One of the best methods to grow marijuana indoors is with a hydroponic grow system. This technique replaces soil with nutrient rich water. hydroponics allow you to strictly monitor the amount of water and nutrients your plants are getting. Because you're growing indoors this method requires that you use high powered synthetic lighting to maintain the plants grow cycle. These lights can get quite hot so another essential piece of equipment you're going to need is a hydroponic fan. Using a fan will keep your marijuana plants cool and growing at an ideal temperature. 

If you plan on growing marijuana indoors you're going to need a fan. The heat and humidity from the lights and plants will negatively effect the outcome of your harvest. Using a fan keeps the plants cool, provides fresh air, and removes stale air to keep your grow room functioning efficiently. Air is just as important as water and light when growing marijuana with a hydroponic system. Using a closed grow room with hydroponic fan ventilation in and out of the room is the best way to maintain an ideal growing atmosphere. You can then use a digital thermometer to ensure that the room is at the perfect temperature for the specific strain you're using. If you're using ducts and tubing to control the airflow, you can find hydroponic fans that fit perfectly inside the duct. A great affordable duct fan is the Booster fan by Active Air. These fans come in 6", 8", and 10" models that will fit nearly any size air duct. The Active Air Booster fan has a sleek design that runs very quietly. They come in variety of colors and cost around 50 dollars a piece.

There are simpler designs if you are looking for something cheap and lightweight. The Axel fan is a light aluminum fan that can be used in square or round ducts. These fans come with removable power cords and cast aluminum housing that is built to last for a lifetime. They're quiet and easy to use making them the perfect accessory to grow weed. The Dayton Axel fan is one of the quietest running hydroponic fans on the market. This industrial grade fan has a voltage rating of 115 volts and a max temperature of 176 degrees. These fans come in a 4" square model, or in 6" and 10" round models.

Another popular variety of hydroponic fan is the Can Fan. These sturdy fans resemble a can with the fans on each end. They are designed for in-line use like the duct fans and come in a variety of sizes for the perfect airtight fit. The Can Fan is designed for high humidity growing environments and it works efficiently with all Can air-filters. These fans and filters give you direct control over the atmospheric conditions inside your grow room.