Building ventilation invented by ancient Persians and Romans is making a modern comeback

Building ventilation invented by ancient Persians and Romans is making a modern comeback

The Big Picture: Where are the monarch butterflies now?

Canadian electric locomotive built to work in –40 C winters

Building ventilation invented by ancient Persians and Romans is making a modern comeback

A solar chimney runs almost from the bottom to the top of the east face of Limberlost Place, George Brown College's new mass timber net-zero building in Toronto. (Emily Chung/CBC)

A 10-storey wood building is a striking sight. But beyond the mass timber construction and rooftop solar panels, the biggest sustainability features of Limberlost Place, the new net-zero building at Toronto's George Brown College, are ones you may not have heard of — solar chimneys.

They're a modern version of a tech