The blowers that were installed on the chassis when the standby MM was once primary. The time of the last update can be obtained by querying rbistUpdateTimePrimary object. The blowers are listed as a bitmap. The bitmap is a string containing a list of 1's and 0's that is as long as the number of blowers supported. If a blower is installed in a bay, a 1 is present in the string in the position representing the bay ID as read from left to right. For example, if a blower is installed in bay 1, and 2 blowers are supported, the string would look like '10'. NOTE: Blowers are also referred to as Chassis Cooling Devices.