Apparatus, equipment and installations for heating, cooling, ventilating and air-conditioning, namely, electric radiant heaters, heating systems composed primarily of tubes, pipes and pre-assembled manifolds through which cold or low temperature water circulates, heat pumps, fan coils, evaporative air cooling units for domestic use, air conditioning apparatus, central air-conditioning installations, evaporators for air conditioners, ventilators for building and factory ventilation; fan-assist...