... in ventilation ducts to control differential pressure and monitor AE-6021 series pressure controllers are used as a flow switch ... operationMaximum airflow control for volume systemBurner air controlOrdering CodeModel DescriptionAE-6021-30 ADP switch with mounting bracket and tubing, 30~ ... ADP switch with mounting bracket and tubing, 50~500PaAE-6021-100 ADP switch with mounting bracket and tubing,100~ ...