User talk:81.99.21.178

Neglected by modern architects in the latter half of the 20th century, the early 20th century saw them used again, to increase ventilation and cut power demand for air-conditioning.[3] Generally, -- This doesn't make sense or doesn't read correctly. Either they were used in the early 20th century and then ignored. Or it meant to say the 19th Century, or 21st Century. DJ Smiley (talk) 19:47, 21 August 2020 (UTC)