Square diffuser model 52-FR-4 Stamp, KOOLAIR, air discharge in four directions. The free opening must be 150 mm more than the nominal dimension, except for the diffuser with a nominal dimension of 500 which must have a free opening of 130 mm. In addition, a diffuser with a nominal dimension of 300 will require an opening in the drop ceiling of 450
x 450 mm.
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