You can access space properties in various ways. After accessing the space properties, you can define them on the Properties palette. The following table lists space properties:

Parameter	Description
Constraints
Level	The base level on which the space resides. This is a read-only value.
Upper Limit	The level from which to measure the upper boundary of the space.
Limit Offset	The distance at which the upper boundary of the space occurs, measuring from the Upper Limit level. Enter a positive number to go above the Upper Limit level, or enter a negative number to go below it. Enter 0 (zero) to use the level specified for the Upper Limit. The default is 10’ (4000 mm).
Base Offset	The distance at which the lower boundary of the space occurs, measuring from the base level (defined by the Level parameter). Enter a positive number to go above the base level, or enter a negative number to go below it. Enter 0 (zero) to use the base level. The default is 0.
Electrical Lighting
Average Estimated Illumination	Illumination for the space.
Room Cavity Ratio	This parameter is automatically calculated based on room dimensions to determine illumination calculations. See Lighting Calcuations
Lighting Calculation Workplane	The level used as the base for calculating Illumination.
Ceiling Reflectance	The reflective property based on color and surface of the ceiling.
Wall Reflectance	The reflective property based on color and surface of the walls.
Floor Reflectance	The reflective property based on color and surface of the floor.
Electrical Loads
Design HVAC Load per area	Total HVAC load for the space. This value can be specified, calculated by the heating and cooling loads analysis tool, or read from a gbXML file.
Actual HVAC Load	Total heating load for the space calculated by the integrated heating and cooling loads analysis tool.
Design Other Load per area	Total Other load for the space. This value can be specified, calculated by the heating and cooling loads analysis tool, or read from a gbXML file.
Actual Other Load	Total Other load for the space calculated by the integrated heating and cooling loads analysis tool.
Mechanical - Airflow
Specified Supply Airflow	Supply airflow introduced in the space. This value can be specified, calculated by the integrated heating and cooling loads analysis tool, or read from a gbXML file.
Calculated Supply Airflow	Total airflow required to head and cool the space. This value can be calculated by the integrated heating and cooling loads analysis tool or read from a gbXML file.
Actual Supply Airflow	Total supply airflow in the space. This value is the sum of the airflow for all supply air terminals in the space.
Return Airflow	Determines how the return airflow is calculated for the space. You can select one of the following values: Specified: Activates the Specified Return Airflow parameter to specify the return airflow. Specified Supply Airflow: Return airflow matches the value for this parameter. Calculated Supply Airflow: Return airflow matches the value for this parameter. Actual Supply Airflow: Return airflow matches the value for this parameter.
Specified Return Airflow	Total return airflow removed for the space. You can specify this value only if Specified is selected for the Return Airflow parameter. If not, this parameter is unavailable and the value is determined by the value selected for Return Airflow (see above).
Actual Return Airflow	Total return airflow in the space. This value is the sum of the airflow for all return air terminals in the space.
Specified Exhaust Airflow	Total exhaust airflow for the space. You specify this value.
Actual Exhaust Airflow	Total exhaust airflow for the space. This value is the sum of the airflow for all the exhaust air terminals in the space.
Dimensions
Area	The net area computed from the room-bounding elements. A read-only value.
Perimeter	The perimeter of the room. This is a read-only value.
Unbounded Height	The largest potential height of the room, based on the room height parameters: Level, Upper Limit, Limit Offset, and Base Offset. This is a read-only value. (The room’s actual height may be changed by room-bounding elements, such as intervening floors and roofs.
Volume	The volume of the room when volume computation is enabled. This is a read-only value.
Identity Data
Number	An assigned space number. This value must be unique for each space in a project. Revit MEP warns you if the number is already used but allows you to continue using it.
Name	The space name, such as Restroom or Kitchen.
Room Number	An assigned room number. This value must be unique for each room in a project. Revit MEP warns you if the number is already used but allows you to continue using it.
Room Name	The room name, such as Conference Room or Kitchen.
Comments	User-specified information about the space.
Occupant	Name of the person, group, or organization that will use the space.
Phasing
Phase	The project phase to which the space belongs. A read-only value based on view properties.
Energy Analysis
Occupiable	Indicates if the space is occupiable or not. If checked, the space is defined as occupied. Clear the check box for shafts, chases, restrooms, and other spaces that typically would be defined as unoccupied. This parameter is used during loads analysis.
Plenum	Indicates if the space is a plenum space. If checked, the space is defined as a plenum. This parameter is used during loads analysis.
Zone	The name of the zone assigned to the space.
Condition Type	Determines how heating and cooling loads are calculated. When set to Unconditioned, no loads are be calculated. When set to Heated, only heating loads are calculated; when set to Cooled, only cooling loads are calculated. All other settings contribute to the loads calculation. You can select one of the following types: Heated Cooled Heated and cooled Unconditioned Vented Naturally vented only The value for this parameter is exported as the conditionType attribute. NoteConditioned and Unconditioned spaces must not be mixed within a particular zone. See Handling Unconditioned Spaces.
Space Type	You can select the type of space from the Space Type Settings dialog. You can also modify parameter settings for the selected space type. The value for this parameter is exported as the spaceType attribute.
Construction Type	Specifies the type of construction (Roofs, Walls, Floors, etc.) for the space. You can open the Building Construction Dialog to select a Construction Type or define custom constructions for the space.
People	Opens the People Loads dialog where you specify how people loads are calculated for the space.
Electrical Loads	Opens the Electrical Loads dialog where you specify how electrical loads are calculated for the space.
Calculated Heating Load	Total heating load for the space. This value can be calculated by the integrated heating and cooling loads analysis tool or read from a gbXML file. “Not Computed” displays prior to the project receiving loads analysis results.
Design Heating Load	Total heating load for the space. This value can be specified, calculated by the integrated heating and cooling loads analysis tool, or read from a gbXML file.
Calculated Cooling Load	Total cooling load for the space. This value can be calculated by the integrated heating and cooling loads analysis tool or read from a gbXML file. “Not Computed” displays prior to the project receiving loads analysis results.
Design Cooling Load	Total cooling load for the space. This value can be specified, calculated by the integrated heating and cooling loads analysis tool, or read from a gbXML file.

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