Description 36" x 48" Weather-Resistant Stainless Steel Access Panel XPS - Weather Resistant Flush Access Panel A Weather-Resistant, Insulated Stainless Steel Access Panel for Exterior Applications Product Spec Sheet: Door size: 16 Gauge Stainless Steel Frame with 1" Flange. Door: #304 Stainless – #4 Finish. See XPS-36-48 in action on YouTube!