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Our building at work has 100% fresh air when in the occupied mode.
There is a massive heat wheel system to recover heat from the exhausted air.
The new(er) buildings at work were all built to this standard but the older buildings are still in the stone age when it comes to heat recovery and ventilation standards.
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Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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