Specialty screen Stiff & ViPer Stiff Insect Screen Stiff & ViPer Stiff Insect Screen. Read full description > Contact Us Product Overview Stiff screen is fiberglass insect screen that provides durable and long-lasting protection against all types of insects, and excellent for use in retractable applications. Specifications Available widths Custom Available lengths Custom Certifications GREENGUARD [GOLD] Construction 18x16, 18x18 Yarn Diameter .011", .009" Color Charcoal Resources & Guides Brochures & Sell sheets (1) Siff & ViPER Sell Sheet PDF - 830.51 KB en Contact Us Product Overview Specifications Resources & Guides Download PrintShareFacebookLinkedIn