Broken storefront glass windows don’t just represent high repair expenses for your small business—they also send an unmistakably ugly message in the aftermath of a break-in. Glass storefronts require true security. You’ll enjoy that with the SAS, the solid side-folding security door model from Alumatec. You’ll also find the SAS and similar solid security doors behind storefront glass and in high-end retail to conceal store inventory. Any storefront or area that requires the highest level of security can benefit from solid side-folding security doors as well. For standalone storefront applications, Alumatec has designed our storefront mullion-mounted L-Bracket for ease of installation, boasting virtually no head-room requirement.