Right now I'm installing gas appliances throughout my residence and I'm deciding between flexible gas hoses for all connections. Flexible gas hoses receive widespread praise for their utility but I remain concerned about their long-term performance and security attributes. What established guidelines exist to set up flexible gas hoses while preserving both their efficiency and safety? When buying flexible gas hoses does it matter which materials and certifications need consideration? Please provide recommendations for maintaining flexible gas hoses properly including guidance on leak detection. Please share your insights with personal examples from your experiences.