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Originally Posted by pinballlooking
Have the fan push or pull the air.
Flexible or ridged duct.
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I have been
experimenting with moving hot air from ceiling down into a room. I found it is better to have the fan at the lower level and suck air down. Having a fan at ceiling level and pushing air down produced less air flow, although that may depend on fan design.
A rigid duct would be better because the concertina type flexible ducts disrupt air flow a lot, which limits throughput. Also it is easier to make a rigid duct larger and volume is important. I think any given fan will move more air if the duct is larger.
However, I would not do it the way you propose. I would mount the heat exchanger near the roof so that it is not necessary to move hot air down to it. I think that will be more efficient, simpler, and more reliable. The extra few feet of water pipe will not be a problem re heat loss. You just have to be sure your pump can cope with the extra head.
Quote:
I have this to help purge the air
1/2" Brass Automatic Air Vent Valve High Temperature
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I have used that type of valve and they worked well for me.