A trap-door opening at the top of the house allows for better circulation.  Photo 6 of 12 in Dwell October 2008, Vol. 08 Issue 10: Home Savings by Dwell from Magic Mountain

Dwell October 2008, Vol. 08 Issue 10: Home Savings

6 of 12

A trap-door opening at the top of the house allows for better circulation.

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