Fan Noise cancelling Issue

Hi ADI's

One of my customers is considering developing a fan noise reduction solution.

she wants to reduce fan noise on equipment (air purifier) to reduce noise in work area.

The devices under consideration are planned to be placed next to the already installed equipment.
I think it should be designed in such a way that it receives the fan noise from the side and generates the opposite phase noise.

So I'm trying to design an ADAU1772 ANC part

Question

1. Is the output of the ADAU1772 the opposite phase of the noise signal? Or is it a noise-canceled signal?

2. Is there any other solution available besides the ADAU1772 assuming that I know the noise frequency?

   

Thank you in advance