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Reply with quote  #31 
Dbc-if you're referring to my drawing. It's a small ZP ARETHA I built for my hot tub. It works pretty well. I modified the drawing for a straight air collector. As it has two (short) air channels it has very little backpressure.

Thread is here: https://simplysolar.supporttopics.com/post/willies-zp-aretha-8407113?trail=10&highlight=willie%27s+zp

I had problems at first because the heater core presented too much resistance for the fan. That wouldn't apply in an air collector though.

Willie, Tampa Bay

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