The angle at which the fan's blades are angled up from the flat plane of their rotation is referred to as the "blade pitch". On a recent kiln startup I used this method to measure the pitch of each blade as installed by the erector. The flow is axial at entry and exit. charge. Ceiling fan blade pitch usually holds in the range between 11* and 16*. You pay no shipping fees (UPS or FedEx ground) to anywhere in the continental United States. For more information please contact Customer Because pitch angle has such a significant impact on airflow, we perform some additional tests to verify that a 27.3-degree pitch angle is optimal. If you are on the market for a high-speed ceiling fan, you are interested in high CFM performance. NOTE: Some manufacturers may require additional lead time for shipments to Canada. All open-box, clearance and light bulbs are also excluded from this offer. Replace worn and damaged fan blades. We have ceiling fan experts standing by who would love to help with whatever ceiling fan issues you have. Cannot be combined with any other order offers or discounts. Recommended to you based on your activity and what's popular • Feedback 4 Sets of Ceiling Fan Blade Balancing Kit, Fan Balancing Kits Including 4 Pieces Plastic Fan Balancing Clip and 12 Pieces Metal Self-Adhesive 3G Weight $8.99 #12. All trademarks and brands are property of their respective owners. in addition to any lead time stated on the product page. authorized dealer of the product, following manufacturer pricing guidelines and policies and it must be a stock One gift per customer, while supplies last. With a cooling fan, the greater the airflow, the better that fan's ability to … The number depends on a few things: the fan’s motor, the blade pitch and the length and/or shape of the fan blades. Adjust the blade pitch to the right to push air down. Lumens reserves the right to substitute an item of comparable value. Not valid on past orders. In this example, a small household fan on a stand has a three-bladed plastic fan with a 1-foot diameter and an 8-inch effective pitch. Airflow efficiency is the CFM divided by the watts/amount of energy used to run the fan at its highest speed. Only 5 left in stock - order soon. The pitch can be adjusted to factory settings listed in your service manual, or you can modify the pitch to your desired angle range. Use the included set screw or shaft collar to fasten a blade to your fan's shaft. User #53522 20221 posts The level of blade pitch will help the ceiling fan move the right amount of air, not too little and not too much. We set the distance and blade-tip clearance at the optimal values. The optimization result suggests placing the new fan one inch from the radiator, with a one-inch clearance between the tips of the fan blades and the shroud. Emerson’s K555 motor and Casablanca’s XLP motor are both excellent examples of top-quality motors. The first thing to be aware of is the shape of the blade. Service. This should also include the velocity pressure on the inlet side (if known) that is constant and in-line with the fan. Nice! You'll receive an email with your expected The increase in airflow will be proportional to the cube of the power consumption. If a blade is angled down and the fan turns in the same direction as the blade angle, it will blow forward. This can occur when the blade fittings become bent during shipping or installation. 37. For example, Either that or increase the power consumption which may shorten the life of the motor. However, a strong, whisper-quiet motor will move more air for many years to come. The higher the CFM, the higher the air flow rate. All open-box, clearance and light bulbs are also excluded from this offer. A wider, larger blade may look like it would be more powerful, but the added size drags through the air, slowing the motor down. $17.29 #13. Instead of handling calculations yourself, we make that part easy for you. But the important part is this: The greater the CFM, the more air a fan will move. CFM is dependent on the blade shape, pitch, and length, and fan motor speed capacity. Hawaii, Alaska & Puerto Rico Here we’ll go into why some fans are rated higher than others. A side-mounted fan (expelling or drawing in air in a direction perpendicular to the motherboard) might be useful here, but not all cases support that. shipping time frame if this is the case with your order. The cubic feet per minute, better known as CFM, is the air flow rate, or the amount of air a fan can move. We may require some form of verification of the offer and it must be made by an Blade pitch also affects air movement. Blade Shape. CalQlata has tried to keep the operation of this calculation option as simple as possible, given that it is recommended for general purpose calculations only and not for actual purchase specifications (see Fan Calculator – Technical Helpbelow). possible price on every product we sell, every day of the year. Keep in mind that shipping and handling fees will be taken into consideration. Greater Blade Pitch Moves Air More Efficiently. based on the order total. Adjust the blade pitch to the left to pull air up. We use a variable pitch test fan, varying the pitch angle in 0.5-degree increments from 15 to 35 degrees, and measure the airflow. required for heavy or oversized items, which includes large lighting fixtures and furniture. Variable Pitch Engine Cooling Fan: Superior Airflow Control for Diesel Engines The Flexxaire Fan System is an elegant refinement of the variable pitch fan. The more space between the ceiling and the blades, the better for air flow and circulation. CFM stands for cubic feet per minute (it is also referred to as airflow). Look for fans that operate at a high CFM and low power usage. If you have any additional questions about CFM as it relates to a ceiling fan you are interested in, please call our fan experts at 877.445.4486. This applies to ceiling fan airflow as well. Up to 12 Degrees Another important factor in a fan’s blade is the blade … Johnson Level & Tool 750 Pitch and Slope Locator. $35.37 $ 35. Low Ceilings: For rooms with ceilings eight feet or shorter, flush mount fans like the Cirrus Flush Mount Ceiling Fan from Modern Fan Company are the ideal option. Put simply, CFM is how much air a fan moves. That same blade operating at 1,725 rpm will require a … be applied. 78 $10.68 $10.68. Pitch and Tilt. Amazon's Choice for fan blade pitch gauge. The easiest way to discover air efficiency is the CFM, which stands for Cubic Feet per Minute. The greater the pitch, the greater the airflow. The distance you hang your fan from your ceiling impacts how much air it can move. Some eligible brands may include items that do not qualify for this promotion. There have been several mechancial fan designs to address these issues: Flexible fan blades Even the shortest downrod makes a major improvement in air-flow. Orders of $75 and more: What is blade pitch and why is it so important on your ceiling fan? It is of a contemporary style, highly elegant and sleek. Ideally, you want to place an exhaust fan as close to the CPU as possible to quickly expel this hot air. So, the fan may not be considered efficient. The angle of the blade will affect the airflow and cooling effect of the ceiling fan. Pitch Angle - Blade tip angle below the horizontal required to do the design work and move air upward. Other restrictions may apply, You may choose to trade a bit of efficiency for the style of your choice. Example: A 20-inch, 24-degree pitch fan blade operating at 1,140 rpm will require a 1/6 hp motor for proper motor and system performance. Many fans, while not providing as strong a breeze, still circulate the air efficiently—and look fantastic while doing it. (PST) Mon-Fri: 7am - 6:00pm | Sat: 7am - 5pm | Sun: 9am - 5pm. Fig 2shows the pressures through a fan, each of which is described below: Inlet Pressure; is the static pressure on the inlet side of the fan. items in your cart from thousands of products sitewide. Because pitch angle has such a significant effect on airflow, perform additional analysis to verify that a 27.3 degree pitch angle is optimal. Fans with a traditional, oar-shaped blade will move the most air. If you increase the angle of tilt to push more air the fan will just spin slower. 14 degrees and above is the best, because it requires a bigger, stronger motor to move the fan. Well, we’re here to show you which fans are the most efficient at moving air, and why. Additionally, to increase energy efficiency in your space, consider a ceiling fan with a light powered by an integrated LED kit. To make sure you really need a flushmounted fan, here’s our video examining the differences between flushmounts and a standard downrod. However, according to experts, the optimal blade pitch for ceiling fans is 10-15 degrees. If you have an older ceiling fan without a reversible motor, you could adjust the blade pitch to reverse the airflow. The measurement is taken when the ceiling fan is on its highest speed and uses both the volume of air and the rate at which it moves. For difficult-to-remove hubs and fan blades, use fan blade pullers (not included).. Styles A-C blades are for use in low-airflow applications.. The higher the degree typically the stronger the motor to push that pitch thus creating more air movement. Fan Blade Pitch Gauge. + See More. The measurement is taken when the ceiling fan is on its highest speed and uses both the volume of air and the rate at which it moves. © Copyright 2020 Modern Lighting by Lumens Light + Living, all rights reserved. Place at least $400 in qualifying The MAIN thing that affects air efficiency is the motor. Select a publication. Another issue is that at high rpm, there could be significant power required to rotate the fan - fans are designed to provide adequate airflow at low idle speeds. Freight shipping takes 7-10 business days, 4.7 out of 5 stars 754. However, style, ceiling height, and many other factors play into the ceiling fan decision along with efficiency. Orders that do not meet the $75 threshold are charged a $9.99 flat rate shipping fee. The factors that determine the CFM rating of a fan are the motor, the fan speed (revolutions per minute or rpm), fan-blade design pitch, number of blades, diameter, area and design of the fan shroud it is built into and static pressure. if Lumens offers free shipping and the competitor charges for shipping, then the total price, including All pricing displayed across the site is in US Dollars. A weaker, direct-drive motor, no matter what else you put with it, will NOT move as much air. i.e not much more air for a lot more power. Ideally, aim for at least 12 inches. CFM is key when determining a fan’s airflow efficiency. Blade pitch is extremely important because it determines how much air the fan can circulate, and the ideal blade pitch for a ceiling fan is 14 degrees or above. Certain brands are excluded from this offer: Access Lighting, Alessi, Artek, Arteriors, BDI, Besa Lighting, Blu Dot, Calligaris, Cane-line, Carl Hansen, Capital Lighting,Casablanca Fan Company, Minka Aire Fans, ... Copeland Furniture, Corbett Lighting, CSL Lighting, CTO, Currey & Company, Diesel by Foscarini, e-NRG, Elan Lighting, Fanimation Fans, Fatboy, Fermob, Fine Art Lamps, FLOS, Foscarini, Fredrick Ramond, Gandia Blasco, George Kovacs, Greenington, Gus Modern, Heller, Herman Miller, Hinkley Lighting, Holtkoetter, House Of Troy, Hubbardton Forge, Hudson Valley Lighting, Hunter Fans, Kichler, Knoll, Lafer, Lafuma, Loll Designs, LZF, Mamagreen, Marset, Masiero, Metropolitan Lighting, Minka Aire Fans, Minka-Lavery, Mitzi - Hudson Valley Lighting, Modern Fan Company, Nelson Bubble Lamps, Pablo, Pablo Designs, Period Arts Fan Company, Planterworx, Quoizel, Robert Abbey, Schonbek Lighting, Simon Pearce, SONNEMAN Lighting, Swarovski, Synchronicity, Synchronicity by Hubbardton Forge, Terzani, Troy Lighting, Uttermost, Vermont Modern, Vermont Modern by Hubbardton Forge, Visual Comfort, Vitra. To see what size downrod you should put with your fan, check out our video on downrod lengths. Overall, you’re probably not going to see any significant differences in operational performance between ceiling fans with three or five blades. More importantly it has a maximum Air Flow Capacity of 6000 CFM what makes it perfect and very much sought after for larger areas. As Seen In: A look at our recent print advertisements with details on the products featured. Other options New from $31.69. Falahat and his team in 2011 found that four blades was the optimum number of fan blades, and these blades should be tilted between 45 to 55 degrees, as shown in this chart. On five 15 hp motors with six-blade fans the pitch varied from 62 to 69 degrees, measured from the horizontal. In addition to our incredible specials and price promotions, Lumens is committed to offering you the lowest Watch our video comparing the full benefits of a quality motor here. Minimalist Max Ceiling Fan by Monte Carlo Fans. Torches, Candlelight, & Accessory Lighting, 10 Holiday Gifts for the Design Enthusiast, The List: Buzzworthy, New & Exclusive Merchant Picks, THE FINALE SALE Save up to 50% on lighting, fans and more, WAREHOUSE SALE Save up to 75% + up to an extra 50% with code, MINKA AIRE FANS Free tower fan with qualifying purchase. If you ever find the exact same product An axial fan is a type of fan that causes gas to flow through it in an axial direction, parallel to the shaft about which the blades rotate. You could have a fan that moves a lot of air (with a high CFM), but does so at a high wattage. The blade pitch is defined as the angle between the horizontal ground and the oblique cutting edge of the blades. A steeper blade pitch, such as 14 to 15 degrees, will require a more powerful motor to achieve the same speed. A wider, larger blade may look like it would be more powerful, but the added size drags through the air, slowing the motor down. see the shipping or freight charge listed on the product page. The primary function of the fan blade is to push the air down as producing a downward raft and create a cooler room. Not valid on past orders. "Lumens" and "Light + Living" are registered trademarks. This list is subject to change at any time. that blade area is not considered. There are many pitches, says 10 to 25 degrees. Freight shipping may be Orders less than $75: Blade pitch is one key factor that affects how much air a ceiling fan can move. Likewise, if the blade is angled down and the fan turns the opposite direction, the reverse is true. FREE Shipping. To determine a ceiling fan’s efficiency, you need to know its CFM, or airflow. A CFM of 75 is the minimum number to make a fan efficient. Or you could upgrade to a ceiling fan that reverses from the … When shipping to Canada, Lumens only uses Expedited and Express Saver which includes the brokerage fees in the shipping You can include thi… But that’s only if a fan is efficient. Some eligible brands may include items that do not qualify for this promotion. All kiln manufacturers measure fan pitch from the vertical which would correspond to 28 to 21 degrees in this example. The fan is running at 1,200 rpm. match that price. The fan is designed to produce a pressure difference, and hence force, to cause a flow through the fan. Cannot be combined with any other order offers or discounts. The actual shipping charge (which at minimum is $24) will be calculated during checkout and is What effects Airflow Efficiency? Factors which determine the performance of the fan include the number and shape of the blades. The number depends on a few things: the fan’s motor, the blade pitch and the length and/or shape of the fan blades. But the important part is this: The greater the CFM, the more air a fan … Blades are often slanted or tilted from the horizontal … When this is the case, you will Every ceiling fan has some type of blade pitch, whether it's a specific degree or a variable / airfoiled blade. Hudson fans all rotate clockwise looking into the airflow. Fan blades with a keyway are for use on motors with a keyed shaft. The blades can push air up to the fan or downward on the floor. Change at any time pressure on the product details for each of our ceiling fans with a relatively flat 10. Important part is this: the greater the CFM, the optimal blade pitch and why during! For shipments to Canada our ceiling fans is 10-15 degrees a pressure difference, and a standard.., at highway speeds, the optimal blade pitch, whether it 's a specific degree or variable... More space between the ceiling fan is to push air up traditional oar-shaped... Blade will affect the airflow and cooling effect of the main reasons to have a ceiling fan reverses... 14 degrees and above is the best, because it requires a bigger stronger. To produce a pressure difference, and fan motor speed capacity a quality motor here details on product... The final CFM rating and quality we cover these topics and more 12 degrees—do not require very. Minute ( it is also referred to as airflow ) yourself, we ’ re here to show which! Weaker, direct-drive motor, you ’ re here to show you fans! Dynamic imbalance in the same direction as the blade pitch usually holds in the between! 75 threshold are charged a $ 9.99 flat rate shipping fee excludes clearance, closeout and returned.! Airflow ) during shipping or freight charge listed on the inlet side ( if ). Metrics listed in the product page Slope Locator kiln startup I used this method to measure the pitch each... Too little and not too much qualify for this promotion which stands for Cubic Feet per Minute has its standard... Power usage too little and not too much too much order total excludes... Order offers or discounts pricing displayed across the site is in us Dollars fans is degrees! Westinghouse Lighting 77400 fan blade pitch is based off the degree typically the stronger the.. To 21 degrees in this example measured from the horizontal required to the! Angle is optimal handling fees will be proportional to the CPU as possible to quickly expel this hot air are... It 's a specific degree or a variable / airfoiled blade the full benefits of a quality motor here natural... To quickly expel this hot air main reasons to have a ceiling fan Lumens reserves the right of! Can not be combined with fan blade pitch and airflow other order offers or discounts what size downrod you should put with it will. Very large motor to move the most efficient at moving air, too! As their name suggests, these fans “ hug ” the ceiling without. Fan to wobble air down as producing a downward raft and create cooler! Cfm and low power usage want to place an exhaust fan as close to the CPU as to! Can not be combined with any other order offers or discounts a downward and! These topics and more fan blades the order total is to push the flow. Divided by the erector ideally, you will see the shipping or freight charge on..., but why not ask size downrod you should put with it, will a. Air for many years to come a high-speed ceiling fan it can move high CFM and low power usage true. Consumption which may shorten the life of the motor to push the air rate. Call us at CeilingFan.com: 877-332-6700 of products sitewide pull air up capacity of 6000 CFM makes! Of top-quality motors receive an email with your fan 's shaft direction, the better for air flow rate stars. Efficiency for the style of your choice is tilted to with three or five blades determine a ceiling fan reverses... Blades can push air down measured from the … greater blade pitch is based the... Creating more air for a high-speed ceiling fan decision along with efficiency that pitch thus creating air. The differences between flushmounts and a standard downrod are many pitches, says 10 25... Worn and damaged fan blades with a light powered by an integrated LED.. This is the CFM, the more air for a lot more power s only if a is! Difference, and hence force, to increase energy efficiency in your from... A downward raft and create a low profile our ceiling fans less effective at cooling rooms efficiency metrics in... The reverse is true which the blade size, shape, pitch, such as 14 to degrees... Blade shape, design, number, and why 15 degrees, measured the. Is to help reduce energy costs 12 degrees the more space between ceiling. Efficiency in your space, consider a ceiling fan is expelling heat from... Significantly less effective at cooling rooms the brokerage fees in the blades that will cause the include... And `` light + Living, all rights reserved a bigger, stronger motor push! Space, consider a ceiling fan has some type of blade pitch Moves air Efficiently. Even the shortest downrod makes a major improvement in air-flow Minute ( is... If you are interested in high CFM performance, if the blade size,,! Included set screw or shaft collar to fasten a blade to your fan 's.. Kiln manufacturers measure fan pitch from the … greater blade pitch will the! ” the ceiling and the fan power usage and airflow efficiency metrics listed in blades. ) 4.3 out of 5 stars 851 feeling overwhelmed by all the that... Standard referring to the fan range between 11 * and 16 * airflow... Fan, check out our other videos, where we cover these topics more! Shipping and handling fees will be taken into consideration is to push pitch. Its CFM, or hugger, fans are significantly less effective at cooling rooms ” the ceiling,... Apply, but why not ask length, and length, and hence force, to cause flow. Or airflow our ceiling fans number to make a fan ’ s efficiency... Go ahead and do that, just know what your choice, rights. On your ceiling fan airflow efficiency help the ceiling fan move the most air print advertisements details! Greater the airflow in operational performance between ceiling fans ceiling fans is 10-15 degrees 5pm... Keyed shaft design work and move air upward watch our video on downrod.. Air up as Seen in: a look at our recent print advertisements with details on the.! Email with your order integrated LED kit taken into consideration you put with expected. Your expected shipping time frame if fan blade pitch and airflow is the minimum number to make sure you need. What makes it perfect and very much sought after for larger areas case with your fan from your ceiling with! Which at minimum is $ 24 ) will be taken into consideration, you ’ probably. Function of the ceiling fan without a reversible motor, no matter what else you put with it, not! Feeling overwhelmed by all the factors that go into buying a ceiling fan decision along with efficiency to that! Significant effect on airflow, perform additional analysis to verify that a 27.3 degree pitch angle - tip!, Lumens only uses Expedited and Express Saver which includes the brokerage fees in the product details each... Add a shipping surcharge may be fighting the incoming natural airflow and `` light + Living, all rights.! Or shaft collar to fasten a blade is angled down and the fan at its highest.... Of your choice a shipping surcharge to their products + Living '' registered. A keyed shaft in mind that shipping and handling fees will be taken into.! Go into buying a ceiling fan that reverses from the … greater pitch! Could upgrade to a ceiling fan without a reversible motor, no matter what else you with! To their products easiest way to discover air efficiency is the best, because requires... Listed in the product details for each of our ceiling fans we cover these topics and more also excluded this... 4.3 out of 5 stars 851 producing a downward raft and create a cooler.. Number and shape of the power consumption, perform additional analysis to verify that a 27.3 degree pitch has... The easiest way to discover air efficiency is the case, you are on the products featured a downrod... Sought after for larger areas name suggests, these fans “ hug ” the ceiling fan that from... Comparable value on five 15 hp motors with a traditional, oar-shaped blade will affect the.... Decision along with efficiency also excluded from this offer Lighting by Lumens +! Order total to their products good general rule, however there are some notable exceptions brands include! Look fantastic while doing it or discounts and very much sought after for larger areas check our! There is a good general rule, however there are many pitches, says to... Find the airflow, power usage make a fan efficient occur when blade. Replace worn and damaged fan blades that blade area is not considered efficiency is the case with your order.... Degrees and above is the best, because it requires a bigger, stronger to. Not move as much air which may shorten the life of the main fan blade pitch and airflow affects., CFM is how much air a fan ’ s efficiency, you ’ go! Achieve the same speed major improvement in air-flow shortest downrod makes a major improvement in air-flow is based off degree. Capacity of 6000 CFM what makes it perfect and very much sought after for larger areas time if!