100% Smell Proof Grow Tent Tweaks

This is the perfect setup to get a smell proof grow tent.Eliminating smell from your tent is a critical factor in stealthiness. Where growing weed is still frowned upon, it is advised to take a stealthy approach. There are a few key tools at your disposal when considering removing smell, and that is filtration of the actual smell molecules, and air flow within the tent.

Going from a horribly smelly tent to a smell proof grow tent which can not be detected is really not that hard. There are a few key ingredients which you need to get down, and everything else will more or less fall in line.  Consider the situation, you don’t want the smelly air escaping the tent, you want it all going through a little filter, a tube, and ideally be exhausted out of your house. 

To accomplish this, there needs to be a smell filtering device connected to an air sucking device which leads out a window or a duct hole. Enter the carbon filter, and inline air blower fan. When these two devices are connected together, it creates the magic of a smell proof grow tent!

I’ll show you what to look for when choosing a carbon filter and blower fan below. It’s quite simple and straightforward to create a smell proof grow tent, so let’s take a look at how it’s done.

Carbon Filter

In terms of filtering the smell, activated carbon filters are the industry standard. They absorb the smelly molecules from the plant, and exhaust fresh air. Although they can be a hundred or so dollars, they last a long long time. I’ve had friends who have been using the same carbon filter for four years and still going strong. It’s a really good investment which will not let you down; better safe than sorry.

Here in Canada, where growing is legal, people have still been getting in trouble for having smelly tents. You can actually get ticketed now for exhausting your weed smells into the neighbourhood for nuisance. I suppose it kind of makes sense, not everybody loves the smell of dank, and some people straight up hate it.

Even if you love it, the smell would become a little bit overwhelming after a while, don’t you think. Also, it’s best to just not let people know that there is weed growing at your house. Even if it’s legal there, keep the operation low-key, and get yourself a carbon filter!

Even if you love it, the smell would become a little bit overwhelming after a while, don’t you think. Also, it’s best to just not let people know that there is weed growing at your house. Even if it’s legal there, keep the operation low-key, and get yourself a carbon filter for a smell proof grow tent solution!

Ram 4" Carbon Filter - Great for Beginners

This is a fantastic choice if you want a cost effective but quality and reliable carbon filter. It uses some of the highest quality carbon in the world, at an extremely small size of 0.03 microns. The smaller the carbon is busted, the more surface area there is for the smells to get absorbed on. I feel like as good as this is, you can still smell a little bit of a smell coming through though, remember – this is the budget choice. If you want something nice, check out the Phresh Filter, or my article on the best carbon filters. 

To get a smell proof grow tent, get this crazy RAM carbon filter.

Air Flow

The other recipe for smell proofing your grow tent is air flow. The key here is negative pressure, because that keeps all the smelly air inside, and forces it to travel through the activated carbon filter. If you had a grow tent with positive air pressure on the other hand, the smelly air would be blown out all the little seams around the tent. This would lead to a smelly room, which is not what you want.

To avoid this mistake and ensure a smell proof grow tent environment, you need a blower fan which sucks in air, pushes – or pulls – it through a carbon filter, and then ejects it out of the tent. This sucks air out of the tent, forcing air to rush in, and preventing air from going out from anywhere but through the carbon filter. This situation is called negative pressure, and that’s what you want.

Maintaining negative pressure requires that you have the right blower fan for the job. This will depend on the volume of your grow tent. Say you have a nice sized 4′ x 4′ x 6′ tent, you will need a decent amount of suction, I would go with around 150-200 cubic feet per minute of air flow. You will find these specifications on the product’s website, just look around. I have a separate page on ventilation, so check that out!

You can tell that negative pressure is being maintained when you close up the tent, and the sides get sucked in. This essentially means that more air is being evacuated than is being brought in. Also, you can tell how big this difference is by the amount of time it takes the sides to suck in completely. 

I like to see it happen relatively quickly, in around 6 seconds or so. If it takes a while, or the sides aren’t bending in as much as they should, that means you aren’t pumping out the air quick enough, and you need a better air blower.

Getting the Right Blower Fan

The most important thing to both keeping a good air flow, and getting all the smelly air through a carbon filter is a good blower fan. Like I explained, it’s all about the CFM, but some of them are unreliable, and make annoying noises after a while. 

It’s important to get a good fan which can be on all day long, as you will probably want to keep scrubbing the air all day, especially during flower phase when it gets really smelly. 

If you have the cash, consider also getting a speed controller. This little device is just a knob which you can turn up or down to control the speed of the fan. This is great because sometimes, like in summer, you might ramp it up, and other times, like at night in winter, turn it down. Gives a lot more functionality to your smell proof grow tent. 

A little warning, don’t get a duct booster. Some people get them thinking it will do the trick, that’s wrong. I would only recommend such a product for a grow box, but even that is a stretch. Again, I go into this topic in the ventilation section of my website. 

Well, that’s honestly about all there is to smell proofing your grow tent. I hope you found this resourceful. Happy growing.

A blower fan is a completely crucial part of any grow tent ventilation kit.
Hydrofarm Active Air Inline Blower Fan

This is my trusty day to day air blower. It’s been going strong in my smell proof grow tent for a good three years now, and it sounds the same as it did the first day. I use this to not only suction air though my 4×4 tent, but also the 3×3 tent that I have connected to it via ducting. It maintains air pressure throughout both tents very well, and there is no smell, even during the peak of flowering cycle. I strongly urge you take a look at this product – she’s a good one. Available in 4″, 6″, 8″ manifolds, whatever you need.

Conclusion to Smell Proof Grow Tent Guide

See, that’s not so hard. In fact, keeping a smell proof grow tent is probably one of the easiest things to accomplish and understand when it comes to growing. Just two easy components and you’re good to go. 

Make sure the ducting, and the flanges for the carbon filter / blower fan are the same. For starting out, I recommend you get  4″ or 6″ equipment. Anything more is overkill. I still rock the 4″, and it’s working quite well for me. Sometimes I want to upgrade but I’m waiting for the crazy Hydrofarm blower to die – it’s not happening!

Also, make sure that the carbon filter is rated for the amount of suction your blower fan creates. If the filter is rated for less that the rate you’re sucking at, then the air will surely come out smelling like a little something something. 

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