On Jan. 18, 2005 at 2039 hrs Engine Company 5 and Tanker 5 were alerted to Calvert Box 206, 40 Spring Hill CT, for a chimmney fire. Engine 5-2 and Tanker 5 responded with 8. Calvert Chief 2 had command and Asst. Chief 2 had interior. Chief 2 held Companies 2 and Engine Company 83 (Benedict); and placed all others in service. Tower 2 laddered the roof. Engine 2-1's crew chained the chimmney, dropped a few chimmney bombs, and checked for extention using a thermal imager. The crew from Eng. 5-2 went upstairs and checked the attic for extension with a thermal imager and found no extention. All units returned to service within 45 mins.