Tyleryou could even put some UV lights up to constantly sterilize your Attic plenum space if it's nothing more than a fresh air cooling station. I like the UV sterilizer lamps and have one on a timer  where my AC blows in before it gets drawn jnto the feuit room (I don't really know what's it doing if anything more than peace of mind)

Ivan Mikic Right on, that sounds good. Id have the attic as clean as possible. Dampers with foam gaskets are working well at my place. Each fan has one, luckily my exhaust are Upwards and out so it somewhat naturally draws out slightly all the time

Is your Attic plenum cooling with fresh air to your incubation & your grow rooms?  My only thought which is just from a stoned stone masonry perspective is attics are wicked hot so might be quite an AC bill and you need fresh outside air into the plenum.  The incubation station might get pretty high in CO2 so you can't cool "that" room and then filter into grow rooms. Maybe exactly like you have it but have the incubation with its own exhaust also?  Someone with real experience will have the answer soon I bet.

I have a plenum that is not super efficient but works because of constant outside air intake,  the AC was on pretty much all the time in the summer and I have a 4" duct with fan blowing,  slowly,  Fresh air. It becomes cool and then the grow room CO2 kicks on.  If I had a lot of stuff intubating I would assume my plenum would be full of CO2. With everything separate it has been Turn Key mushroom growing.  

It is, my kids did some damage to it but I like the agar recipes 

I grew theirs once and it was frigging delicious 

I have.  When I first set this shit up I had not properly added my address to like this thing here and possibly it was once I did that on this internet mushroom page stuff it added my address and the cultures came a knocking.  

Very far out

Erik LomenYeah i can only imagine how hard it was to listen to  that. Lol, ICP that would make so much sense.  Most were pretty much "let's grow mushrooms" the Somerville version. 

But I'm so frigging happy to listen to everything Workman has to say, hopefully more than Hamilton's. I really want to know how they clean their spores

I have way too much to say about mycogeeky podcasts.  Most recently I was shocked willy myco was so "in it to win it$" that he made a how to LSD. I've not seen it, I did see his patreon within 3 days of the podcast go from 3,000ish to like 9,000. That's a lot of bread from a lot of people who are going to be interested in that which is not a good idea to search/try to aquire the ingredients for such brownies.....I mean come on/wtf. Don't get me wrong because I  think every church should replace the little bit of Jesus bread for a solid hit of lsd and then I'd go to church np but to use the mushroom community that is already into Psychedelics to say "Go for it and it's easy af, make your own acid" -all because a video was made in an attempt to sell a month of patreon knowing it's stuff most people could way to fricken easy get in trouble for. Johnny law is no joke and I am glad everyone is just doing what they want and ShouLD with all Psychedelics but many are nieve to what could happen