2.4         Door Number Assignment

Numbers are assigned to all doors to facilitate wayfinding and dispatching. As a number is assigned to a space, door(s) associated with that space are numbered at the same time. The door number is derived from the Unit Identifier of the space into which the door leads. In general, this is based on the space into which a door swings, however GETS staff can override this determination as needed. Spaces may have more than one door or different door configurations, and specific door numbering conventions and procedures are outlined below.

2.4.1            Door Numbering Coordination

The designers of Capital and Permitted projects shall contact GETS to request door number assignments during the design process, when one or more doors are to be installed, removed, or relocated as part of the project. Designers shall contact GETS at the following times depending on the project type:

A.      Capital Projects: Prior to each design submittal, beginning with the 30% design phase, and prior to any field changes or addenda

B.      Permitted Projects: As early as possible during design, prior to application for building permit

GETS will assign door numbers for a project based on the following conventions and procedures and will notify consultants via annotated PDF and/or text document of the newly assigned door numbers.

Designers are required to coordinate with GETS to adjust door number assignments as a project evolves, to accommodate expected design changes which may add, remove, or modify doors. Although such communication is mandated at each design phase, it is also encouraged in between design phases as well.

For Capital and Permitted projects, contractors are responsible for installing door number plates as defined in PEGS V2, Chapter 14.2 Interior Signage. Contractors are required to replace any door number plates damaged, lost, or removed during construction per these standards. During day-to-day maintenance outside of a construction project, the MDOT MAA Office of the Fire Marshall (OFM) is responsible for installing missing door number plates, and replacing incorrect or non-compliant door number plates, after coordination with GETS.

2.4.2            Spaces with Multiple Doors

If a space has multiple doors opening into it, the primary door will be assigned a number based on the space number and succeeding doors will be assigned the space number with an alphabetical suffix (e.g., primary door into space 100 would be door number 100 and additional doors into space 100 would be 100a, 100b, etc.). However, curbside entry vestibules in the BWI Marshall terminal each have multiple doors opening into them which are not assigned additional identifiers;

all doors associated with a curbside entry vestibule are considered a single entity, and assigned the same door number, consistent with the Unit Identifier of the vestibule.

2.4.3            Door Numbers for Space Subdivisions

As above, door numbers are assigned based on the Unit Identifier of the space the door leads into, including if the space is a subdivision of a larger space. If a subdivided space has multiple doors opening into it, the primary door will be assigned the space number including its alphabetical suffix and succeeding doors will be numbered with the space number and its alphabetical suffix, plus an additional numerical suffix.

2.4.4            Numbering Roll-up Doors

As with other doors, roll-up or overhead doors are assigned the space identifier of the room they are associated with along with suffix of “R” plus an increasing letter character, e.g., RA, RB, RC, etc. For example, for space CT100, there may be a standard door, CT100A, and two roll-up doors, CT100RA and CT100RB. For spaces with only one roll-up door, the suffix “RA” is used. Numeric suffixes may be used along with alphabetical suffixes at the discretion of GETS. For example, cargo buildings with multiple roll-up doors on both sides may use numeric on one side, and alphabetical on the other, such as C100R01 thru C100R12, and C100RA thru C100RL. Security grates at concession entrances are considered roll-ups for numbering purposes.

2.4.5            Doors at BWI Marshall Passenger Terminal Aircraft Boarding Gates

Doors at aircraft boarding gates are numbered corresponding with their Gate number, e.g., “Gate D4”.

2.4.6            Martin State Door Numbering

Doors are not numbered at Martin State Airport and instead only space numbers are assigned. Any signage for spaces may be on or adjacent to door portals at the discretion of the Martin State Airport management.