A hello and quick question about airflow in a loft

Greetings fellow herbologists.

I'm coming towards the end of my very first grow (outdoor, UK, Purple Passion from seed) and with luck I'm hoping to have some nice fat sticky buds drying in the loft very soon.

So the attic is dark and it's well sealed and insulated. There's little or no draft. I've obtained a Rhino pro carbon filter which I've attached to a 250w extractor fan that vents out of the roof via the pre-existing bathroom vent (handy). This is where I'm planning to dry the girls.

The question is if the pull of the extractor fan through the filter will be enough to create sufficient airflow?

Should I consider a small rotating fan pointing away from the ladies and bouncing gently onto them? Or is it necessary to have a good source of clean outside air coming into the loft? Another extractor fan working the other way round and pushing air in?

I've got a fan speed controller on the way from Amazon as it seems the 250w fan might do the job just as well at half speed; plausible?

Many thanks for taking the time to read this and apologies if it's been asked before.

Yeah it should suffice. You don't want it to dry too fast anyway. I don't think you would need fans blowing on it. The only concern is if there's any mold up there and if there's any fiberglass insulation exposed which could get glass particles on the buds.

Thanks for the reply. No fibreglass exposed as it's all boarded. Actually tried a loft grow a few years ago - three or four attempts but just couldn't make it work; hence the inside of the roof has a layer of that roll insulation that looks like expanded aluminium(a shiny quilt). That's why there's no draft up there.

Oh - and it's super clean and dry up there - mould most unlikely.

Got an air humidity measurer on the way (not sure what they are called) so I'm aiming to keep an eye on that and the temp too.

Mirwood said:

Thanks for the reply. No fibreglass exposed as it's all boarded. Actually tried a loft grow a few years ago - three or four attempts but just couldn't make it work; hence the inside of the roof has a layout of that sheet insulation that looks like expanded aluminium(a shiny quilt). That's why there's no draft up there.

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Should be fine then. Good luck and watch for little white mold spots.