🔍 Key Concepts

• 46 CFR requirements for flame screens on fuel tank vents and similar openings • How mesh size (wires per inch) affects the ability to stop flame propagation • Differences between single vs. double screens and brass vs. stainless steel in regulatory language

💭 Think About

• Compare each option’s mesh size with what you remember from the CFR table or definition of an acceptable flame screen. Is a higher mesh number always better, or is there a specific range? • Think about why some regulations specify either a single screen of a certain mesh OR two coarser screens spaced apart. Which combination most closely matches that idea? • Consider whether the material (brass vs. stainless steel) is what the regulation focuses on, or whether the mesh size and arrangement are the controlling factors.

✅ Before You Answer

• Verify what 46 CFR says about acceptable flame screen construction (mesh size and configuration) for fuel tank vents or similar openings. • Check if the rule allows single screens only, or if it also recognizes double-screen arrangements as acceptable. • Confirm whether the regulation specifies minimum mesh (wires per inch) rather than just the material type.