After remodeling the five story E. B. Wilson apartment build- ing in Tacoma, Washington, the Tacoma Housing Authority faced a major problem. Flue gases from two new boilers, installed during the renova- tion, were being direct vented out the side wall and sucked into six adjacent apartment units through windows and a ventilation system. The apart- ments were unlivable and un- rentable. The Authority's engi- neers came up with a solution: reroute

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