Review on Miady RV Furnace Vent Screen: Bug Cover for Camper Heater Exhaust Vents - 4.5x4.5 Stainless Steel Mesh Screens with Installation Tool Included by Timothy Barnes

The screen fits my 4x4 inch oven vent perfectly, but don't waste time installing it with the included springs. Good idea, but useless. I used some thin aluminum wires stretched under the sleeves of the vent, then passed through the screen and rolled up. I ordered this brand because the screen was listed with a finer mesh than others and it came with 2 springs. The springs were useless (for my application) and I believe the mesh is the same as other brands. No complaints. Worked fine in the end.