Last year I was growing a single Salvia plant in preparation for extraction. I used the nature's bounty harvest method and yielded about 20g in 2 months. At this point I decided to build grow room in one of my empty bedrooms. I purchased a large LED and built a NFT hydroponic system. 6 months later I yielded 1kg of high grade Salvia leaf. This stuff is REALLY STRONG! I smoked one leaf in three hits and had a full blown out of body experience. I would like to make a 5x or maybe a 10x extract. I plan on using the cold acetone tek with an iso and naphtha wash. I'm just having problems wrapping my head around how to extract such a large quantity. And then, of course, how to evaporate a large amount of acetone. I have another empty bedroom and was thinking of putting the acetone/salvinorin mixture in there to evap with the window open and the curtain drawn. I would also stuff a towel underneath the door and seal the ac vent to avoid vapor escaping into the house. Is this method safe? Can you offer some advice on a more safe method?

You'd be best of asking Gibran2 about this stuff !!

That's the exact person I was hoping would chime in.

The french coffee press with the ice cold acetone works the best, so I just do smaller batches and combine them.

As for evaporation I use my bathroom I have a strong exhaust fan in my bathroom so it sucks the vapor up and blows it outside. I always do Salvia extraction at night as well. Having your acetone evaporate in a room with the blinds drawn might not be enough to adequately protect it from the UV rays. Better safe than sorry, so complete darkness is best. Even when I mix the acetone and the leaf I do it in almost complete darkness just to make sure it's never exposed to any significant light while in solution.

Evaporating large amounts of acetone is going to be tricky if you don't have a proper place which is completely dark and has good ventilation. Why not just do several smaller batches?

I would imagine he's a busy individual , but there's heaps of experienced ppl here in every topic you can imagine and that why this community rocks !!

Gibran2 did a large extraction a couple of years ago but I think it's safe if you close your window and make sure no lights come in and no air from evaporation go in your other rooms. So your plan is good start, you can add a few ventilators in the evaporating room too.
Nice grow room you have !!
Happy extractions and take care.