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Thread: Large ceiling fan for shed
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28th Nov 2021, 06:52 PM #16Most Valued Member
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I’m seeing an electric punkawallah project in your future
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28th Nov 2021, 08:04 PM #17Diamond Member
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29th Nov 2021, 09:10 AM #18Most Valued Member
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Steve i have a secondhand evap cooler on my shed, I use it to clear fumes with the roller door up and for cooling i only open the rollerdoor a foot or 2, it drops the temp in the shed by about 10 degrees.
I have no ducting so i use a pedistal fan underneath the cooler and point that to where i want more concentrated cooling, Some people have stated that evap coolers will cause rust but i have seen no evidence of this.
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29th Nov 2021, 10:55 AM #19Senior Member
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We installed 2 of those 7m fans in the warehouse where I worked. Yes only small motor but a good sized gear box.
They worked very well but again problem is you are only moving the same air and we found once the ambient temp rose then they lost their benefit.
When we cleared the building when factory closed no one wanted then so they ended up in scrap skip.
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29th Nov 2021, 01:24 PM #20Diamond Member
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29th Nov 2021, 08:06 PM #21Most Valued Member
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My son got my evap cooler and fitted it, he was a plumber and worked in heating and air conditioning.
I remember seeing a huge pile of evaps behind the business where he worked that had been replaced with new models. The one that he got me just didn't make it to the old and rejected evap pile. If you have a heating and air con place nearby it might be worth a look around the back but from memory it didn't cost that much to have a new one fitted to the house and you wont be needing ducting or vents cut in so that would cut the price down also.
When you get a s/h one you have to add on the price for new pads, they can be pricey depending on where you get them from, i got new pads for the house and shed coolers last year at a cost of ummmmm??? 5 or 600 bucks for the 2 coolers.
There is no insulation in my shed other than the insulation foil under the roof sheets that doesn't really insulate, i think the main benefit of that stuff is that it stops it raining in your shed when the sun hits the roof on a frosty morning.
My shed is 12 x 9 and has a 3 mtr wall height, a lot of sheds only have 2.4 mtr or maybe even lower and they are torture to work in on 40 + days, with a bit higher wall height and a fan it is much more manageable, with the evap cooler it is heaven.
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29th Nov 2021, 09:04 PM #22Diamond Member
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6th Dec 2021, 09:27 PM #23Diamond Member
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Its Shedhappens fault.....really....
Got it for $500 and the pads look pretty good.Got the Dropper with it as well, so just need a Plenum(?)
No ducting....don't need it.
20211206_154427.jpg 20211206_154437.jpg
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7th Dec 2021, 12:00 AM #24Most Valued Member
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Does this mean no electric punkawallah?
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7th Dec 2021, 12:00 PM #25Diamond Member
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7th Dec 2021, 10:04 PM #26
Yes turning the fan to the swampy on when sweeping the floor is a good idea. Does a good job of clearing out dust at the shop.
Frisky wife, happy life. Then I woke up. Oh well it was fun while it lasted.From an early age my father taught me to wear welding gloves . "Its not to protect your hands son, its to put out the fire when u set yourself alight".
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11th Dec 2021, 05:24 PM #27Diamond Member
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Have been scouting for the rest of the parts I need. New prices are outrageous , especially for 4 way Plenum. $381!
I saw them in the UK for £32!
I found a guy who sells S/H aircon parts so will see what his prices are like.
A Plenum:
Breezair Plenum.png
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12th Dec 2021, 09:36 AM #28Most Valued Member
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Steve I thought about putting a diffuser or something like the plenum that you have pictured but I thought i would see how went without one, it works ok without one but I think it would probably move the hot air near the roof better so that would help, plus if you have a shop it looks neater, i have a messy workshop so neatness is not on the agenda here.
On a real hot stinker of a day everyone that comes into the shed goes and stands under it, its like standing under a waterfall. It would be simple enough to make your own plenum and incorporate a waterfall trapdoor into the bottom of it.
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12th Dec 2021, 10:09 AM #29Member: Blue and white apron brigade
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I seem to recall that way back one of the WWF members made his own plenum just out of plywood as he doesn't run any water though his.
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12th Dec 2021, 11:05 AM #30Diamond Member
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In my very much younger days I had a holiday job at Edgells in Bathurst N.S.W. During my time there we installed some air conditioning which ran off the plant ammonia based refrigeration infrastructure. There was quite a lot of duct work to be run, and we made it all from polystyrene sheet about 25 mm thick, set in a frame of aluminium angle, about 50 x 50 x1 mm from memory. Each section of ducts about 2400 mm long, most likely the longest length of sheet p/s foam available, and the ducts would have been about 750 x 600 mm cross section. We cut the sheets as needed with a hand saw, butt glued the joints and duct taped them, and ran the ally angle down the corners, and made end flanges from ally angle as well. pop rivets secured all the joints, I don't recall how we sealed the flange to flange joints but I guess it was either mastic or RV silicone with more pop rivets. I remember it being so simple and quick to fabricate and install, each length of duct was easily handled by one person, and on one occasion we had to run the duct with a part of chord of a truss penetrating it. We just built that section in place, cutting and shutting the foam sheet to suit. It was so easy, and it sealed up without any leaks, and I remember thinking at the time, how much harder it would have been if we had done it in sheet metal.
You could knock up a plenum in similar fashion, but if you wanted one like the one pictured, you would have to make your own angle, to suit the design shape you were building, — anyway some food for thought.
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