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Product Description
TEN N scale winterization hatchs designed for Atlas GP7 / GP9 and F3, F7 and F9 locomotives with a 36" fan. Simply soak in Bestine, to clean off all waxy residue and use fine mesh to cover fan opening.
The best mesh material I've found is Lipton tea bags, durable nylon and paintable. Make sure to buy the pyramid type bags: https://www.amazon.com/Lipton-Black-Tea-Premium-Pyramid/dp/B00DG1GGXA