Window Head Height Overrides¶

Use Window Head Height Overrides when one or more windows need a head height that differs from the normal project standard.

Flow manages these exceptions using dedicated Global Parameter associations rather than disconnecting the window from the project control system.

Standard Head Height Associations¶

The normal Window head-height Global Parameters are:

Window Standard Global Parameter

New Window Head Height Existing X-Window Head Height

Overrides allow selected windows to use a separate controlled value while the remaining windows continue to follow the standard project parameter.

Individual Override¶

Use an individual override when a single window needs its own head-height control.

Flow:

checks the Window's current standard association
repairs the standard association first if it is missing
creates or finds the required override Global Parameter
copies the current standard value into the override
associates the selected Window with the override

Because the current standard value is copied into the new override, creating the override does not by itself change the Window's head height.

You can then adjust the override value independently.

Create the override before changing the value

The override begins with the current standard head-height value.

This separates the Window from the standard control without immediately moving the opening.

Shared Override¶

Use a shared override when several windows need to use the same alternative head height.

The shared override workflow allows you to provide an override suffix.

Flow uses that suffix to create a shared Global Parameter name in the form:

X-Window Head Height_<suffix>

The selected windows can then be associated with the same override parameter.

The initial override value is copied from the source standard Global Parameter.

Shared overrides

The current shared-override workflow is based on the Existing Window head-height standard.

It provides a controlled way for multiple Existing windows to share one alternative head-height value.

Assign an Existing Head Height Global Parameter¶

You can also assign selected windows to an existing head-height Global Parameter.

Flow provides the available recognised head-height parameters, including the standard parameter and compatible override parameters.

If a Window already uses the selected Global Parameter, Flow leaves that association in place.

If it uses another Global Parameter, Flow can replace that association with the selected head-height parameter.

Remove an Individual Override¶

Use Remove Override when a Window should return to the standard head-height control.

Flow restores the Window to:

Window Head Height

If the standard Global Parameter is missing, Flow can create it.

If the Window has no current Global Parameter association, the operation can repair the missing standard association.

Recognised Overrides¶

Flow only removes an association as an individual Flow head-height override when it follows the recognised override naming pattern:

Window Head Height_...

An arbitrary Global Parameter is not treated as a Flow override.

This protects unrelated project Global Parameter associations from being removed accidentally.

When to Use an Override¶

Use a head-height override when:

one Window needs a different head height from the project standard
a controlled group of Existing windows needs to share an alternative head height
an existing recognised head-height Global Parameter should be assigned to selected windows

Do not use an override where the project-wide standard itself should change.

In that case, update the appropriate standard Global Parameter instead.

Standard vs Override¶

A typical setup might be:

Window Head Height
    ├── W01
    ├── W02
    └── W04

Window Head Height_W03
    └── W03

The standard parameter continues to control the normal windows while W03 has its own controlled exception.

For a shared Existing-window exception:

X-Window Head Height
    ├── Wx01
    └── Wx02

X-Window Head Height_Lower
    ├── Wx03
    └── Wx04

After Changing Overrides¶

After creating, assigning or removing a head-height override:

review the affected Window in Revit
confirm that the required Global Parameter association is in place
adjust the override value if required
refresh Openings Manager
review the updated Global Parameter status

If an Override Cannot Be Removed¶

Check that the Window is actually associated with a recognised Flow override.

The individual override removal workflow expects the current Global Parameter to follow:

Window Head Height_...

If the Window uses an unrelated Global Parameter, Flow does not treat that association as a removable Flow override.

For further checks:

➡️ Openings Manager Troubleshooting