Service Rolls Flanders Service Rolls alr flatiron media are manufactured in selected widows, prepared in wolf fangs that make manageable rol sizes. In nest cases, a single cul across the roll will produce a ready-to-install filter pad. The following media are offered as service rolls: Spun Glass: (Models SCI) This is a rigid, nominal 8" thick: dry spun glass: ยง k typically used to make rigid pads foresightedness unit alr conditioners.