One of the most overlooked environmental factors affecting indoor plant growth is airflow. Good air flow assists temperature control, CO2 replenishment, reduces humidity and lowers the occurrence of certain diseases as air movement across the plants assists photosynthesis and transpiration which plays a major role in calcium transportation, preventing blossom end rot and tipburn in certain plants. One of the most effective methods of cooling a room is by having good ventilation and airflow drawn in from outside and vented out again.
Horticultural extractor fans are used to remove warm stale air from grow rooms. An extractor is essential for the maintenance of an optimum growing environment. The constant removal of stale air will lower the humidity and maintain higher CO2 levels.
If an adequate input of fresh air is not maintained then plant growth will virtually ceases. Most plants species will grow most effectively in the temperature range of 20 - 28 Degrees Celsius, so the mid twenties would be optimal.
It will not be difficult to maintain this sort of temperature in your room whilst the lights are on as they are a great source of heat and as well as light. If the temperature becomes too high, a simple extractor fan should serve to reduce it. This extractor can be easily linked to a thermostat to ensure that your room never reaches the high temperatures that can have a negative effect on growth rates.
source : hydroponic
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