fan prices

Ventilation is as important as lighting in an indoor situation.

Seriously.

Leaving a window open and putting a fan near it has not worked in my experience. It has barely kept the plants alive mostly.

CO2 makes up the bulk of the plant cell structure, is the only source of carbon, and every molecule of organic matter must contain carbon.

Here is how you work out fan power.

Work out your room size. e.g. a 3m x 3m x 2.5 m high room is 3x3x2.5=22.5 cubic meters (m3)

Please be aware that if you have a room that size, and you only have a 400 watt light, then the area you are growing in is 1m x1m. If you hang panda (black and white ) plastic as a curtain around that 1m x1m area, you only need to ventilate that area. i.e. 1m x 1m x 2.5m = 2.5 cubic meters. Image how much fan power you can save! If you don't hang the curtain, then you will have to ventilate the area. The plastic helps reflect light onto the plants and into the undergrowth, so your mad not to anyway....
(Panda film (3m wide) is currently $6 per meter off the 3m wide roll.)

If you have Air-conditioning/heating and temperature is thereby not a problem, then you need the air changed 10 times every hour.

(note on air-conditioning, don't blow freezing air directly on plants as it has the same reaction if I stick you in a freezer. Use a deflector to send cold air up, to mix it up in the room over the top of the plants and the cold air will descend over the plants.)

If you don't have climate controlled, then you need to change the air 60 times per hour. beware temperature extremes, such as below 10 degrees Celsius overnight, and over 35 degrees during day. Optimum is around 23 to 26 degrees, but you need heating/cooling if the temperature gets too extreme. Consider insulating grow room against heat of sun/cold of night....

Check fans are continuously rated or they may fail, make heaps of noise, seize up and spray oil over the room and plants, and or all of the above..... example - ordinary bathroom fans designed to work for a few minutes per day.

click for larger image	continuously rated fan 120mmx120mm fits into 150mm ducting 100-140m3 hour. $40
click for larger image	Fan 250mm blade, continuously rated, 3 year warrenty, suits up to 3 meters of 300mm ducting, 600 m3/hr, mounting hook to hang fan in growroom. $55 If you mount a fan in a wall sound travels in the wall and is amplified throughout the building. Suspended fans can be hung above a light, and ducting can take the air out of the room through a window or ceiling.
click for larger images	Fan 150mm, continuously rated, suits up to 12 meters of 150mm ducting, 600 m3/hour, mounting hook to hang fan in growroom. $160
click for larger image	Industrial Fan, German motor, continuously rated, suits up to 12 meters of 300mm ducting, 250mm, 2500 m3/hr, Standard quiet fan, $290 300mm, 2500 m3/hr, Standard quiet fan, $310 250mm, 3500 m3/hr, Louder and larger capacity fan, $360 300mm, 3500 m3/hr, Louder and larger capacity fan, $380
click for larger image	Oscillating Fans If the air comes in one fan, out the exhaust but isn't blown into the plants, plants sometimes exhibit the same problems as if you never installed ventilation. $30.
click for larger image	To fill the hole in the ceiling, bathroom fan BUT!!!! it is continuously rated. 250mm $50
click for larger image	Ducting for fans
	150mm	3m $18	6m $33
	250mm	3m $24	6m $45
	300mm	3m $30	6m $50

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