Page "Green wall" Paragraph 10

There is some discussion also around " active " living walls.

An active living wall actively pulls or forces air through the plants leaves, roots and growth medium of the wall and then into the buildings HVAC system to be recirculated throughout the building.

A problem with these systems is that building code still requires that all the standard air filtration equipment that would have to be installed anyway, despite the living wall's installation.

This means that active living walls do not improve air quality to the point that the installation of other air quality filtration systems can be removed to provide a cost-savings.

Therefore, the added cost of design, planning and implementation of an active living wall is still in question.

With further research and UL standards to support the air quality data from the living wall, building code may one day allow for our buildings to have their air filtered by plants.