coustic Catalogue Series SK Circular silencers Circular silencers KOOLAIR brand, model ASK-1 (without core) or ASK-2 (with core). The acoustic material comprises glass fibre density suitable for heat resistant and protected against erosion by perforated sheet galvanized plate. For the construction of the central core (ASK-2) are used the same materials. The maximum recommended temperature is 135° C. Acoustic external Louvre External acoustic louvre, Koolair brand, model 250-TAA (single thickness) and 250-TAAD (double thickness). Galvanized steel plate. Are used by introduction of fresh air or exhaust air discharge with attenuation of the initial noise level up to 20 dB (A) in the band of 250 Hz. The acoustic material is glass fibre heat-resistant and protected against erosion of the air by a perforated plate on the other side of the blades. The maximum recommended temperature is 135° C. Can incorporate bird-mesh (standard finish) or anti-insect mesh (on request). Rectangular silencers Rectangular acoustic silencers, Koolair brand, model PAK, PBK, PAKM and PBKM. Box of galvanized sheet steel. Designed to be installed in areas where the air distribution needs a low noise level, for the attenuation up to 50 dB (A) according to the selected model. The acoustic material is glass fibre heat-resistant and protected against erosion by the air layer of protection against fire: PAK. If in addition it incorporates perforated plate: PBK (suitable for high velocities). With further coating of a polyester film: PAKM and PBKM. The maximum recommended temperature is 135° C. Note: For more information refer to catalogue and/or Technical Department. Note: For more information refer to catalogue and/or Technical Department.

Dimension 0A Qmin (m3/h) Cl (m3/h) APmln (Pa) AP (Pa) max Selection table Attenuation. 600mm length Dimension B x H Q (m3/h) Vf (m/s) AP (Pa) LEGEND Qmin (m3/h): Air flow for a duct velocity of 4 m/s Qmax (m3/h): Air flow for a duct velocity of 12 m/s AP (Pa): Total pressure loss. Attenuation. 500mm length Attenuation. 1000mm length LEGEND Q (m3/h): Air flow. AP (Pa): Total pressure loss (L: 1000 mm). Vf (m/s): Air veloicty based on BxH section. Unit mm P: Airway in mm. fm (Hz): Octave band frequency. Note: The sound attenuation data provided corresponds to the use of 200 mm wide interior baffles....