Galvanized units are made of corrosion resistant galvanized steel. Dimensions are the same as steel units. Aluminum provides all of the benefits of above steel units plus, the benefits of maintenance and corrosion free aluminum. Swing Out Utility Door Aluminum Model CM 222 CM222$190.00 View Installation Instructions CMI products toll free order and help line 1-800-335-1880. OHIO RESIDENTS will be charged Ohio Sales Tax unless we have a OHIO SALES TAX EXEMPTION FORM on file. The form is available at the link on the left side of this page.