I have a separate chamber that has all the equipment to be a flowering room, sans the light.
So standard filter+extraction fan combo, pond liner on the floor etc. etc.
Just left out the light and hung up some strings from wall to wall. Voila, my dry chamber
If I ever have the need, all I would have to do to make it a veg or flower chamber is hang up a light.
If you don't have that luxury...
Basically it's the same as grow and veg, really no adequate substitute for a filter+fan combo.
If you can't have a dedicated filter+fan combo, then you are back to what is always the method:
Things like Ona gel, stronger smells in general to mask the weed smell.
A common diy hack/method seems to be an extraction filter and inside the ducting you make a mesh of these pads people use in their dryers. So you let the air flow through that.