- Author: Steven A. Tjosvold
The previous blog post explained how moving air helps maximize photosynthesis by increasing the ambient CO2 diffusion into the leaf. The trick is to efficiently move air around the greenhouse so that can happen.
Since 1967, when the Horizontal Air Flow (HAF) concept was introduced by Dr. Jay Koths, from the University of Connecticut , it has become the standard method for air circulation in greenhouses. Over the years, changes to fan design, installation techniques and efficiency have brought some improvements to the original design. But the HAF concepts and benefits have not changed at all. I scanned one of the original newsletter articles that Dr Koths wrote in 1985 (available below). It explains the concepts and practical design features as well as anyone ever could.