Venting my grow room.

I'm in the process of setting up a small grow room. I have 2 options in which I can grow. in the upstairs of my house, I have 2 bedrooms, and 1 bath. In the hallway at the top of the stairs there is a closet that I've taken into consideration. My concern is, how could I setup some way of venting this room? also, bringing air in? My other option would to be to grow in a closet that is in the master bedroom. The closet runs along side of the room, so it's the length of the room. I've thought about growing in here, but I don't know what I'd need to do for venting? this is the only area in growing which I'm worried about.

i use a closet that runs along my whole wall too if ya have an attic above easier to cut through drywall in caeiling to make vent if not the next is to use the floor to vent to the basement youll have to run the ducting tword the top of your room in that case i personally would not vent into another room of the house but if you doo just make a vent hole in the walls my hps is hot and vents to my basement to lower the heat signature and my room vents to the attic never really too hot of air going up there fan kicks on when the temps raise a degree or 2 bring in fresh a/c from my bedroom

I would put it in the closet in the spare bedroom. I actually just bought a 3x3 growtent and put it in my closet in a spare bedroom. I cut out a 4in hole in the ceiling and installed a vent portal with a back draft damper so i can blow the air into the attic, but when the fan is turned off. no air from the attic comes back down into my growtent. To get air into the closet I cut a hole that was like 6in x 10in from the inside of my closet to the outside of my closet in the spare bedroom and installed a square vent that are used in your ceilings or the side of walls. so it will be stealth.