Successful indoor gardeners know that a vent fan is as important as water, light, heat, and fertilizer. In some instances it is more important. All greenhouses have large ventilation fans. It is sometimes said that the person with the most fans wins.
Vent fans are rated by the number of cubic feet of air per minute (cfm) they can replace or move. Buy a fan that will replace the volume (cubic feet) of the grow room air in about 5 minutes or less. The air that is pulled out is immediately replaced by fresh air which is drawn from little cracks under the doors or window sills. If a grow room is sealed tightly then an intake fan will probably be necessary to bring in fresh air.
A vent fan is able to pull air out of a room many times more efficiently that a fan is able to push it out.
To calculate the room size multiply width by height this will give you the total cubic footage of your room for example 10 by 10 by 8 = 800 cubic feet. Remember that you want your fan to exchange the air within 5 minutes so for a room that is 800 cubic feet a fan that is capable of moving 160 cfm is needed.
Vent fans are rated by the number of cubic feet of air per minute (cfm) they can replace or move. Buy a fan that will replace the volume (cubic feet) of the grow room air in about 5 minutes or less. The air that is pulled out is immediately replaced by fresh air which is drawn from little cracks under the doors or window sills. If a grow room is sealed tightly then an intake fan will probably be necessary to bring in fresh air.
A vent fan is able to pull air out of a room many times more efficiently that a fan is able to push it out.
To calculate the room size multiply width by height this will give you the total cubic footage of your room for example 10 by 10 by 8 = 800 cubic feet. Remember that you want your fan to exchange the air within 5 minutes so for a room that is 800 cubic feet a fan that is capable of moving 160 cfm is needed.
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