Exhaust location opinions requested

[Redoctober]

I'm attempting to set up a fan/filter exhaust in my grow room and I have a few options that I'm juggling. I'm not into doing any major construction e.g. cutting holes in the side of my house, floors, ceiling.

Option 1: There are a set of two windows in the room that are currently covered with light proof plastic drop cloth. The windows overlook the back yard of my house and are obscured by a large pine tree. The windows are on the first floor, but the way the house is constructed, the porch ends and the windows are about 3 feet further over, and relatively high up so for all intents and purposes, they are like second floor windows. The back yard is pretty spacious and I am about 30 yards from my nearest neighbor. There are gardeners that come to do the lawn and stuff about once a week (they take care of everyone on my street). That would be my only concern, but I'm not terribly worried about them, especially if the carbon filter does its job properly. I'd just have to figure out a way to camouflage the duct, with either a dryer vent type setup or maybe the empty shell of an air conditioner. I'll admit that constructing something airtight in the window sounds difficult. I haven't seen anyone elses method for this either.

Option 2: Cut a hole in the door to the room and exhaust the air back into the house. With this method, I wouldn't worry about smell escaping unnoticed or conspicuous venting of hot air, but on the the other hand, I'd be pumping hot air back into the house which would raise my ac usage in the summer. Also I'd have to deal with the hole in the door somehow if anyone came into the house, and that might mean shutting the fan off, which wouldn't work for any length of time.

Option 3: Exhaust into the central air duct that's built into the room. I guess the downside is that if my air conditioning is on in the summer, I'd be counteracting it by pumping hot air into the same duct where the cool air is flowing throughout the house. Also I was going to use this as a passive intake and a perfect vector for cool, fresh air to flow into the room. I'd need to figure out another intake method if I used it as an exhaust. Air from outside is no good because in the summer it's too hot, and winter it's way too cold. I don't know how big an intake needs to be? Would there be enough air flowing underneath the crack between the door and floor to replace the air being blown out? Or does an intake need to be bigger?

What do you think is my best bet? This has been gnawing at me for a solid month.

 

[WeeGogs]

I'm attempting to set up a fan/filter exhaust in my grow room and I have a few options that I'm juggling. I'm not into doing any major construction e.g. cutting holes in the side of my house, floors, ceiling.

Option 1: There are a set of two windows in the room that are currently covered with light proof plastic drop cloth. The windows overlook the back yard of my house and are obscured by a large pine tree. The windows are on the first floor, but the way the house is constructed, the porch ends and the windows are about 3 feet further over, and relatively high up so for all intents and purposes, they are like second floor windows. The back yard is pretty spacious and I am about 30 yards from my nearest neighbor. There are gardeners that come to do the lawn and stuff about once a week (they take care of everyone on my street). That would be my only concern, but I'm not terribly worried about them, especially if the carbon filter does its job properly. I'd just have to figure out a way to camouflage the duct, with either a dryer vent type setup or maybe the empty shell of an air conditioner. I'll admit that constructing something airtight in the window sounds difficult. I haven't seen anyone elses method for this either.

Option 2: Cut a hole in the door to the room and exhaust the air back into the house. With this method, I wouldn't worry about smell escaping unnoticed or conspicuous venting of hot air, but on the the other hand, I'd be pumping hot air back into the house which would raise my ac usage in the summer. Also I'd have to deal with the hole in the door somehow if anyone came into the house, and that might mean shutting the fan off, which wouldn't work for any length of time.

Option 3: Exhaust into the central air duct that's built into the room. I guess the downside is that if my air conditioning is on in the summer, I'd be counteracting it by pumping hot air into the same duct where the cool air is flowing throughout the house. Also I was going to use this as a passive intake and a perfect vector for cool, fresh air to flow into the room. I'd need to figure out another intake method if I used it as an exhaust. Air from outside is no good because in the summer it's too hot, and winter it's way too cold. I don't know how big an intake needs to be? Would there be enough air flowing underneath the crack between the door and floor to replace the air being blown out? Or does an intake need to be bigger?

What do you think is my best bet? This has been gnawing at me for a solid month.

you are laughing, build two sealed window boxes and vent in one and out the other, dont be paranoid about leaving windows slightly open all the time as no one really takes any notice, put a 20w lamp in the bottom corner of each window which you can switch off and on at night (two bedside lamps). when the outside weather gets too hot or cold just slip off the inlet duct and draw air from the room, but dont block off the flange in the window box, just leave it open, this is going to act as a buffer for the severe outside temps, my room is running perfectly like this with four 600w hps.

my problem was worse than yours.
1 window, so i built a box over the entire window in the room and totally sealed it with tape, and inserted a 20 watt light which i can turn on and off, so it looks like a bedroom light is on from outside at night, i cut a hole in it and put on a flange for the 8" duct and i leave the window open slightly for the fan intake, i have not taped the duct to the window flange for quick removal and replacement for severe weather, if it is too hot or cold i just slip off the duct from the window box and take the air from the room it acts as a temp stabiliser and it works brilliantly, my room was going down to 20c 68f when it was cold outside and up to 35c 95f when it was hot, now it is 77f to 82f but i have to keep on top of the temps twice daily even though i run a temp computer, i ran a duct through a glass window above the bedroom door by removing the glass and ran it along the hall ceiling which is 10 metres, i then lowered the ceiling to hide it, i ran it through above a cupboard door to a small window in my kitchen that i got an 8" extractor fan fitted to high up on the window pane, and i removed the iternal fan from it and i ran my exhaust duct to it, i used nice white plastic duct in the kitchen running along the top corner, i tried to vent in to the rest of the house but the house was going in to severe positive pressure, so i needed an out flow somewhere, my neighbour asked what the duct was a few weeks later and i just said the house was getting really stuffy so it was just to vent some fresh air in, he never asked again, anyway it works and i make sure i turn the bedroom light on periodically just for any nosey parkers outside. you will need to change the carbon in your filter as soon as it has expired or it will smell outside. and that is a no no, i keep fresh carbon ready all the time. as soon as use it, i buy fresh carbon right away.