Burner Grills - Amana Furnace

What is the purpose of the wire grills located in each of the tubes other than keeping vermin and debris out.? Haven’t seen them on other furnaces. Unit is a 2003 Amana.

Mesh is likely used to reduce NOX emissions. See related thread from 2008: https://www.nachi.org/forum/f20/mesh-wiring-furnace-27412/

Thanks Michael. Good info.