A heat accumulator block for regenerative heat exchangers has a heat exchanger of a plurality of heat exchanger plates arranged substantially parallel to one another for formation of flow channels. A dirt collector is arranged upstream of a side of the heat exchanger exposed to an inflowing cold medium....http://www.google.com/patents/US6145582?utm_source=gb-gplus-sharePatent US6145582 - Heat accumulator block for regenerated heat exchanger
