shown include an opposed blade damper set fully open.
When no damper
is required a reduction of both 2NR and 2Pa can be applied to the
noise and pressure figures stated.
projects it is a requirement for safety and insulation that the
exposed surfaces of the panel floor grilles are black nylon coated.
Other colours are available on request. Earthing terminals can also
be supplied as an option.
599 x 599 mm. size is the most common other sizes are available