New Member Join Date Aug 2007 Posts 4. Do a quick conversion: 1 cubic feet/second = 2.4456862334146E-8 cubic miles/hour using the online calculator for metric conversions. You’ll find that a greater CFM will let you be much more productive by pushing a greater quantity of material or debris in half the time of a unit with low CFM. A blower of this sort may have some utility for household purposes – such as cleaning a computer fan. A higher CFM will help you clear a larger area and push leaves further. He worked over 10 years for a well-known global company manufacturing outdoor power equipment, before starting his own landscaping business. His background is IT, but he's always fancied himself as a part-time ship welder, landscaper, and short order cook. Ryan Menezes is a professional writer and blogger. In fact, they are both measure distinctly different things. Use this free online calculator to convert cubic feet per minute to cubic meter per hour. We hope we’ve made a clear delineation for you between CFM and MPH. You’ll find that the value priced models, with a higher CFM, and lower MPH may end up being your better buy — keep reading. In general because every site has different bottoms, sides and contours no single mathematical formula will work for all sites. None of these characteristics alone tell us about the quality of the leaf blower – their combination must be considered. #1 CFM to MPH concept07. A good way to get a general overview of the performance of the leaf blower you are considering is to use the blowing index calculation. cfm or cubic kilometer/hour The SI derived unit for volume flow rate is the cubic meter/second. a manufacturer can easily increase the MPH of a unit by reducing the pipe size. If you are still confused by the difference between the two, consider the following example. var today = new Date(); e.g. cfm to cubic decimeter/hour Even though it is essential to effective leaf blowing, it may be compromised based on the intended application of the device if your budget calls for it. In short, these numbers are a measurement of how much work you can do and how fast. cfm to gallon/minute Submit. As we just stated, the difference is the fact that we are measuring two different things: speed and volume. The force acts upon the surface of wind – in other words, pressure is created. While power is a good indicator of the work generated by the engine, force may be more useful when comparing the ability to move objects. When dealing with wet leaves, a broom might be a better choice. Some leaf blowers have very high CFM ratings. It’s a fantastic budget-friendly leaf blower at less than half the cost of the RedMax, but the tradeoff is that the brand isn’t as well-known. CFM (Cubic feet per minute) The unit of volumetric flow. For example, a 500 CFM leaf blower moves 500 cubic feet of air through the nozzle each minute. Note that rounding errors may occur, so always check the results. e.g. The CFM and MPH are affected by many factors in a backpack leaf blowers design such as: CFM (cubic feet per minute) measures the quantity of air, so it is a direct measurement of how much air is pushed out the leaf blower pipe. If you are considering purchasing a new leaf blower, think about the size of your yard, the price you’re willing to pay, and the other features that are important to you before deciding which one is the best solution for you. No! It’s the pushing power of the CFM, behind the air speed, that determines the actual power of the unit in its ability to push leaves and other debris out of the way. A brief rundown of the leaf blower’s function. MPH is indicative of the radial range (how far does the air travel) of the device. MPH. It measures how fast the air leaves the leaf blower pipe. Purchasing a leaf blower with a high MPH rating doesn’t always mean its stronger. Leaf Blowers - CFM vs MPH. Weigh this with other conveniences like attachments, cords or cordless, Lithium-ion battery powered or NiCad battery powered, portability, unit overall weight and handling, manufacturers warranty and customer support, length of blower nozzle, variable speeds and general maintenance before making a final decision. The unit of velocity (a fancy word for speed) of the wind that is being ejected by the device at any given moment. For the highest MPH, the Craftsman CMEBL7000, with an MPH of 260. 1 CFM equals approximately 0.47 liter per second. Here’s everything you need to know about picking the right leaf blower for your needs. Examples include mm, Be Wary of Manufacturers Specifications. But its not all about power. The specifics of what we consider a high/low MPH and CFM depend on the size of a device and its intended application, yet we can still draw some general conclusions just based on the ratio of the two metrics alone. The force is a constant – it does not depend on the size of the surface. If, for instance, 2,000 cubic feet flow through a duct with a cross-sectional area of 4 square feet each minute: 2,000 / 4 = 500 feet per minute. The CFM is generally around 600-700 and the MPH is around 200. As an example, if you have a cordless air blower with a CFM rating of 90, that means that every minute the blower is in use, 90 cubic feet of air is coming out the end of the blower tube. In science, there are a lot of formula and calculations that we require to apply in our research and study. A good rule of thumb is to purchase the most CFM you can in the budget you can afford. CFM has more to do with power than speed. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. a MPH speed may be given while using a particular attachment – which is a good indication it is artificially inflated. If you own at least an acre, though, you may need between 400 and 700 CFM, depending on how many trees you have, and how quickly you want to clear up that acre.