13th
July
2016
Maintained by me
For more than three decades, I lived in my house and accepted that there was a mystery black box in the attic. At least, I think it was black. Never actually saw the unit, much less inside of it. When I activated a certain control on the wall, a fan noise could be heard, and my neighbours mentioned their “air exchanger” with a matter of fact tone. I assumed that it was something more complex than an open door or window.
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