Part # 405A - COVERED SPEAK THRU.
Screened Opening for Insect Free Environment 4 inch and 6 inch (102 and 152 mm) Models Available in Two Finishes, Choice of Metal or Lucite Cover.These heavy duty units are available in satin anodized or duranodic bronze finishes. Both 4 and 6 inch (102 and 152 millimeter) sizes are made to be glazed in 1/4 inch (6 millimeter) glass. The four inch (102 millimeter) model requires a 3-1/2 inch (89 millimeter) diameter hole. The six inch (152 millimeter) model requires a 5-1/2 inch (140 millimeter) diameter hole.