If you add a new line in your house, you have to calculate the size you need, to supply that room. The size depends on the CFM duct , which means Cubic Feet per Minute, with which provide to the room.
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If given a room with 100 CFM, that means there will be 100 cubic feet of air dispensed into that room every minute. Ducts that are too small will not provide enough air and have an increased rate, which leads to make noise. Those who are too big, have low speed. This leads to a significant drop in temperature before the air reaches the room.
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Calculate the square footage of the room you suministrarás air. Measure the width and length and multiply the numbers. Plans brew 1 CFM per square foot. This amount is usually sufficient to maintain a comfortable room. So if your room is 200 square feet, you'll want 200 CFM.
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Duct Use a calculator to find the correct size. Use one online or manual that you can buy from a dealer HVAC. Using a water column of 0.1 inches per 100 linear feet of duct and friction rate, which is the standard for supply air ducts, and using the example above, you'll see that 200 CFM need an 8-inch duct diameter.
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