Show notes
It’s hard to miss the four brick stacks of the Liberty Tunnel Fan House towering over the houses on Secane Avenue in Mount Washington. “There are two exhaust shafts,” said Bill Lester, Assistant Director of Construction for PennDOT’s District 11, pointing them out. “And there are two intake shafts where we draw fresh air in from up here. We push it down into the tunnel and then we turn around and we drag the bad air back out.” The fan house is the beating heart of the Liberty Tunnel: that