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DIY: Carbon Air Filters for Hydroponics

Air filtration is an important component of hydroponic growing, as plants grown indoors do not receive the natural ventilation that plants grown outdoors can take advantage of. Carbon filters are an inexpensive and easy way to achieve this effect. They filter the air and trap odor molecules produced by respiring vegetation. As air passes through the carbon filter, particles are trapped in the pores of the carbon. Carbon air filters can be made with some basic materials and can be fitted over an existing exhaust fan, or placed over the top of plants.

Things You'll Need

  • Scissors
  • Knife or razor
  • Heavy cardboard box up to 6 inches wide
  • Hardwood natural charcoal
  • 12 volt fan with AC adapter
  • 6-inch wide air filter material
  • Duct tape
  • Screwdriver and screws
  • Pencil
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Instructions

    • 1

      Tape one side of the box flaps shut. You will need to access the inside of the box, so leave the top open for now.

    • 2

      Hold up the fan to the outside of the box and trace the outline of it. Make sure that you trace the intake side of the fan.

    • 3
      Use the duct tape around the hole where the fan mounts to the box.

      Cut out the hole in the box. Mount the fan with screws and screwdriver onto the box so that the air will blow away from the box.

    • 4

      Cut a circle or square out of the opposite side of the box approximately 4 inches by 4 inches.

    • 5

      Cut two pieces of the air filter material about 6 inches by 6 inches wide. Attach one on the inside of the box with duct tape to cover the hole -- attach the other one with duct tape on the inside of the box to cover the intake of the fan. This will protect the housing of the fan from getting carbon particles in it.

    • 6

      Fill the box with the carbon. Spread it evenly throughout the inside of the box.

    • 7

      Tape the box shut. Make sure there are no holes.

    • 8

      Mount the box over the top of the hydroponic growing area, or install in front of the existing exhaust system with screws.

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