CPM 317 Table 1
As an example, room 419A would be level 4, primary room number 19, room number suffix A.
The first digit is used to identify floor levels above nine (e.g., 1025, 1130, etc.) and to identify lower levels (e.g., L1-00, L2-00, L3-00, etc.). Wing prefixes should only be used if there are too many rooms on a floor to allow rooms to be numbered without using a wing prefix. If used, the wing prefixes may be separated from the room number by a hyphen on the working drawings and on room number signs.
The second digit is used to identify floors between level 1 (ground level) and level 9 (e.g., 133, 722, etc.) and to identify levels below grade (e.g., L1-01, L2-35, etc.).
Below Grade Level Prefixes
In below grade level prefixes, the first digit (L) identifies that the level is below grade. The second digit (1, 2, 3, etc.) identifies the level, with 1 being the first below grade level.
Third and Fourth Digits
The third and fourth digits (01 through 99) are primary room numbers for rooms on the same level that are entered from a public circulation corridor. Mechanical rooms, janitorial areas, utility closets, and public restrooms are included in the room number sequence with a facility service space suffix.
Fifth and Sixth Digits
An alpha or numeric character is used to number rooms that are not entered from a public circulation corridor.
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