A quiet fan will have a rating of 6 or 7 sones, which is roughly 65 decibels For power, a reference level of 10-12 watts is used The 5 Best Portable Generators (2022 Review) How to install a bathroom vent fan If you're looking to save some money, the best budget option on our list is the LG LW6017R If you're looking to save some money, the best budget option on our list is the LG LW6017R. I have worked as a contractor, sales person, and business owner in the construction industry for over three decades--mostly in home renovations and also as a home builder. That may come in handy when youre figuring out what does Sones means for fans. Most people hear high frequency sound waves better than lower frequencies. Shopping for a new range hood? If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. To find how many decibels are in one sone, plug one into the equation: dB = 33.2*log 10 (1) + 28 = 28 dB. 0000001521 00000 n Loud hoods can be disruptive and may not be ideal if you plan to host guests often at your home. A decibel is a unit of measure of the intensity of sound. AddThis use cookies for handling links to social media. Sones vs. Decibels Here is the Concise Oxford Dictionary definition. 0.000000000001\text { W/m}^2 0.000000000001 W/m2 for air, but you can change this value for another medium. 0000031080 00000 n Our team at Hauslane is ready to help. Do I Have A Heat Pump? We don't save this data. This is the quietest sound that a human ear can register. Sone to Decibel Calculator Sone to Decibel Calculator Easily convert Sones to Decibels using this calculator. B = 10 * log ( I / I0 ) B = 10 log(I /I 0) Where B is the sound intensity decibels I is the sound intensity (W/m^2) I 0 is the reference sound intensity (equal to 10 -12 W/m^2 for ambient noise) a decibel is just a logarithmic measurement of power. Sound pressure level is the physical intensity of a sound. Small bathrooms up to 45 square feet or about 95: 50 CFM is sufficient. They are linear in that 1 sone is twice as loud as .5 sones. What is a Decibel? Set the quantity type and decibel unit. Sone: a unit of subjective loudness, equal to 40 phons. Here are loudness intensities of 1 to 10 Sones sounds: Now, Sones are not as popular a unit of loudness as decibels. We have used the Sones to dB conversion in our article about the best bathroom exhaust fans (you can check it out here). But sones is used quite commonly for household items like bathroom ventilation fans, aka bathroom fans and bathroom exhaust fans. Tankless Water Heater Wire Size Calculator: What Gauge Wire (AWG)? The decibel is a logarithmic ratio of the sound pressure compared to a reference pressure Area of the Room=10 x 15 x 10 =1500 Cub Answer: Decibels are simply a ratiometric value CFM = (1,000 sq ft * 8 ft * 4) / 60 min = 533 ft3/min = 533 CFM A common rule used by HVAC professionals looking to do a fast calculation les 5 doigts de la main gestion de classe; is the armed forces vacation club legitimate; biggest drug bust in the world guyana; sone to decibel calculator. Example: convert 15 B to dB: 15 B = 15 10 dB = 150 dB. The "A" scale is noise within human hearing range. The decibel meter uses the sensitivity of the microphone and converts the electrical signal accurately to sound pressure, and shows the resulting level of sound pressure (decibels dB). The sone rating is often determined by the size of the fan and the motor. However, if you cook a lot of greasy, fried, or Asian food or simply cook often invest in a 900+ CFM range hood. Or, as in the case of amplifiers, the maximum sound pressure it can emit. This calculator can be used to find out the Power Gain and Voltage Gain from the Decibel value. SEER = (1 EER100% + 42 EER75% + 45 EER50% + 12 EER25%)/100, Total Heat (BTU/hr.) 0.000000000001 W/m 2. Large bathrooms Over 80 square feet: 100 CFM to 150 CFM fans are recommended. Decibels dont increase at a linear level. This formula works as long as you have spherical wavefronts. They developed the Fletcher Munson curves that have been improved upon, but are still in use today. Installing a range hood improperly can affect its performance and noise level. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Note! The noise level from the fan in decibel can be calculated as, The difference in decibel between sound intensity 10-8 W/m2 and sound intensity 10-4 W/m2 (10000 units) can be calculated as, L = 10 log ((10-4 W/m2) / (10-12 W/m2)) - 10 log ((10-8 W/m2) / (10-12 W/m2)), Increasing the sound intensity by a factor of. The decibel is a logarithmic unit used to describe the ratio of a signal level - like power or intensity - to a reference level. If you want to clean your air quickly, place the fan on the highest setting. Low frequency hearing loss is much more rare. Range Hoods, What You Need to Know about CFM and Its Accuracy Before You Buy a Range Hood, Everything You Need to Know About Sones Rating for Range Hoods. In this article, well explain exactly what a Sones noise rating means, why it matters, and factors that affect the rating. In contrast, decibels are measured on a logarithmic scale. Reach out to us today to get started. Tightening these items will limit vibration noises like rattling or knocking. To help everybody out, we have designed a calculator that uses this Sones to dB formula to calculate dB from Sones. Most sound levels for equipment such as lawn mowers or compressors are given in decibels. Sones used as sound measurement of audio equipment is usually only informative. However, if your bathroom is near bedrooms with light sleepers that are easily woken up, then having the quietest bathroom exhaust fan might be preferred. Leave empty space, if some frequency data (ex. CUSTOM ART FOR CUSTOM NEEDS. The duct is hidden inside the cabinet, which serves as a noise barrier. If you select a range hood with a large motor and multi-speed setting, you can strike the right balance. Search: Sone To Decibel Calculator. But sones is used quite commonly for household items like bathroom ventilation fans, aka bathroom fans and bathroom exhaust fans. It's simple and easy to convert sones to dB and vice versa. The sone scale is linear, so no matter the frequency or level, 2 sones is twice as loud as 1 sone, and 4 sones is twice as loud as 2 sones. Is it crooked, allowing the fan blades to hit it? You can use this Sones to decibels calculator to convert any number of Sones to dB. Although decibels are generally used to measure this. The closest you can get is to use a decibel meter to get a reading, then convert decibels to sones. Figure 2 is generated based on these assumptions. A sone is defined as a unit of sound or loudness. Decibel (Loudness) Comparison Chart Here are some interesting numbers, collected from a variety of sources, that help one to understand the volume levels of various sources and how they can affect our hearing. Phon: a unit of the perceived loudness of sounds. It is about as loud as a face to face conversation using a normal indoor voice. It can be extrapolated by using measurements in decibels or pascals. You Are Here: will my player transfer to 2k22 next gen texas roadhouse call ahead seating rules sone to decibel calculator. Your friends and family can then enjoy the comfort of your kitchen and socialize. That means for larger values than '1 sone is equal to 4. But when a measurement of noise level is expressed in sones, we might be a little confused. If human beings are exposed to loud noises for a brief period, it doesn't cause . Make sure it is the right size for the fan. Decibels, however, are a bit hard to imagine. If the whisper is 30 dB, the measure is 60 dB for everyday conversation, and the motorcycle motor is running 95 dB. Noise Criterion (NC) - Free Online Calculator. Remote blowers, also called inline blowers, work well, as these motors are installed within your chimney. The sound pressure level is simply another way to describe decibels. Calculating decibels is typically a process of converting a sound intensity in one unit to another. 1.0 sones = 28 decibels Sound of a whisper 2.0 sones = 38 decibels Sound of a babbling brook 3.0 sones = 44 decibels Sound of bird calls (not crows) 4.0 sones = 48 decibels Sound of a refrigerator 5.0 sones = 51 decibels Sound of a refrigerator 6.0 sones = 54 decibels Sound of a refrigerator 7.0 sones = 56 decibels Sound of normal conversation For example, about a 10 dB increase doubles loudness. Please see Room Loudness Sones Reference Chart at engineersedge.com. On top of that, we have solved 3 examples of how to convert Sones to dB, namely: Before we look at the Sones to dB calculator, chart, and the examples, lets explain what Sones actually are, where they come from, and why we dont just use decibels for measuring sound: Decibels are our standard unit of measuring sound. 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Copyright 2014-2023, PICKHVAC All Rights Reserved. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! 0000002137 00000 n CFM This is the cubic feet per minute the fan moves through it. This is roughly the appropriate range of sound level for your range hood. Sound levels are generally expressed in decibels, which are logarithmic and so cannot be manipulated without being converted back to a linear scale. In other words, a sound that delivers over four sones is about four times louder than the normal reference level. Sound Level Comparison Chart and the Ratios, Subjectively perceived loudness (volume), Calculator + Chart (Natural Gas), Average Gas Bill For 1-Bedroom Apartment: State-By-State Cost Analysis, Average Electricity Bill For 4 Person Household (Survey Analysis), How Many kWh Per Day Is Normal? One sone is equal to about 1,000 Hz with a sound level about 40 decibels above a normal reference level. 2.0 to 3.0 sones provides a fair amount of white noise that makes bathroom use more comfortable for some family and guests. A dB has no assigned value; it does not represent a definite quantity of anything; it is simply a ratio used to compare the relative intensities of two sound waves, or the relative power levels of two sound sources. The sound intensity level (SIL), also called acoustic intensity level, is the absolute logarithmic unit of the sound intensity relative to a reference value of 10 W/m human hearing threshold in the air. For quick and easy to use information use the charts you will find on this page to get a good comparison between sones and decibels. This is a sound we can hear quite easily. We may or may not be compensated for purchased you make as a result of our recommendation. As you might imagine, the methods used for each of these standards can produce different results. Sound Reduction Index Calculator Decibel Formula The following formula is used to calculate the total number of decibels from the sound intensity level. Energy quantity x is field quantity y (amplitude rms) squared: x ~ y2. https://hauslane.com/blogs/news/everything-you-need-to-know-about-sones-rating-for-range-hoods To calculate SIL from the sound intensity, use the sound intensity level section: Enter the reference sound intensity value. 1). I will start with the quietest bathroom fan on the market today. Enter the sound intensity (W/m^2) into the calculator to determine the sound intensity in decibels. Sone levels are lowest when your hood is set to the lowest speed and get louder incrementally with each speed. Loud noise above 120 dB can immediately damage your hearing. 1 Sone is a sound of an average refrigerator. Consequently, the sone scale of loudness is based on data obtained from subjects who were asked to judge the loudness of pure tones and noise. There are three types of blowers: local, remote, and external. Range Hood CFM for Electric vs. Gas Cooktops. Generally speaking, the larger the size of the duct, the quieter the operation. Loudness perception - sound pressure effect - sound intensity cause. Range hood fans are not as quiet as bathroom fans. They tend to be more powerful and typically emit between 3.0 and 7.0 sones. 0000001316 00000 n blue doberman puppies. Example: A 90 phon tone is equally as loud as a 1000 Hertz tone at 90 decibels. Replace the fan. Straighten it and tighten it, if possible. If these tips for how to make a bathroom fan quieter dont work, then replacing the bathroom fan might be your only option. When installing a vent hood in your home, youll probably want a quieter hood. A bigger exhaust opening helps to reduce the noise generated by air inside the range hood and air exiting the house. The following YouTube video produced by Siemens will help introduce you to loudness and sones. Some of our calculators and applications let you save application data to your local computer. The threshold of human hearing, also called the auditory threshold, is widely accepted to be 0 dB. For more information, please see Siemens Sound Quality Metrics: Loudness and Sones. To convert Sones to dB, we use the following equation: Dont worry; you wont have to use it. High frequency sounds are usually over 2000 Hertz like whistles and finger nails on a chalkboard. ($0.05 $0.22/h), How Much Does 1000 Watts Cost Per Hour? Eleven decibels to 48 decibels. 6). A simplified explanation is the 3 Decibel Rule. Sones are measured on a linear scale, like inches or centimeters. We recommend the following: first, think about the max amount of noise that you would be comfortable with. 5). Low frequency range. The decibel scale and the intensity values it is based on is an objective measure of a sound. And the list goes on. Autor de la entrada Por ; Fecha de la entrada alcorn state basketball coach; john foerstel designated survivor . Some of our calculators and applications let you save application data to your local computer. The formula for converting decibels to sones is: If your math skills are as rusty as mine, using these formulas may be a little tough. They are further away from the front of the hood than local blowers, which are installed inside your hood. It makes for better comparison shopping. Loudness is measured in decibels, right? Maybe something with acoustics. Decibels to watts, volts, hertz, pascal conversion calculator Convert dB, dBm, dBW, dBV, dBmV, dBV, dBu, dBA, dBHz, dBSPL, dBA to watts, volts, ampers, hertz, sound pressure. At 1.5 sones, it is the quietest and most affordable . This size is usually 0.5 to 1.5 sones depending on the model. White lithium grease is another useful product to quiet noisy bathroom fan squeaks and squawks. The right range hood noise rating depends on your preferences and cooking style. Sones Decibels (dB) 1 Sone: 28.00 dB: 1.5 Sones: 33.85 dB: 2 Sones: 37.99 dB: 2.5 Sones: 41.21 dB: 3 Sones: 43.84 dB: 3.5 Sones: 46.06 dB: 4 Sones: 47.99 dB: 4.5 Sones: 49.69 dB: How Much Does 500 Watts Cost Per Hour? Press 'Tab' on keyboard to move next space. You will get the result: 18.005804143955825 dB. The sone is a unit of volume. - the decibel value of a signal increases with 3 dB if the signal is doubled (L = 10 log (2) = 3). If you know what a sone represents in the real world (See chart below. The Loudness Unit: Phons and Sones. Use the following formula to convert . The maximum sound level of your vent hood is not very loud: the sound of traffic noise. Keep reading for more information on sone level and be sure to check out the video below. We set it to. To find how many decibels are in one sone, plug one into the equation: dB = 33.2*log 10 (1) + 28 = 28 dB If you have decibels and want to find the number of sones, use this equation: Sones = 10 ( (db-28)/33.2) These equations may look daunting which is why we made calculation easy for you. The sound power in decibel from a source with the lowest sound hearable can be calculated as, 100 W is almost the highest sound power possible to hear. The lower the sone value, the quieter the hood. How much is 0.3 Sone in decibels? Range hoods with larger motors will have stronger suction power and generally produce more noise. As mentioned before, sones are a subjective perception of sound pressure. Use left/right arrows to navigate the slideshow or swipe left/right if using a mobile device, find the right model for your cooking needs, 4 Reasons You Should Upgrade Your Kitchen Range Hood, How to Install the UC-PS38 Range Hood with Matt Weber of Home Improvement and Repairs, 3 Hauslane Range Hoods Make Forbes Homes 10 Best Under Cabinet Range Hoods of February 2023 List, The Benefits of Using Charcoal Filters for Ductless Range Hoods and How to Install them, How to Keep Your Home Safe from Gas Leaks, DIY Guide to Removing Your Over-the-Range Microwave and Installing an Under-the-Cabinet Range Hood, How to Keep Your Kitchen Air Clean for Your Health, How To Get Rid of Cooking Smells From Your Kitchen. For example, if youd like to chat with friends while cooking, run the range hood at the lowest setting. sone to decibel calculator. The absolute means it can be easily converted into the sound level and vice versa. Noise generated above 70 dB over time can begin to affect your hearing negatively. 2 sones are twice as loud as 1 sone and 4 sones are twice as loud as 2 sones. air), Sensible Heat (BTU/hr) = 1.1 x CFM x t (std. At 40 dB, it would seem like a quite office. As an Amazon Associate we earn from qualifying purchases. These applications will - due to browser restrictions - send data between your browser and our server. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! If the device you are buying has a sone rating, it should also tell you which standards association it is using. Tankless Water Heater Breaker Size Calculator: What Size Breaker? Search: Sone To Decibel Calculator. Keep in mind that the calculation is approximate since there is no exact way to calculate decibels from sones. Although the sone is a measure of perceived sound, and cannot be measured with a meter or gauge, engineers and designers continue to use it as a reference. HVAC System Costs 2023 Replacement and New, York HVAC Age: Serial Number Decoding for AC, Furnace & Heat Pump, Rheem HVAC Age: Serial Number Decoding for AC, Furnace, Air Handlers & Heat Pump, Payne HVAC Age: Serial Number Decoding for AC, Furnace & Heat Pump, Bryant HVAC Age: Serial Number Decoding for AC, Furnace & Heat Pump, Amana HVAC Age: Serial Number Decoding for AC, Furnace & Heat Pump, Goodman HVAC Age: Serial Number Decoding for AC, Furnace & Heat Pump, Carrier HVAC Age: Serial Number Breakdown for AC, Furnace & Heat Pump, Trane HVAC Age: Serial Number Decoding for AC, Furnace & Heat Pump, Lennox HVAC Age: Serial Number Decoding for AC, Furnace & Heat Pump. Note how much difference there is between decibels at lower sone ratings, and how close the decibels are at higher sone ratings. %PDF-1.3 % sone to decibel calculatorno credit check homes for rent in tucker, ga. at Edisto Beach. Sound waves move our eardrums (tympanic membranes). They will turn off the appliance after a set amount of time. facetime call on chromebook; As you can see, most new range hoods and bath fans are fairly quiet. If the 1 KHZ frequency is varied, it becomes necessary to re-calibrate the phons and sone numbers. The phon is also a unit of subjective sound loudness, but the phon is more closely related to the decibel. Almost every range hood and bathroom fan mentions its sone rating. This keeps the sound produced from your blower at bay. Menu and widgets. Use the following formula to convert . For best results, have the appliance professionally installed to ensure proper venting. The better ones have a noise range between 0.3 and 4.0 sones. What To Do if Your Kitchen Doesn't Have a Vent. The decibel level of a signal can be expressed as, L = 10 log (S / Sref) (1), S = signal - intensity or power level (signal unit), Sref = reference signal - intensity or power level (signal unit). How Sones Compare To Decibels? H\Tx3!/lPf! iI6`!d . Loudness level can be expressed in sones or phons, which are both units of loudness. The perceived loudness of sounds is decided by panels of people with normal hearing. Sones are basically loudness units that express the perceived loudness of sounds; how loud we perceive some noise. It is also widely used in electronics, signals and communication. But 2 sounds that have equal intensity do not necessarily have equal loudness. One sone is arbitrarily set equal to the loudness of a 1,000-hertztone at a sound level of 40 decibels above the standard reference level (i.e., the minimum audible threshold). 0000000790 00000 n The signal units depends on the nature of the signal - can be W for power. (std. Use the slider and slide it to 0.5. 0000033757 00000 n Decibel Addition and Subtraction. A lot of these tips for making a bathroom fan quieter start with removing the cover. We have 3 children and 4 granddaughters. This is the noise level of a rocket ship . 3 Sones To dB (Example 3) You can use this same procedure to convert Sones to dB for any number of Sones. But lets be honest many homeowners want their fan to be a little louder to drown out bathroom noises, right? Average 1-6 Person Home kWh Usage, Gas Vs Electric Water Heater Monthly Cost Comparison (State-By-State), Water Heating Costs For 1,2,3,4,5,6 Family Homes (State-By-State Analysis), Electric Water Heating Cost, kWh Usage Per Month (State-By-State RECS Analysis), What Is W2 Wire On Thermostat? We explain to them that Sones are a unit of loudness and they can be converted to decibels. 4. Perceived loudness is a psycho-acoustic quantity that depends on sound pressure level, the frequency spectrum, and the time behavior of the sound in question. Purchasing quiet range hoods and bathroom fans is way easier if you know how much noise each unit makes. Cookies are only used in the browser to improve user experience. Range hoods typically produce between three and seven sones depending on their power, as measured in cubic feet per minute or CFM. He holds an HVAC associate degree from Lone Star College and EPA & R-410A Certifications. But what does that mean in decibels? endstream endobj 26 0 obj << /Filter /FlateDecode /Length 14850 /Length1 30832 >> stream Adding (combining) levels of equal loud sound sources. This indicates how much air the fan can move in one minute. 8). The ratio may be power, sound pressure, voltage or intensity or several other things. Sones follow a linear scale, that is, 10 sones are twice as loud as 5 sones. Heres How to Remove It Fast. What Does a Bathroom Exhaust Fan Do and Do You Need One? Range hoods with a delay shut-off feature can also help. Bosque de Palabras Hathaspace Smart True HEPA Air Purifier Reviews, 4+6 Best Whole-House Dehumidifiers (Ducted, Portable), 4 Quietest Dehumidifiers (Best Bedroom Dehumidifiers): 52.1 dB Or Lower. This will NEVER affect our opinion of a product or service! The phon scale sticks to the dB level of a 1 kHz tone, even for sounds quieter than 40 dB. Increasing loudness by 10 phon increases loudness in sone by a factor of 2. Power Gain (P1/P2): OR Voltage Gain (V1/V2): Output Decibels: dB Definition of dB Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Make sure to check the type of installation and if it works with your kitchen. We have designed a Sones to dB calculator (found below) that automatically converts any amount of Sones to decibels. In some ways sone noise levels are easier to understand then decibel levels. 0000002176 00000 n High levels of noise can cause unnecessary stress. You can also select a range hood with an external motor system. We would like to answer how many dB is 1.5 Sones. Which is why you see the sound curves in the chart above. Quiet bathroom fans make as much noise as normal breathing or whispering from a few feet away. Some hoods are loud. Aircraft takeoff, trains, and quite loudly concerts would fall to the 110+ decibel level. If you are sure it is the fan motor thats making a racket, youre handy and know how to safely work on electrical appliances then consider fan motor replacement. 1 dB = 0.1 B. Formula used by the above calculator i2/i1=(d1/d2) 2 L=10*Log(i2/i1) where L is the difference in sound levels (L1-L2) in dB (or dBA). The sound power in decibel from a source with the highest possible to hear sound power can be calculated as L = 10 log ((100 W) / (10-12 W)) = 140 dB Example - Sound Power from a Fan A fan creates 1 W of sound power. This means that 0.3 Sone is equal to 10.64 dB. Use a thick-fabric shower curtain. Click the Convert button, and the missing value will be filled in. About Us | Contact Us | Privacy Policy| Cookie Policy| Terms of Use| Do Not Sell My Info. Loudness is a subjectivecharacteristicof a sound (as opposed to the sound-pressure level indecibels, which is objective and directly measurable). air), Latent Heat (BTU/hr) = 0.69 x CFM x gr. If the decibel value and reference level are known the absolute signal level can be calculated by transforming (1) to, S = Sref 10(L / 10) (2), S - signal- intensity or power level (signal unit), Sref - reference signal - intensity or power level (signal unit). A product called Sorbothane is a peel-and-stick 3M acoustic and vibration damping foam that is very useful for this purpose. For reference, 1 sone is much louder than 0 dB, at 28 dB, according to the sones to dba chart. These curves are equal loudness contours where every sound on each line will have the same perceived loudness. Sound level (dB) decreases as the distance from the sound source increases so any measurement of sound level is meaningless unless you specify the distance at which the measurement was taken. But have you given any thought to the noise level of your new appliance? air). For example: a 10 decibel sound (tone) at 50 Hertz is inaudible to humans, but the same 10 decibel tone at 5000 Hertz is clearly audible. The most common measurement for sound pressure is decibels, but it can also be measured in sones. - free apps for offline use on mobile devices. Just enter the Decibel value and leave Power Gain & Voltage Gain blank, and then hit the Calculate button. Since decibels are a measure of the difference of sound pressures, a reference sound pressure must be given. While design, size, and power are all important, an overlooked aspect of your hood is noise level. Sones are measured on a linear scale. ), Pros & Cons: OTR Microwaves With Exhaust Fans vs. Loudness, or the strength of a sound, is measured in decibels. This unit provides accurate information on the amount of sound the blower produces inside the vent hood. Sones represent perceived loudness of sound which includes sound wave frequency as measured in Hertz. If you have access to the attic, locate the duct running from the exhaust fan to the exterior wall of the attic. The noise level of these bathroom fans is 1.0 to 3.0 for most models. A decibel is one-tenth of a Bel - named after Alexander Graham Bell, the inventor of the telephone. Both sones and decibels are measurements of sound pressure. B level d. BA phon phone volume intensity calculator d. B d. Ba and Sone relate fan theory noise rating sound volume psychoacoustics translate loudness level phon definition loudness in sone ratio how measure sone Conversion valid between 4. Range hoods typically produce between 3 and 7 sones of sound. Here is a helpful equation to convert sones to decibels: To find how many decibels are in one sone, plug one into the equation: If you have decibels and want to find the number of sones, use this equation: These equations may look daunting which is why we made calculation easy for you. An external or remote blower is the best option to reduce the sound level of your kitchen fan. If a 125 Hertz tone is 47 phons, it is as loud as a 1000 Hertz tone at 47 decibels.
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