I have an UFESA PF3500 air purifier for sale - €25. It is almost new, I only used it for one month. I am moving from Madrid to London and I can’t take it with me. It functions well - good for a bedroom or small room. I have the receipt (paid €59) and this will give you a one year warranty from the manufacturer. I also have the owners manual and original box. If you are interested, hopefully you can come by to pick it up. I live near Alto de Extremadura.