Pipe-applied atmospheric-type vacuum breakers shall conform to ASSE 1001 or CSA CAN/CSA B64.1.1. Hose-connection vacuum breakers shall conform to ASSE 1011, CSA CAN/CSA B64.2, ASSE 1019, CSA CAN/CSA B64.2.2, ASSE 1035, CSA B64.7 or ASSE 1052. These devices shall operate wider normal atmospheric pressure when the critical level is installed at the required height.