The
Novas fully concealed transom closers are
designed to provide positive centring and
door control on manually operated single
or double action internal and external Aluminium
doors.
The most important factors to be considered
when selecting manually operated transom
closer spring strength are the door size,
the environment in which the door will operate
and people using the door.
Selection of Spring Strength
For external doors, the size
of the door and effect of wind upon its
surface area must be considered in relation
to the spring strength required to hold
the door closed against wind pressure, and
then this must be balanced by the ability
of the users to exert sufficient pressure
on the door to push it or pull it open.
The push plate/pull handle must also be
considered, as this may drastically diminish
the available leverage.
The following chart is provided as a guide
to choosing the best spring strength for
your requirements. |
