Product Type Venting For Gas Heaters Compatible with Product Type Unit Heaters Compatible Grainger Part Number 55GY96 Compatible Mfr Model Number 11HU200A1NS1110A Opening Width 3 in Opening Depth 3 in Mounting Type Surface Vent Direction Horizontal or Vertical Vent Diameter 3 in Vent Size 3 in Vent Type Intake/Vent Concentric Y Material PVC Outer Diameter 3 in Includes Air Inlet Pipe Combustion Air Inlet Cap Flue Pipe Intake/Vent Concentric Y Standards ETL