The best advice is to eradicate noise before recording. Obviously it’s already in the audio here so be aware that in order to remove that air duct noise you will also have an effect on the voice.
All the de-noise and noise print / reduction will analyse the audio and remove the noise totally which will affect frequencies within your voice as well changing the overall quality of the voice.
One thing you could try is to do multiple passes of noise reduction rather than one heavy pass but I fear you’ll find your audio will also be affected by the removal.
Anything thing is to use the healing brush in the spectral frequency view to “paint out” the offending frequencies.
Is it something you could record again or is it essential to repair this audio?