1.2*1.2*2 grow tent
1.2x1.2x2=2.88m3
To keep negative pressure in the tent (thus keeping smell in) you ideally want to replace the air inside the tent 2-4 times a minute. So if we say 4 times per minute in this case.
4x2.88= 11.52m3 to be moved every 60 seconds.
So in an hour you need to move 11.52 x 60(minutes)=
691.2m3
The fans you mention shift 1050m3 per hour. You can run your fan therefore at 70% and still shift more than enough air to keep negative pressure (smell inside). This also helps keep the noise down
Be aware that bends in the ducting and a mismatched carbon filter will change the efficiency of the fan meaning you may have to run it faster to compensate.
Replacing the air twice per minute (still enough for negative pressure)
1.2x1.2x2=2.88
2x2.88= 5.76
5.76x60minutes = 345.6m3/hour
Run the fan at 35% and maintain negative pressure (smell inside) making it even quieter still.
Again Large fans running slower make less noise than small fans running quicker. So basically I would say stick with the 8" and run it slowed down
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