Commercial Steel Roll Up Door 3100 series is our certified wind load rated model that has been manufactured to withstand strong wind forces. Independent laboratory testing has verified that the Model 3100 steel roll-up door meets stringent building codes, while the included one-year warranty ensures its quality. Specific features and dimensions of the 3100 model are as follows: Multiple color options are available for greenhouses, retail applications, commercial and industrial properties, and warehouses. • Designed to meet stringent building codes in coastal regions • Utilizes a 12” drum wheel • The maximum opening size of 20’ wide x 14’ high (280 sq.ft.) • Push-up, hand chain, and electric operations • PSF Ratings: • +35 PSF and -41 PSF for opening widths through 12’ • +35 PSF and -38 PSF for opening widths over 12’ through 16’