Are the shelves moveable to different heights? Can they be removed completely?
Yes, the shelves are totally adjustable using clips that snap around the legs, much like a baker's rack. They add stability, so I would not remove them completely, but they can be set at maximum and minimum height to optimize available space.
Are these sturdy enough to be stacked?
Possibly, but we would strongly advise against it.
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The GrowLab GLCL has all the features you could ask for - and more! Outfit the GrowLab with the ventilation fan, lighting system and growing system of your choice and you will have the brightest, slickest, and most affordable grow room available.
Growlab CloneLab: 4'1 x 2'1" x 3'11" (outside dimensions)
The GrowLab utilizes thermal film on the interior which is highly reflective, waterproof, and extremely insulative (offering 97% thermal protection). This film is also non-toxic and won't release any harmful gasses that can damage sensitive plants. All of the zippers used in the tent are extremely durable.
The GrowLab utilizes intake/exhaust ports that allows them to adjust to fit various sizes of ducting. Drawstrings eliminate the need for duct hose clamps and make installation of ducting and fans quick and easy. The GrowLab also utilizes the same type of socks to allow cords and tubing to enter or exit the structure while keeping light from doing the same. All GrowLab models have a sock port in the back corner of the roof where the exhaust fan can be attached. Instead of strapping the fan to the interior of the tent you can simply sit the fan in the port on the roof for an easy and effective mounting solution. Not only does this make for a secure fit (there is no chance of the fan breaking away from the straps due to vibration and falling on the plants), it also takes one more piece of heat-generating equipment out of the grow room (although the fan can still be strapped to the interior if desired). Passive intake ports are located near the floor of the tent and have a Velcro cover that can be opened and closed easily depending on how the ventilation is setup.
The GrowLab frame is constructed of 0.80mm thick metal poles, making it very rugged for everyday use. The poles are also powder coated to prevent rust, aid in installation and enhance their appearance. The poles that make up the ceiling framework are moveable, making it much easier to adjust the positioning of lights, filters or anything else you may end up hanging from them. The ceiling poles have been improved to handle significantly more weight, especially at the center (where most other tents have a tendency to sag). Their new design also allows them to snap in place, so while they are still moveable, they will stay where you want them instead of sliding around.
The new corner fittings are made from a polymer that bends under extreme pressure instead of just snapping prematurely. These fittings are much stronger than competing fittings (plastic or metal) and won't rust like metal fittings. Their design also makes installation much easier than other tents, since the frame poles slide easily into the fittings with little or no resistance. No metal tabs that rust in place or break off.
All GrowLab models ship with complete, full color, illustrated instructions.
|The GrowLab is a well made tent matched to the right use.|
One thing to know about all grow tents across all brands is they are not 100% light tight out of the box. We mention this right off the bat because that is a make or break issue for some people. Outside of not being 100% light tight, people are rarely every disappointed with their purchase of a grow tent. They are fun to set up, use, and they are practical and effective. So we are removing the light surprise right now. All grow tent brands and models can be made fully light tight with basic modding (some plastic and tape here and there). Think of it as a money savings and the feature of being able to easily customize the tent to your garden needs.
The GrowLab is well made. The internal support bars are sturdy, the fabric is thick and attractive looking, the inside is reflective and has a removable water catch at the bottom. The zippers are very smooth, they have thick ridges and feel they would last a long time. Because of the smoothness and thickness of the zippers they are not light tight. GrowLab addresses this with the use of flaps - some internal, and some external. You can see in the pictures that the front vertical and top horizontal zippers are covered with external flap and internal, while the horizontal zipper around the bottom has the flap on the inside. This is where the GrowLab leaks light. A small amount of light comes in through the zipper around the bottom and down under the internal flap where it does not sit 100% tight against the zipper. This can be addressed by duct taping the internal flap down.
The GrowLab models are all well equipped with ports. For example, the GL145 (4'x4') has five airflow ports, two power cord ports, and three free flow air ventilation adjustable flaps. This lets you vent a light hood and still have three more ports just for intake and exhaust. The number of ports varies per model and matches the need of that sized tent. The ports use the draw string sock feature that makes it possible to mount ducting and fans without the use of clamps.