lol i made BHO with a pvc tube, didnt burn down the house i did do it indoors but considering the size of my tube its understandable now if where talking about zips to preform BHO to well then i would take more proper precaution although i would use PVC it is a very resistant material, your avatar is uninformed, whomever makes mistakes it is probably not because of the matierial they are using but rather mistakes in their methods.
no this thread is obviously a fake most people who would build industrial sized grows have preformed several large grow room ops so they would not need too much advice on how to build the op.