Blast Portable AC does NOT fulfil the advertised specifications. The bottom line, it does not cool a room in two hours, as specified; it would be better to describe it as an expensive "short-time" toy. We were NOT satisfied with the performance of any of the five units with their corresponding five filters. We decided to return them and requested a full refund. We received instructions from Blast on how and where to return the five units. We never heard back from this company and we DID NOT receive our refund. We have been unable to contact them again to resubmit our claim for the refund.