this thread may help...
https://www.icmag.com/ic/showthread.php?t=170931&highlight=Calculating+Room+Volume
Other than this it's quite an aesthetic cab you've done there...really like it...just a touch of green missing
thanks for that link.
*still waiting on the dang seeds its been 3 weeks and a couple days now, getting pretty restless waiting! I could be half way done with the grow by now grrrr.
** working on my heat issue, ive been recycling the hot air. i'm sure ill solve the problem when i make a hole in the floor for the hot air to escape under the house from the closet.