Evaporative air coolers work by air being passed over a moist honeycomb material, the warm air from the room will evaporate the water on the honeycomb, this evaporation uses heat energy in the air - meaning the air coming out of the cooler will be colder
For parts like anchor rings and handles, we use the big high frequency welding machine to weld on the products instead of glue on by hand. The parts and the main body are fused together so the quality is very stable and will not peel off.