Choch, thank you VERY VERY VERY much for your replys. Ya man, Im seriously freaking out over here. Very scared.
Ok, you might be onto something with your latest reply.
* So, as far as the negative pressure goes, Im pretty sure Im good on that.
I just performed the smoke test from outside my grow room door, in the hallway. The fan was on in the grow room and at its lowest setting. The smoke did not suck into the room.
But no surprise there, I knew that would happen, because I have a SHITLOAD of whetherstripping AND a blanket type thing under the door. Nothing can get in or out of that door. BUT, the door does resist me a little when the fan is on, and also when the fan is on, its pulling air pretty hard from under the house throught 13 ft of 6" ducting. And I leave the fan on 24/7 . Oh and also from inside the room , when the door is all the way shut, i put my hand on the Can filter and I can actually feel it sucking air.
Now as far as the vent on my ceiling in my grow room for my heat/AC (furnace) that has been shut this whole time. However, I just sealed it with foil tape. So hopefully this will help and not catch fire
and now for my next part.........the reason i say fire is because since its been so friggin cold lately, i have been using the furnace ALOT!!!!!!!! Every morning and sometimes at night. But heres the thing, yesterday I was away from my house for 10 hrs and came back home to the horrible smell in my front yard and I didnt turn the heater on even once yesterday. And also today I only ran the furnace for one hour about 9 am this morning. Its 9pm right now and the smell is just as strong right now as ever.
I hope you or anyone else reading this has some more ideas/thoughts or maybe even have solved it.
And again, I really cant thank you enough, all of you that have replied