Exhaust to where?

Indoor Growing Grow Room
1 
 So, my next question is as follows'

For people using a charcoal filter behind their exhaust fan, where does the rest of the exhaust piping go to?.

  1. Is it ran outside?.
  2. Is it ran to a chimney?
  3. Is it ran into another room?.
  4. Is it ran into a basement?
  5. Is it ran anywhere at all?.

Because if the exhaust piping is ran nowhere. This begs the question.

  1. What about the smell?.

Which now leads to the next question
which is:

  1. Is a charcoal filter so dang good it removes the smell of growing marijuana so that people never have to worry about smelly growing weed in places that frown upon such activity?

I tend to think that there is nothing that would cover up the smell of growing weed.

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Wherever you want to exhaust it. If you are only concerned about managing smell, then the only remaining concern is management of grow space temps. If temps aren’t a problem, then exhausting the air back into the same grow space is fine. Just be sure that you have enough airflow for CO2 replenishment.

A quality charcoal filter will do a great job of removing smell.

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The charcoal filter does a very good job. But you need to spring for a good one, not a cheap Amazon one. It really doesn’t matter where it is exhausted to.
How this works is the exhaust fan creates a negative pressure in the tent. This will not allow any smells to escape out of the tent. The exhaust air is scrubbed through the charcoal filter. This removes maybe 98% of the smell. The result is a fairly smell free grow area. But of course if one has a bloodhound type noise, like my wife, you will probably smell it somewhat.

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My filter is in the tent. Going to the fan outside the tent. It vents straight into my laundry room. Smell is minimal if tents are closed up.

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I put in a dryer vent to the outside, looks like an ordinary vent.I have plants outside to negate the smell.

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Outside is the most common place to vent.
As @Weedlover1 mentioned dryer vent is a great choice. Good luck :v:

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i use these, tube run from the top vent through the filter in the same room. takes care of the smell for me pretty well tbh
and doesnt take up space inside the tent

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I exhust out a top hole and into my LUNG room.

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@Hershy420 @Ickey @Hershy420 @Audiofreak @4204life @Weedlover1 @Bubbala @kellydans
I must be not understanding something here.
So the part that says AC Infinity is the filter?
So if you have a exhaust hose coming from the tent, going into the fan which is connected to the filter, where is the exhaust hose which should be connected to the filter, so smell can be diverted?

Or:

does nothing connect to the secondary exhaust filter port?. Which if that’s the case the exhaust air just blows out into the room that the exhaust fan and filter sit in?

If all the above is correct than that would mean smell is of little or no concern. Which would mean a person with no secondary hose running somewhere must have a lot of faith in the charcoal filter.

I’m still working on gathering up everything I need. My grow room is built, insulated, painted. And my Samsung grow light arrives today.

As you can see I overthink and dwell over the possibility of smell lurking. That’s my biggest concern.

I’m gonna run a T8 with charcoal filter for exhaust, ran into a chimney with a S6 with a box filter for intake.

Basically everything I buy and do stems from y’all explaining how this works.

And I suffer from OCD (obsessive compulsive disorder) which means I way overthink everything.

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@Hershy420 @Bubbala @kellydans
I keep looking at that picture you sent @Hershy420. And also my question pertaining to that picture.
So, I’m gonna take another angle at this when it comes to exhausting smell.
Would it be a incorrect assumption to assume that in states where it is legal to grow weed, people are far less likely to be concerned with the smell of growing weed, than people who live in crappy commonwealth states where growing weed is frowned upon?.

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@Audiofreak
what’s a LUNG room?

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Lung room would be inside area you pull your fresh air from for grow space. Carbon filter you can pull hot stale air through an Exhaust or push air through filter.

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Basically, you’ve got it right.
Ideally, a filter should be close to the source of odor and on the intake side of the air flow, and connections should be as close together as possible for best volume flow. This means all hardware/ducting inside the grow space, vented to just outside the grow space. Any changes to that setup is a compromise from the ideal.

Many times growers run into situations for various reasons that make it impossible to achieve the “ideal” setup though, so they start moving parts outside the grow space. Some just the fan, some the whole thing, it depends on their unique situation.

Some leave the filter in the tent, and run ductwork to the fan outside the tent where it blows into the room. Others will add more ductwork to the fan and pipe it somewhere else. Nothing’s changed in the order of hardware, just longer duct runs are made between them. (This will reduce volume, and higher fan speeds will be required)

Some put the whole assembly outside the tent, to free up headroom space to get more height from their light. Since the filter has one open end and one closed end, the order needs to be changed, and it then needs to be moved to the exhaust side of the air flow. It’s not that much different, but all the fan pressure built up before the filter will seep odor out of any little seems or holes, if there are any. For the overly paranoid (me before it was legal), the filter and fan can be in the grow space, and a short run of ducting can run outside the tent to another filter for double filtration. That really helped me when I could still catch a slight hint of odor when I walked into the house from a single filter. Again, reduced air flow.

Of course if venting outdoors, a filter can be optional. It’s still recommended, just to keep the fan motor area clean from dust buildup. Charcoal doesn’t filter particles, but filters do come with a cloth cover for that purpose. (Cloth can go on the inside of the charcoal can if used on exhaust end of airflow, and outside of can if used on intake side of airflow. Of course it won’t do any good for the fan if it’s on the exhaust side. It’ll just keep the charcoal from plugging up quicker I guess.)

Of course none of this will matter when you open the door to the grow space in the middle of flowering. It’s gonna smell. Then an outdoor ventilation might serve better, or a room where the door can be closed, and the entire room scrubbed through the carbon filter before leaving the room door open to the house again.

I will add that it’s not about doing it the “right” way, it’s about doing it the right way for your unique situation. We all have different hurdles to overcome and every space is different, if even just the climate it’s in.

And yeah, when it’s legal, odor is just about personal preference then.

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A lung room is any room that a grow tent sits in, and the conditioned air from the room is used to vent, heat or cool the tent. If you are venting in and out of a lung room there is no reason connect a hose to last device in the exhaust line.
If I were to vent into a chimney. I would hang the filter in the tent, then hang the exhaust fan outside of the tent. Then connect the fan to the chimney.
Venting to the chimney with a filter will be a very good solution for smell. But there may be some drawbacks to this that will need to be dealt with. If you exhaust more air than what a small bathroom fan will move,(approximately 25 cfm). You will need a source of air to replace the air that is exhausted, (make up air). Most of the time the only options for make up air is from the outside. This a problem since outdoor air may need to be conditioned. This will be the main issue for you, where is your fresh air coming from into the room? Also there will be what called chimney effect, when you move heated air up a chimney, it will want to flow up the chimney this will greatly reduce the size of exhaust fan if using a tall chimney.
It sounds like you may may be able to use the exhaust system described before, along with some type of a passive intake.
All conditions of grow rooms are very different and this makes giving good advice difficult.

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My 2x4x6 tent is in my master bedroom. So the bedroom is the Lung room. I like short tubing runs so filter is conected to fan and is exhusted into Lung too. Out the top left Port. Tubing less than 1 foot long so fan efficiency is maxed. I get zero odor unless i open the tent and when i have to i burn some incense when watering. A good filter will work perfect. And yes the part in that pict "ac infinity is the filter.

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yes, of course the states that are legal are less concerned with the smells.
but for me, regardless of whether its legal i still can’t grow where i am.
i live in an apartment building where the smell would be a big concern, its only legal to grow in ur own homes technically.
it just became legal in my state, 23rd state to become completely legal as of August 1st 2023

but i was growing before that, ive had my plants started since march, they stink when i open the door up.
but honestly, even than, with the air flow from the tent going through the carbon air filter, it manages the smell quite well.
the exhaust fan just moves the air, the carbon air filter that the fan is connected to is what gets rid of the smell, regardless of where it is vented to

some strains could laugh at a carbon filter, but most carbon filters can manage quite well, i got AC infinity brand equipment cuz i trust the brand, could use whatever. u can even make home made carbon air filters if the ones u buy dont work for smell

regardless, u have ur personal situation, i hope i could help a little with some insight, hopefully u got plenty of information from everyone, i wish u luck in ur ventures

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