Soon I will be installing ducting for my 2HP extractor (generic). It will have to be 6" pipe because the Hammer thicky runs on 5" flexy and there is no 5" drainage pipe available.
Last summer was the first I had using the DE and I found it necessary to walk the 5" flexy under the gable every 45 minutes or so to remove the hot air (even with aircon the hot layer starts at the shoulders and just gets worse towards the scalp :B).
So, I'm thinking that when I run the ducting for the various machines I'll also run a pipe down the length of the gable with holes drilled into it, and gated. That will make the process far superior.
The question is: what diameter pipe to run along the gable? 100mm? 60mm? 50mm? I intend to drill smaller holes where the gable run meets the trunk (in the middle of the gable run), and expand the hole sizes as I get towards the end. I will probably be forced to use 100mm pipe running out of the trunk to join up to the gable run, so 100mm will be the choke point. Some quick calculations show:
150mm dia has Xsectional area of 177 cm²
100mm dia has Xsectional area of 79 cm²
A series of 8 holes either side of the middle (so 16 holes altogether) in the following diameters will yield a Xsectional area of 82cm² (which is compatible with the 100mm choke point):
That would place the holes about 30cm apart on a 5m run.
Current thinking is to have the holes on the top of the gable run pipe to reach the maximum temp air - should pull up the layer underneath as the hottest air is removed.
So, is that the best way to go or are there other ideas please?
Last summer was the first I had using the DE and I found it necessary to walk the 5" flexy under the gable every 45 minutes or so to remove the hot air (even with aircon the hot layer starts at the shoulders and just gets worse towards the scalp :B).
So, I'm thinking that when I run the ducting for the various machines I'll also run a pipe down the length of the gable with holes drilled into it, and gated. That will make the process far superior.
The question is: what diameter pipe to run along the gable? 100mm? 60mm? 50mm? I intend to drill smaller holes where the gable run meets the trunk (in the middle of the gable run), and expand the hole sizes as I get towards the end. I will probably be forced to use 100mm pipe running out of the trunk to join up to the gable run, so 100mm will be the choke point. Some quick calculations show:
150mm dia has Xsectional area of 177 cm²
100mm dia has Xsectional area of 79 cm²
A series of 8 holes either side of the middle (so 16 holes altogether) in the following diameters will yield a Xsectional area of 82cm² (which is compatible with the 100mm choke point):
| Hole dia/mm | AREA cm² |
| 10 | 0.79 |
| 12 | 1.13 |
| 15 | 1.77 |
| 20 | 3.14 |
| 25 | 4.91 |
| 30 | 7.07 |
| 35 | 9.63 |
| 40 | 12.57 |
That would place the holes about 30cm apart on a 5m run.
Current thinking is to have the holes on the top of the gable run pipe to reach the maximum temp air - should pull up the layer underneath as the hottest air is removed.
So, is that the best way to go or are there other ideas please?
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