Could you post a picture of your setup? Do you have a place to vent out heat?
You have two main options for smell control - a carbon filter with fan, or the use of odor neutralizers (like sprays and other smell-control products).
In order to make a carbon filter most effective, you have to sort of seal your grow space, then set up a strong exhaust fan pointing out with the hot air being vented outside.
A lot of people set them inline with the grow light, to scrub smells and vent heat at the same time:
This is an example of a carbon filter in action
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The way they work is they blow air through a bunch of carbon, and that "scrubs" the odors from the air. Without enough windflow, it won't push through enough air to make a difference. That's why a strong enough fan makes them more effective.
If you've got one small plant, you could use a smaller setup like a 4" carbon filter with matching inline ducting fan.
You might be using CFLs or LEDs where you can't connect to the grow light with ducting.
In that case, you can skip the ducting and just clamp the fan to the carbon filter directly and pointed out from your grow space.
If you want, you can even go a step more simple, and just put the carbon fan on top of the fan and just let it run in the room, pulling air through the carbon filter. That's not as effective as using it as part of a closed system, but it'll clear out most of the smell from the air pretty effectively in a small space.
Or if you don't have a lot of smell to fight, you can use something like ONA gel just to clear the air, but it does have a strong "cleaning" smell and you can't keep it too close to your plants or the chemical smell can get on your buds.
But if you have a closed tent, a jar of this stuff outside the tent can help keep the smell from leaking into the house. But they get used up quick, so until you get something more permanent like a carbon filter, you'd have to "re-up" with these about once every 3 weeks.
Ona Gel is strong at removing odors - Just don't let this stuff be too close to your plants for long (for example don't stick it in your tent with them), and replace every 3 weeks or whenever it stops being as effective.
It's also good to have an effective spray if there's an emergency. I like this Ozium spray, it lasts for about 30 minutes and smells like a citrus cleaner. I've found it's really effective at hiding weed smells in a pinch. Just a tiny spritz should do it - a little bit goes a long way!
Those are sort of your main options for smell control - a carbon filter with a fan, or the use of carbon neutralizers like ONA or sprays
