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What is fd fan api standard?

Updated: 12/18/2022
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Q: What is fd fan api standard?
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Why cant you use a forced draft fan in place of induced draft fan?

It can be used, however not on the same piece of equipment. A forced draft fan is typically much smaller than an induced draft fan. A FD fan moves cooler air into the combustion zone while the ID fan removes the products of combustion from that zone. Typically the volume of gasses the ID Fan needs to remove is from 125% to 200% more than that of the FD fan. example: an FD fan moves 20,000 scfm of air at 100 *F, what size ID fan do you need if the exhaust gasses are 450 *F and the products of combustion and moisture add 3500 cfm to the volume of gasses? PV/T = P'V'/T' with pressure being negligible (it usually isn't) the formula is then : V/T = V'/T' to get the volume needed for the ID fan then: VT'/T = V' V = 20,000 scfm, T = 560 *R (absolute zero scale) and T' = 910 *R 20,000 scfm x 910*R/560*R = 20,000 scfm x 1.625 = 32,500 scfm thus, the ID fan must be sized at least 62.5% larger than the FD fan.