View source for Earth Tubes II

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'''Requirements'''
* 750 cfm
* max 7 ft/sec
* 80 feet long
* affordable
'''Design / Selection'''
* Ideas
** reach volume / price balance
* Design
** 6 - 6" pvc tubes ... actually 2 more were placed for the earth room 
** Location: backyard
** Length: +/- 80 ft
** Speed = 10.6 ft/sec @ 750cfm 
** Chimney
*** use new corrugated steel bolted to building (no foundation needed)
*** Manifold and filter on top.
*** Ladder to roof (need for other purposes)
** Needs a bypass?
** Collect condensation in building in barrels for watering plants inside.

'''Rationale'''
* Connectedness to the earth
* net zero-energy
* simplicity