Thermafiber Spiral Anchors are designed for easy attachment of the Thermafiber FireSpan mullion covers to the FireSpan spandrel insulation panel. Spiral Anchors are also a versatile component that can be used to mechanically fasten insulation to insulation in other applications. Spiral Anchors can be used in conjunction with the Thermafiber Impasse Insulation Hanger System for quick and easy installation.