Controlling the smell

I have heard many ways to control smells but i have not found the best solution. What do you think is the best way to control smell? besides a carbon filter on the exhaust of the fan what else do you use to control smells?
Your help is much appreciated.

Inline ozone generator.

is that something i can run continuously?

Yes but your exhaust air must be vented outdoors. Ozone is bad for you.

Put it after the fan but have plenty of duct after it so it has space / time to do it's thing.

thank you for your help... any specific brand you recommend or use?

Uvonair makes a good inline corona model. Corona models are preferable as they don't have bulbs to replace.