I'm not familiar with Hydrohuts, but here is some info in the hydrohut faq's
When setting up a HydroHut, why is the canvas difficult to get over the frame?
The HydroHut canvas is made to fit very snuggly over the frame so there isn’t an inward or outward bulge in the canvas if using positive or negative pressure methods. Unzip all zippers first, every zipper gets unzipped all the way before pulling the canvas over the frame. The frame should be sitting squarely in the bottom of the canvas before starting. The directions show this step. The canvas must be inched over the frame evenly. Pull some over the top on the left, then the same amount on the right, go back to the left, do a little more, then the right etc.
Why does my new HydroHut smell like new plastic?
The inside of the HydroHut is made of poly-urethane plastic. This plastic is chemically inert and doesn’t off-gas. When plastic is new, it has a plastic smell due to organic matter left over from the production process, much the same as a plastic garden hose or plastic bottle. A solid poly-urethane plastic doesn’t off-gas, a poly-urethane foam or liquid poly-urethane can off-gas. It is highly recommended that you wipe down the inside walls of your HydroHut with paper towels and water. This simple process will remove most organic matter left on the plastic from the production process. Washing the walls lightly and letting the HydroHut air-out a bit before using it will help with the new plastic smell.
I’ve been growing forever and know what I’m doing, why do I need more air movement in the HydroHut than in a normal, house room grow area?
Growing in an all plastic environment is not the same as growing in a room in a house. Atmospheric values, temperature and humidity act differently in an all plastic environment. A room in a house will absorb moisture and heat differently than a wall of plastic. Passively cooling the HydroHut is a very bad idea! Intake and exhaust vent holes are in the HydroHut for a good reason. Taking advantage of these ventable ducts is a priority. Using a blower to force air into a HydroHut but letting the air find its own way out has proven to be very problematic. Even if you’re in a cooler, ocean side town and have never needed forced-air intake and exhaust before, when growing in a HydroHut, it is highly recommended that you employ the use of intake and exhaust blowers.
Not using ducting doesn’t work well. The air that is forced into the HydroHut will passively find its way out and then find its way right back into the HydroHut. This is far from an ideal situation and can cause major air quality problems. Fresh air from outside should be forced through a duct by way of an adequately sized blower and then into the HydroHut. Exhaust air should be forced out of the HydroHut through a charcoal filter, either pelletized charcoal carbon or a charcoal fiber filter and an exhaust blower of adequate size. Using an axial fan (computer fan) to exhaust your HydroHut is wrong and inadequate! Even if you live in a cooler environment and are used to using minimal fans and blowers, growing in a HydroHut is different and as such must be treated differently. Exhaust air should be ducted out of the room, not into the same room that houses the HydroHut! A charcoal filter should be INSIDE the HydroHut to absorb any organic molecules that can be a detriment to your plants. If you have one or more HydroHuts inside of one room and plan on using one charcoal filter in the main room instead of a smaller charcoal filter inside of each HydroHut, then you run the risk of having air-quality problems in each HydroHut. This is being repeated because it is of paramount importance.
I live in a cooler environment and have never needed to air-cool my lighting system. Why do I need to air-cool the lighting system in my HydroHut?
If you do not air-cool your lighting system inside the HydroHut, you run the risk of making your charcoal filter completely ineffective. Heat and humidity greatly reduce the effectiveness of activated charcoal. Again, HEAT AND HUMIDITY hurt your ability to filter (absorb) organic molecules. Having a charcoal filter inside the HydroHut is necessary, but if that filter is four inches from a burning hot lighting system, the filter will be almost useless. Even if you are piping in air conditioned cool air into your HydroHut, the micro climate around the filter will be changed for the worse by the heat being emitted from your lighting system. Air-cool your lighting system with an adequately sized blower and ducting. Duct this hot air out of the HydroHut and out of the room in which the HydroHut is sitting. Recirculating used air again and again is a recipe for disaster.
The HydroHut is watertight, what do I care if I spill some water inside?
Research on used HydroHuts it has shown that sitting water between the first and second water-proof floors was left to dry out on its own. Being sloppy with your watering will only hurt you in the end. If you water with a garden hose or watering can and frequently miss your pots and get water on the inside wall of the HydroHut, that water will run down and sit in between the two water-proof floors. Sitting water will eventually cause the frame to rust, even if the frame is powder-coated or dipped in a stainless solution. Furthermore, sitting water mixed with organics will cause the organics to grow molds. A warm body of water sitting between two layers of plastic will attract bugs, molds and can even lead to a bacteria build up. Please be conscious of where you are putting your excess water.
