Greenhouse: Harbor Freight Automatic Vent Opener, 1 by Ric_of_MAF
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Image Copyright Ric_of_MAF
In reply to: Harbor Freight Automatic Vent Opener
Forum: Greenhouse
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Ric_of_MAF wrote: Oh, I forgot the pic of the vent fan with tube BTW you can construct a temp alarm by using a thermostat that can be adjusted down to 40*F or so, a battery pack/power supply, a doorbell and some thermostat wire. Easy to set up, not expensive, and gives you a chance to add alternative heat source. |