Product DescriptionSalsbury 3600 Series 4B+ Horizontal Mailboxes - Front Loading - U.S.P.S. Access are ideal for apartments condominiums commercial buildings and residential developments. Manufactured by Salsbury Industries to USPS-STD-4B+ Specifications. 4B+ horizontal mailboxes are U.S.P.S. approved for replacement and/or retrofit installations. Feature a durable powder coated finish available in aluminum bronze gold and sandstone. Available in A size doors (6-1/2 W x 5-1/4 H) and larger B size doors (13 W x 5-1/4 H). Units with standard A size doors are available in 3 4 or 5 doors wide and 5 6 or 7 doors high. Units with larger B size doors are available in 2 doors wide and 5 6 or 7 doors high. Salsbury Industries is an ISO 9001: 2008 certified company and has excelled in the field of manufacturing since 1936.From the ManufacturerSalsbury 3600 Series 4B+ Horizontal Mailboxes - Front Loading - U.S.P.S. Access are ideal for apartments condominiums commercial buildings and residential developments. Manufactured by Salsbury Industries to USPS-STD-4B+ Specifications. 4B+ horizontal mailboxes are U.S.P.S. approved for replacement and/or retrofit installations. Feature a durable powder coated finish available in aluminum bronze gold and sandstone. Available in A size doors (6-1/2 W x 5-1/4 H) and larger B size doors (13 W x 5-1/4 H). Units with standard A size doors are available in 3 4 or 5 doors wide and 5 6 or 7 doors high. Units with larger B size doors are available in 2 doors wide and 5 6 or 7 doors high. Salsbury Industries is an ISO 9001: 2008 certified company and has excelled in the field of manufacturing since 1936.