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The coefficients make no sense.

Here's a plot of the resulting PLF. PLF should generally be in the [0, 1] range, here it explodes to more than 2200.

The python code I used to plot it

def plf(flow_fraction):
    c1 = 10.553 
    c2 = 3432.2 
    c3 = -1244.2
    c4 = 0.0
    c5 = 0.0
    return (
        c1 + 
        c2*flow_fraction +
        c3 * pow(flow_fraction, 2) +
        c4 * pow(flow_fraction, 3) +
        c5 * pow(flow_fraction, 4)
    )

flow_fractions = np.arange(0, 1.01, 0.05)
plfs = plf(flow_fractions)

fig, ax = plt.subplots(figsize=(8, 4))
ax.plot(flow_fractions, plfs)

The coefficients make no sense.

Here's a plot of the resulting PLF. PLF should generally be in the [0, 1] range, here it explodes to more than 2200.

See the I/O reference: https://bigladdersoftware.com/epx/docs/23-1/input-output-reference/group-fans.html#field-fan-power-coefficient-1

The python code I used to plot it

def plf(flow_fraction):
    c1 = 10.553 
    c2 = 3432.2 
    c3 = -1244.2
    c4 = 0.0
    c5 = 0.0
    return (
        c1 + 
        c2*flow_fraction +
        c3 * pow(flow_fraction, 2) +
        c4 * pow(flow_fraction, 3) +
        c5 * pow(flow_fraction, 4)
    )

flow_fractions = np.arange(0, 1.01, 0.05)
plfs = plf(flow_fractions)

fig, ax = plt.subplots(figsize=(8, 4))
ax.plot(flow_fractions, plfs)