The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. The bend allowance describes the length of the neutral axis between the bend lines, or in other words, the arc length of the bend. Therefore, the bend allowance added to the flange lengths is equal to the total flat length.

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The bend deduction, sometimes called the bend compensation, describes how much the outside of the sheet has been stretched. Therefore, the bend deduction equals the difference between the mold line lengths and the total flat length. The mold line lengths are the distances measured to the outside mold line and are equal to the flange lengths plus the setback. The values of the setback, bend allowance, and bend deduction can be calculated from the sheet thickness, bend radius, bend angle, and K-factor.

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Find your perfect radiator with our BTU CalculatorCorrectly calculate your BTU requirements to -. Create warm & inviting rooms. Increase the efficiency of your heating.

Take control of your fuel billsHow Do I Choose The Right Radiator?BTUs are ‘British Thermal Units’, the unit in which radiator efficiency is measured. Factors such as room dimensions, window size and wall material are used to calculate the required outputs of, in order to adequately heat a room.Use our BTU Calculator to determine the heat requirements of your room.

Simply enter the details in the corresponding fields and we’ll show you how many BTUs you need to ensure your space is always warm, cosy and inviting. How do I Calculate the BTUs for my Room?The best way to get an accurate calculation is to enlist the services of a plumber. However, Best Heating's BTU Calculator is a good guide as to what level of BTU and Watt output will efficiently heat your room. Please note: the calculated figure is for the combined heat output of all radiators and/or towel rails in your room (larger rooms may require more than one). What is a BTU?A BTU – or British Thermal Unit – is an approximation of the amount of energy required to heat 1lb (one pound) of water from 39°F to 40°F, and is roughly equal to 1.055 KJoules. Simplified, a single BTU is more or less equal to the amount of heat and/or energy produced by burning a single wooden match from end-to-end.

How Is Your Room’s BTU Requirement Calculated?A room’s BTU requirement is based upon the cubic volume of the space – the height, length and the width of the room multiplied by four (done for you by our calculator) – and what is above, below and besides the room.With this information – and a bit of mathematical prowess - we can then determine the expected heat loss for your room and provide you with a BTU output to heat the space efficiently – by which we mean to a comfortable temperature and at the lowest possible fuel costs to you. Why Is It Important To Calculate The Correct BTU Output?Being sure to make the correct BTU calculation is very important. Selecting a radiator with an insufficient heat output will mean that your room never reaches its optimum temperature.

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Conversely, choosing a radiator with too high a heat output could mean that you spend more than you need to on your heating bills – but one of the great things about radiators is that you can always turn them down if you need to.Please remember, it is also possible to combine radiators to achieve the required BTU level. Many rooms have more than one radiator in them for this very reason.