diff --git a/SolidProcess.lua b/SolidProcess.lua
index 4a65abd..f1c0347 100644
--- a/SolidProcess.lua
+++ b/SolidProcess.lua
@@ -1,4 +1,4 @@
--- 2021/03/18
+-- 2023/08/24
 -- Parti solide gestite come travi BTL
 
 
@@ -16,8 +16,8 @@ local function SolidMinBox( nId)
    local refMin
    local b3Min
    for i = 1, nFacCnt do
-      local refFace = EgtSurfTmFacetMinAreaRectangle( nId, i - 1, GDB_ID.ROOT)
-      if refFace then
+      local refFace, dL, dW = EgtSurfTmFacetMinAreaRectangle( nId, i - 1, GDB_ID.ROOT)
+      if refFace and dL * dW > 100 then
          local b3Box = EgtGetBBoxRef( nId, GDB_BB.STANDARD, refFace)
          if b3Box then
             local dVol = b3Box:getDimX() * b3Box:getDimY() * b3Box:getDimZ()