https://www.se.com/mx/es/faqs/FA128312/
Does the NQ442L4 400 amp panel require a vented cover? | Schneider Electric Mexico
Issue:400 amp NQ or NF panelboard requires a vented coverProduct Line:LV PanelboardsEnvironment:NQ or NF PanelboardsResolution:Yes, all 400 amp panels require...