Filter models and features

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Dear friends, I am studying* (Petrochemical Plant Process Pipeline Installation Design Manual) Part 2 (Pipeline Equipment), when I learned about the filter section, I found the following problems, please help me friends: 1. Mesh filter: The filter screen of the mesh filter is composed of two layers, the inner layer is ø2.2 No.5, and the outer layer is 16 mesh/in. What is the concept of ø2.2 No.5 here? 2. Mesh filter and basket filter models: Mesh filter model: MRI100 MRI150 MRI200.......... Basket filter model: Pass-through basket: SRBA Flat Structure ； SRBA1 head structure high and low nozzle basket type: SRBB flat structure ； SRBB1 head structure, high and low nozzles, overlapping basket type: SRBC Please tell me, what does MRI and SRB have to say here? What is the abbreviation of the word, or is it just the model number without any explanation? How should I understand it? 3. The above filters also include SBL--I type, SBL--II type, SBL--III type, etc. How do you understand SBL here? Thanks!