Photo 1 of Vent Systems 4" inch to 3" inch Duct Reducer Adapter Connector Fitting Pipe Increaser Reducer Cone for HVAC, Ventilation Systems, Exhausts and Grow Tents. Metal 100 to 80 mm

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Photo 1 of Vent Systems 4" inch to 3" inch Duct Reducer Adapter Connector Fitting Pipe Increaser Reducer Cone for HVAC, Ventilation Systems, Exhausts and Grow Tents. Metal 100 to 80 mmPhoto 2 of Vent Systems 4" inch to 3" inch Duct Reducer Adapter Connector Fitting Pipe Increaser Reducer Cone for HVAC, Ventilation Systems, Exhausts and Grow Tents. Metal 100 to 80 mm