Surely this will come as a shock: the room, which has turned out to be more of a tall closet, IS BUILT!
AND the plants have moved in - the celebrations may begin! (And I know the Brits will do us the honour today, even unwittingly haha!)
What can I say!
There was summer! And I was able to get growing in the kitchen cabinet, so the rush only emerged as temps tumbled and the designated companion tomato was starting to suffer from the night frosts.
And there was the realization that there's no point getting all finnicky about wall insulation if I was going to cut a bunch of holes in them anyway for ventilation
So the project was immensely simplified, the green glue + drywall got applied on the other side of the back wall, to insulate my son's room from mine better, and the "room" became a "closet" by virtue of the dimensions (inside final floor space: 75 x 150 cm) and the material - all easy wood.
The frame
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On the right bottom you can see the height of the air intake defined by the squared timber, in case I decide not to use the house intake (entry visible upper left corner of room), or want to supplement, whatever!
Supplementary air intake outside:
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And when inactive (the lid also got 2 fasteners after this to keep it in place)
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As for the internals!
The house air intake got an insulating box built afront of it, from which the ducting I already had is hung to the floor when in use, as you can see here:
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On the right, the air outtake box (which I already know is going to be doubled in length, I can get way more soundproofing of the air noise that way), with a genius double-outlet design.
The larger one is to attach the intake ducting to, so house intake gets channeled through the closet without affecting it. This will be absolutely necessary in summer!
But it won't be a problem, since all I need to do is plug the ducting into the outlet and pronto.

And the other is where the filtered air from the closet goes through
Everything attached - I'm very much in love with the placement of my posh socket strip at 2m height haha
And the new speed controller for the S&P silent 160 fan I now have running is very slick too!
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The ceiling setup - all well out of the way, and giving the closet some airy headspace, which surely will give me a whole new climate to work with (whether that's good or bad, shall be seen haha)
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Note the adjustable light positioning - the wood bar the lights are hung from are sat on a wood strip, and the lights are attached via movable loops. So I can alter light positions depending on what's growing both horizontally and vertically.
The vent is hung from bike tires (the inner hoses? whatever you guys call them lol - also used in the light hangings there, in that case for its anti-slip characteristics) - which is the one thing that really stops vibrational noise transmission, and I can only reccommend!
Oh and yes, that's a 200W 2700°K CFL there, gotta use what I have for now and it was faster than getting out the HPS + transformer. But the light is just sooo inferior, even for the tomato plant, which has now come inside, with a bit of frost damage, but I figure she'll recover quickly
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And the midgets from the cabinet, with only 100W of - visibly more effective - COB lighting for now, expandable to 200W if I feel it's worth it
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Why did I need such a tall closet again? LMAO
But I'm actually relieved to have them in there now, I kept noticing the soil getting rather warm in the cabinet, especially the Northern Lights #5 x Haze (the citron yellow one haha), in only 4L soil, which may be
part of the reason for her being so out of whack.

So even if they stay that small, I think the altered environment will be of great benefit anyway.
And by the time they're done, my old soil will be nicely recycled and ready to get growing
real bushes again!
Cheers!