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greenhouse exhaust fan speed controll #207013
09/14/12 03:49 AM
09/14/12 03:49 AM
jackolsen  Offline OP
Joined: Feb 2008
Posts: 21
british columbia canada
my wife just had green house built 16x20 ft i would like to control the tempeture in the greenhouse with the help of
a exhaust fan about 4000cfm would a vfd work and how do i controll the speed with a stat ?the motor would be about 0.5hp any one know what is the best way to do this

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Re: greenhouse exhaust fan speed controll [Re: jackolsen] #207021
09/14/12 08:30 PM
09/14/12 08:30 PM
gfretwell  Offline

Joined: Jul 2004
Posts: 9,185
Probably the easiest way is just a regular stat with a relay.

Greg Fretwell
Re: greenhouse exhaust fan speed controll [Re: jackolsen] #207027
09/15/12 05:01 PM
09/15/12 05:01 PM
Alan Belson  Offline
Joined: Mar 2005
Posts: 1,803
Mayenne N. France
Get an automated light [window] opener, it works for free. A fan will remove plant food, [ good old carbon dioxide ] and force entry of a plethora of disease spores and spider-mites, apart from the cost of running a fan. A timed/sensed watering distibutor/mats will be better way to improve your glasshouse. I use bagged compost, not soil, and use it to pot flowers up the next year, third year as a soil improver. My little 8x6 produced 13 cantaloupe melons this year, plus 2 cucumbers a week and more tomatoes than we could eat. Best of luck next year and good eating!

Last edited by Alan Belson; 09/15/12 05:04 PM.

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