I saw this DIY video, and was wondering if such a fan could be run before shabbat started and left running as shown?

The video on this page (Ignore the article):


Question is in theory only, I have no plans on building such a fan.

Original link was based on the following embed code:

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  • 1
    Your link doesn't work... Sep 11 '11 at 13:07
  • Would this plan require refilling the water tank?
    – yydl
    Sep 11 '11 at 13:44
  • yydl, good question. I'm not sure :) Maybe assume yes, no, and only refilling it before it's empty?
    – avi
    Sep 11 '11 at 14:13
  • Basically the apparatus circulates what starts as ice water round a fan inside copper tubing. The water is not used up. It will of course slowly get warmer and end up at room temperature. I see no issur shabbos as long as the fan was started before Shabbos. Am I missing somnething? Sep 11 '11 at 15:16
  • The water goes into the plants after being sucked up by the fan. Or atleast, something wet goes into the plants.
    – avi
    Sep 11 '11 at 16:34

If your concern is the watering of the plants that will occur during Shabbos, that is not a problem, since the system was set up before Shabbos. This is taught explicitly in Shabbos 18a regarding the similar case of opening a water channel into a garden before Shabbos. Refilling the reservoir on Shabbos is a more difficult question, and probably depends on whether the watering of the plants is a certainty (פסיק רישא), and whether the person cares or benefits from the watering.

  • According to that video, they obviously do not care to water the plants, they just don't want the water 'in the house'. There is a small chance that the pipe has a leak and not all the water will go directly to the plants.. It is a DIY project :) Does it matter if they refill the water before it empties out?
    – avi
    Sep 11 '11 at 20:16

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