We are lucky to have wonderful local excavators to level and shape the grounds beautifully as they filled in and around the foundation. Their skill made the job of arranging the layers of piping much easier. (Tall dog for perspective)
4 inch tile drainage pipes (with socks) were attached into the 12 inch plenum at each end.
14 pipes were installed in two layers, staggered.
The potting shed was backfilled with gravel while the greenhouse was subsoil and 14 inches of topsoil.
The vertical pipe in the North East corner (right) is the intake. Air flows out of the shorter pipe in the South West corner.
