How To Smell Proof A Grow Room

The simple answer to this question is no, grow tents are not smell proof. Before the room classifies as smell-proof, the grow tent might have to conceal the scent of your flowering plants. While grow tents are unique for various reasons, you have to be cautious if you want to conceal the smell. There are many benefits associated with using a grow room, including temperature regulation, improved lighting, and humidity. Other grow rooms are also available with components such as fans, ventilation systems, and carbon filters, which are ideal for controlling the smell in the grow room.

Proper air circulation will help you maintain the temperature, and odor levels in your grow space. Therefore, you can recycle the already used CO2 out of your grow space. Ensuring that the grow space has sufficient air helps you achieve the best ventilation results. Using resources such as high-intensity discharge lights are not suitable for a grow room, because they raise the temperature. Yet, even the smaller lighting systems such as light-emitting diodes and small fluorescents have challenges as well.

What Strengthens the Odor in A Grow Room?

Left unchecked, the smell of a flowering plant can linger in the air and increase in intensity over time. Factors such as high humidity and temperature are likely to prolong the presence of ascent in the growing area. Thus, the first step to consider is to evaluate the moisture and temperature levels of the room. It’s also important to note that different plant species have as many different germination needs. As your plant’s transition and grow, ensure that you control the vital plant growth factors to provide the best results. You can use resources such as dehumidifiers and air conditioners to solve the issue. 

If you come across an emergency issue where you have to get rid of the smell fast, you can consider the following technique. Place the exhaust fan on the top section of the carbon filter, and the position where the scent is strongest. The best part about this technique is that you don’t have to connect the fan to anything. You just have to let the scrubbed air travel back to the room. Consider investing in a specially made vents for your groom. While this might seem like an additional charge on your project, the overall benefits make it a reasonable solution.

How Do I Control the Smell In My Grow Room?

Yes, it’s tough work to hide the smell of your grow room, especially when a flowering plant nears the harvest season. Being able to create an enclosed air space where the smell won’t escape is usually a daunting task. 

The main reason behind such an occurrence is that plant pots require ventilation, for photosynthesis. Thus, the old air has to get out, as new air comes in, with humidity, and to provide temperature control benefits. 

Thus, when it comes to making the grow tent airtight and smell-proof, you can consider this a tough challenge. That said, there are various techniques you can use to reduce the level of odor emanating from the grow room. Usually, these techniques help you to eliminate or redirect the smell in a different direction partially.

1. Use Smoke Absorbing Gel

One of the best methods through which you can eliminate the smell from a grow room would be to use an absorbing gel. The Ona Gel is among the leading brands when it comes to controlling odors in grow rooms. It’s a cost-effective and robust product.

More so, the Ona Gel brand makes various other odor absorbing gels that you can use in your grow room. These gels work by neutralizing the smell in the air, thus reducing the scent of the flowering plants. That said, you have to remember that these gels are sometimes not entirely effective. While they work to a certain extent, if you have a few plants that smell strongly, these gels might not be suitable.

In some cases, you might have grow rooms with three plants, but requires large amounts of absorption gels. Furthermore, the scent of flowering plants is usually very clear, and you might have to use this approach along with other methods.

The best way to apply the gel would be to apply it outside the room. To keep any scents contained, you might have to use the gel along with some air fresheners.

2. Get A Good Carbon Filter

Using a carbon filter is a practical approach for controlling the scent of flowering plants in a grow room. Usually, the carbon filter works best when used together with an inline fan. Most carbon filters consist of used blocks, which work to trap carbon and neutralize any scents. Aside from being common for grow rooms, carbon filters are also conventional for various other applications.

carbon filters

The main benefit of a carbon filter is that it absorbs large amounts of weed while maintaining the composition of the air. That said, even the best carbon filter won’t be able to remove 100% of the smell from your grow room. 

Thus, consider equipping the grow room with an inline fan or any other suitable system which can clean large amounts of air. The strength of the fan and size of the carbon filter determine the amount of air that can be cleaned at a given time. On average, the carbon sizes should have a 4 to 13-inch diameter. To determine the best suitable carbon filter size, you will have to consider various other factors as well. These include the size of the room and the number of plants in the area.

3. Temperature and Humidity Control

This applies to every aspect of the planting process. The temperature and humidity level in a given area will significantly increase the scent of flowering plants. Have you ever wondered why collections of trash outdoors tend to smell the worst during the summer months, rather than winter? Well, it’s the same case as a grow room. High humidity and temperature levels, especially during the summer, are likely to increase the marijuana scent.

4. Direct Ventilation Exhaust The Right Way & Seal Up Holes

Also, you have to consider the ports through which you will direct the air. Any savvy farmer will know that plants require air and climate control to achieve the best development results. Thus, sealing up a grow room completely might not necessarily be a good idea. That said, using a carbon filter, and a well-installed ventilation system will be a good start. 

The other thing to think about here is where you are directing the air. As mentioned a couple of times now, your weed plants need air and climate control, so totally sealing up a grow room is out of the question. The primary issue to consider is that the air coming from the room might have a strong marijuana smell.

You can seal the small holes by using sealants and ensure that the doors in the grow room provide an airtight seal. However, air will still come from the grow room regardless of which technique you use to control the problem. Using a combination of resources such as carbon filters, can play a significant role in controlling the ventilation system.

Should I Use an Ozone Generator?

Broadly speaking, an ozone generator is not suitable for a grow room with poor ventilation. More so, an ozone generator is not ideal for the grow room, especially during the harvest or pruning seasons. Ozone can easily compromise your overall health, and you should consider other solutions to the problem. These include ventilation fans, which you can install at strategic vents in the room. Using ozone generators is also a delicate process, which is states such as California have imposed strict regulations on its use. 

Thus, using an ozone generator is a delicate process, and you might have to conduct further research for your needs. There are many different brands of ozone generators, with as many different air capacities. You will have to take all these factors into perspective when buying one for your grow room.

How to Find & Install the Right Carbon Filter

There are some simple steps involved when installing a suitable carbon filter for your needs. The steps may vary in relation to factors such as the brand of your filter and more. They include

Calculate the Exhaust Diameter

Most of the conventional air-cooled grow lights have sizable 6-inch exhaust holes, which are perfect for ventilation. For most small-scale farmers using tents, you want to use a unique combination of resources such as a fan, ducting, and carbon filter. Why is a 6-inch exhaust hole suitable? Well, the 6-inch fans are powerful enough to direct air from the grow room. Any small-sized fan is usually too weak to redirect the air from the grow room area.

Determine the CFM Rating of your Fan and Filter

You also have to ensure that the CFM rating on the carbon filter is similar or higher than the one indicated on the fan. This way, you can ensure optimal efficiency when it comes to air ventilation purposes. Using this approach helps to ensure that the filter only cleans a small amount of air at a time. For instance, if you have a filter indicated “300 CFM”, then the fan should also be rated as “300 CFM.”

Install A Fan and Filter Into the Exhaust System

The next step is to install the fan and filter into the exhaust system. A fan is important for the ventilation process in the grow room. While there are no specific steps involved in the installation process, you have to ensure that you place the fans and filters in the correct positions. Using this approach will ensure that you install a highly effective resource to clean the air in the grow room. 


A grow room can be one of the most effective techniques for growing plants. Being able to control the scent from the grow room, especially in small indoor spaces, requires various techniques. Even if you are not able to eliminate the smoke, there are still different effective solutions for the problem. This is especially true during the flowering season when plants tend to have the most scent. Furthermore, factors such as temperature and humidity

A good example would be medical marijuana plant owners who want to control the smell of a grow room, in places such as dispensaries. Using techniques such as gels, carbon filters, inline fans, and more are all useful. Moreover, using a combination of these techniques would be the most suitable approach for controlling the smell.

We will be happy to hear your thoughts

      Leave a reply