Ventilating installations and apparatus; installations and apparatus, all for air conditioning; humidifying and de-humidifying apparatus; filters being parts of or for use with the aforesaid air conditioning installations and apparatus; air heater apparatus; parts and fittings for all the aforesaid goods, ducting, air fans, fan diffuser apparatus and noise attenuation apparatus, all being parts and fittings for the aforesaid goods; all included in Class 11.;