When cyanide solution is utilized inside an enclosed structure, an audible and visual HCN warning device shall be installed and set to activate at an HCN concentration of 10 ppm.
Ariz. Admin. Code § R11-1-2218
When cyanide solution is utilized inside an enclosed structure, an audible and visual HCN warning device shall be installed and set to activate at an HCN concentration of 10 ppm.
Ariz. Admin. Code § R11-1-2218