Green Building Bible ((both volumes) fourth edition) These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.
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Hi Chris- Can't argue with you there, the 240v one does seem surprisingly higher m^3/hr in free air given the similar power rating. As to which is best with around 50Pa pressure drop across it, I couldn't say. If you do get the RS one, be prepared to end up taking the finger guard off to fit a cowling closer to the fan blades.
I made a 400mm diameter 400mm length, tube out of stiff material to help make the airflow uniform before measuring airspeed. This was placed inside the house around the fan (which was blowing to outside, depressurising the house), then I found airflow was easy to measure, and it was easy to calculate the flowrate.
Tim - Mrs RobL shuddered when I showed her three fans in your door - it brought back memories she'd rather forget!
I think I was just searching for EBM Pabst fans (maybe EC) - I was looking for one for work (a computer room free-air cooling project). I did get very lucky with these (job lot of 4, for £20 - I was sole bidder), as RS has a similar model for > £300 each. Have only seen one similar come up since (and that in the US). They are W3G400-CA22-71:
At full power, they do 5500 m^3 per hour in free air, 350 Pa at zero-flow. They have their own internal speed controller, and a single 0-10k ohm pot controls all three at the same time.
Once the bay window roof is blocked up on Monday, I'll probably only need one of them.
It's probably best to look for a fan which has a high static pressure, rather than high m^3 per hour (unless you suspect you have hundreds of tiny leaks I suppose), as when you block holes up, the pressure (at full power) will rise, allowing you to find smaller ones more easily.
Just thought I'd bump this thread as I need to do a confidence test shortly to confirm that the structure is sufficiently sealed without a separate air tight layer.
BTW, have ordered one of the Wizard Stick (as sold by EBS etc. for the best part of a ton) hand-held smoke machines on eBay from the US. Will give a review when I get it:
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