How to set up an indoor grow light cooling fan

Written by lea saray
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How to set up an indoor grow light cooling fan
HID bulbs produce for more light than incandescent bulbs, but far more heat. (light bulb image by Zbigniew Nowak from Fotolia.com)

One of the most common problems with indoor gardens is heat generated by high intensity discharge lights. (HIDs) The most common way to cool these lights is through a duct system with a blower fan or an inline fan. Special reflective hoods house the HID bulbs and fans force air through ducting across the bulb, thus cooling the light. By cooling light bulbs this way, a growing area can drop by more than -12.2 degrees Celsius. Installing a ventilation system is a simple process that can be accomplished by one individual in a few hours.

Skill level:
Easy

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Instructions

  1. 1

    Map the area. Decide where the grow light will hang and where fans will be placed. The fan will need to be attached to something capable of holding its weight. Ideally the mounting location would part of a wooden frame into which anchoring screws can be drilled. Also determine where the intake and exhaust will be placed. The exhaust will be hot air so it is best vent it outside or away from the indoor grow area.

  2. 2

    Hang the light. Follow the light manufacturer's directions for mounting and hanging your lighting fixture.

  3. 3

    Mount the fan. Screw the fan into frame work using as large of screws as the frame will allow. To reduce noise vibration, install rubber grommets between the frame and the fan on each screw.

  4. 4

    Mount the fan. Screw the fan into frame work using as large of screws as the frame will allow. To reduce noise vibration, install rubber grommets between the frame and the fan on each screw.

  5. 5

    Install duct work. Cut one length of ducting to go from the intake flange to the light fixture. Use clamps to tighten each end of the ducting. Cut another length to go from the light fixture to the intake of the fan and use clamps to tighten. Attach a final length of ducting going from the exhaust of the fan to the exhaust flange. This will suck cool fresh intake air across through the light fixture and out the exhaust flange.

  6. 6

    Tape the ducting around the clamps to ensure that the ducting is air tight. It is best to use reflective duct tape liberally.

Tips and warnings

  • Use two fans for maximum cooling power. Use a smaller one for intake and a larger one for exhaust to create the best suction.
  • Leave slack in ducting to allow the light fixture to be moved up or down.
  • The more twists and turns in the ducting the less effective the system will be. Design your system with as few curves as possible
  • If light going through ducting is an issue, add a single loop in the ducting to trap any light travelling through the system.

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