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Tent ventilation - Air intake question


New Member
I am a first time grower, I have a 2.5x2.5x5 tent which I put in my walk in closet. I built a wall behind the tent and vent OUT through the wall (so I dont have to listen to the fan) and into my attic. I am using a 4" inline fan and big carbon filter to exhaust. Now I draw air into my tent from a bottom vent which I ran into the floorboards and layed the 4" ducting along the top of the heating ducts from the furnace and am drawing warmer air (helps maintain better temp and humidity in the tent) through a thick furnace filter. My question is, is there any downside to drawing air from here such as air quality / co2 deficiencies / etc.?

All advice is welcome! TIA
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