Way to go Gerhard! See pages 17 through 19 of the APSF article posted by Al above.
I will have to study up on Category 1 Dental WAGD being supplied from the Dental Vacuum system in the chart on page 18. My interpretation of the following does not support that.
15.3.2.1.8 WAGD Systems. Category 1 systems shall comply with 5.1.3.8, except as follows:
(1) Medical WAGD pumps shall be permitted to be simplex.
(2) The facility staff shall develop their emergency plan to deal with the loss of WAGD.
15.3.3.6.1.1 The use of scavenging shall be limited to portions of dental facilities where moderate or minimal sedation is administered. WAGD shall be provided where the dental treatment involves general anesthesia or deep sedation.
15.3.3.6.1.3 Nitrous oxide scavenging inlets shall not be interchangeable with any other vacuum inlets, including medical surgical vacuum, dental vacuum, and WAGD.
This sounds to me like a separate WAGD system is required for Category 1 Dental applications.