These are simple clip-on fans which can be attached strategically around the space. Ducting is a tube that connects to the exhaust fan outside the grow tent. Ducting can be used to channel the air out of a nearby window.
Similarly, depending on where you choose to place your carbon filter, ducting can be used to create a tunnel between the filter and the fan, so that no particles escape during the transition.
The end that will be emitting the air will need to be just outside the grow space. This is so the air travels through the filter before it leaves the space. Connecting the two can be done with ducting. On the other end of the fan, ducting could be connected to direct the hot air out of the window, or to be dispersed in the outer area of the grow space.
If you are looking to bring new air into the space with a passive system, you will need to create a large intake hole in the bottom corner of the grow tent. Alternatively, you can create several smaller intake holes. For an active intake process, you will need two exhaust fans: One to bring in the air, while the other removes it.
The removing fan will be placed at the top of the space, while the other at the bottom. Lastly, to keep the air moving, you can also use oscillating fans that can be clipped onto the tent structure. These are optional but handy for cooling down lighting. Many people believe the best place for an intake port is diagonally a crossed from your fan. The reason for this diagonal placement is to make sure that any new air that enters the room has to pass through the entire room before being expelled by your exhaust fan.
Also be aware that if you are not sure where the air that feeds your intake port is coming from, you may need to add a screen to prevent insects, animals, or dust and pollens from entering your room. Many people end up purchasing an equally sized exhaust fan setup to run as intake fan from their intake port.
If you can only have one or the other, the exhaust fan is much more important, but adding an intake fan can be very beneficial, especially in rooms with limited natural air flow.
Sign up to receive exclusive deals and more! Be the first to know about sales and promotions, and stay up to speed with tips and tricks from our team of expert cultivators. Understanding Ventilation. Site Links. Learn by Topic. Filters — If a carbon air filter is to be used with your exhaust system, you must account for the friction this hardware will add to your system.
It can be useful to round this up to the nearest round number. There is no intake fan to bring in the fresh air. Instead, fresh air is allowed to enter through an intake hole or duct, based on the negative pressure created inside the room. For this system to be effective, the intake hole needs to be much larger than the exhaust hole or duct.
Or you can use multiple small intake holes to provide adequate suction. So to balance out the effect of one fan blowing out the air through the exhaust hole, you have another fan bringing in fresh air through the intake vent. In this system, relative sizes of intake and exhaust vents do not matter much. Such a system should be considered in grow rooms where you cannot have larger intake holes for passive systems.
For beginners, a simple in-line duct fan is the best option. To find the perfect fit for your grows room, find the CFM rating for the room. Calculate the volume of your grow room in cubic feet by multiplying its length, width, and height.
For a simple system, the CFM of your fan should be greater than this number. The guiding principle here is the idea that the exhaust fan should be able to completely replace the air inside your grow room in one minute or thereabouts. Exhaust fans are commonly available in different sizes based on their diameter in inches. These usually include 4, 6, and eight inches models. The size of fans for smaller grows should depend on the duct sizes used in the rooms.
Here six inch is the norm, as that is the most common size for ducts. You can even use a 4-inch fan inside a 6-inch duct. But for this, you will need to use converters. In larger and more complicated grows, the efficiency of the exhaust system is critical.
It can be affected by a lot of factors like the length of the ducts, and the type and age of filters used. But the more accurate step is to multiply the CFM rating of the room by the exhaust efficiency drop.
In larger systems, if the exhaust efficiency is not factored into the calculation of the CFM, the exhaust fan will not be able to remove all the air efficiently. If you plan to create an active intake system, find the appropriate size of the exhaust fan for your room first.
The intake fan size can be kept identical to the size of the exhaust fan. Flexible aluminum is the most straightforward choice for most affordable grow systems. There are also more expensive choices available, like insulated or heavy-duty ducts. Size and length of the ducting are the most critical factors.
These can affect the exhaust efficiency. Try to keep the ducting as short as possible to reduce the distance the exhaust air has to travel. You should also keep wrinkles and bends in the system to a minimum for the same purpose.
Ventilation for a grow room is as important as breathable air for us humans. In the absence of a proper system of ventilation, your indoor grow will never succeed.
In larger, more powerful grow systems, creating a suitable ventilation system can be a complex task indeed. A typical setup places the fan and the filter inside, which makes it easier to manage while dampening the fan noise.
Both can be situated in any order within the ventilation chain if air is being pulled out of your grow space. For example, your grow lights might get in the way of your cooling equipment. We recommend setting your extraction fan at the highest point possible. Since heat rises to the top, exhausting that hot air at that point will make the ventilation process efficient. There are various sizes of grow spaces, each requiring a different amount of airflow to ventilate them. Exchanging stale air inside with fresh air from the outside of your grow space is vital for optimal plant growth.
This figure is measured in CFM or cubic feet per minute. To find the amount of airflow needed for your grow space, first find its volume in cubic feet. Then multiply its length by its width and height. Here is what the formula looks like:. Multiplying the dimensions together would equal 72 ft 3. Hold on to this number, as you will have to account for the ducting, carbon filter, and other accessories you might add.
Adding components like ducting and carbon filters will reduce fan performance in your grow space which affects the fan size you need. When it comes to ducting, the number and sharpness of its bends factor into the airflow resistance.
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