Can anyone help me find an online supplier, or shop in the Glasgow/Lanarkshire area, which sells fine steel mesh.
I do a lot of system building, and find that, in a lot of cases (usually the cheaper types), that the mesh does not stop larger spots of dirt/dust, getting into the system, and a finer mesh, usually results in a P.C. being cleaned out only once or twice a year, instead of the three or four times normally.
Very fine mesh will reduce the air flow rate even when it's clean, and certainly when it has accumulated a layer of dust. That will lead to the inside of the case being improperly ventilated, and overheating could occur.
Central heating suppliers (good wholesalers)will stock proper air filter material which is used on warm air units.I know from experience these work well without restricting the passage of air.It is what it is designed for and is sold by the yard.