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One of the ways to reduce the vibration is to mount the fan on a piece of plywood, and hang the wood from the ceiling on stout cords a few inches long. A flexible ductwork is constructed to pump the exhausted air into the ceiling. Gardeners monitor heat and humidity levels by using thermometers to measure temperature and hygrometers to measure relative humidity. The desired ranges are: Temperature: The best range is above 85 and below 95 degrees Fahrenheit with CO2 injection especially with white widow feminized. Some experiments indicate that maximum growth rate occurs at around 95 degrees with CO2 at 1500 ppm. There are other experiments that indicate that CO2 enhancement does not do much for the growth rate below 75 degrees. It is also recognized as a good practice to keep the temperature below 85 degrees if the ambient air is being used without CO2 enhancement.

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