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What size exhaust fan do I need for my grow room?

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What size exhaust fan do I need for my grow room?


A grow room is utilized to house plants so they develop efficiently in a controlled environment. Producing the perfect growing conditions needs cautious monitoring of the available light and heat sources

What size exhaust fan do I need for my grow room?

If you are running with hot HID grow lights you will want to change the air within the grow room once a min for optimal results.

take a tape and measure (in meters) the length, width and height of your grow tent– this will provide you the cubic area of the tent then multiply this figure by 60 (the number of minutes in an hour) which is how many times you desire the area exchanged in a hour

below’s an example:.

grow room is 1.2 M x 1.2 M x 2M.

1.2 x 1.2 x2= 2.8 cubic meters in total.

2.8 X 60 =172.8 cubic meters an hour needed.

and right here’s a quick approximate guide to the size of fan for exactly what size area you are growing in.




4?/100mm – 175m3/hour
5?/125mm – 225m3/hour
6?/150mm – 420m3/hour
8?/200mm – 750m3/hour
10?/250mm – 1000m3/hour
12?/315mm – 1300m3/hour

However!  any 90º bend in the ducting means that you will need to add a 30% power increase due to resistance –

Using the first example ad adding a 90º bend would be:

172m3 X 1.3=223.6m3

so in effect a 5″ extractor is ideal



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