Current mesh we are planning to buy:  

• https://www.amazon.com/AggAuto-Universal-Grill-Mesh-Multifunctional/dp/B08PBM1C2F/ref=sr_1_5?keywords=Mesh%2Bfor%2BCar%2BGrill&qid=1686425883&sr=8-5&th=1 
• 12mm x 6 mm rhombic holes 

Water resistant mesh or coating? 

Dust resistant mesh:  

• https://www.amazon.com/Black-Speaker-Stereo-Fabric-Repair/dp/B07F3YS99J/ref=sr_1_8?crid=1BXPNH359JFN3&keywords=hydrophobic%2Bmesh&qid=1701556464&sprefix=hydrophobic%2Bmesh%2Caps%2C108&sr=8-8&th=1 
• ^possible, not sure if it is good though