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keebzy
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damn really I was expecting waaaaaaay more thanks for the info!
hey OP i was really worried about electic bill too, i have 2 rooms with 4 1ks in each 30k btu of AC and i live there. bills only around 700. easily worth the payment. BTW a 10 inch vortex and 50 lb filter in each room seems to control the odor good enuff to walk right by the room with the door closed and no smell. Just make sure you flower at night, i tried during the day and can tell you its a bitch on the AC
You can never "over" filter your room. But you can definitely under-filter your room which leads to suspicious smells.
Fans are going to be the loudest part of your grow equipment.
I use a 12" fan + carbon filter in the grow room with a smaller fan + carbon filter outside the door. I move the smaller fan/filter to my harvest area when it's time to cut down.
You're looking for a damper. They sell motorized ones which are either normally open or normally closed.
Regular dampers work, but you'll lose some air flow due to resistance.
I see what you wanna do I don't know if you already meant this when you said 90 degree bends but when running ducting if you wanna get rid of outside light I recomend you use elbows instead of bending the ducting you'd be suprised how much more circulation you will get with elbows. Again if you already meant that then word just throwing it out there..