The invention relates to a reciprocating slat conveyor multiple parallel slats that are slidable in the longitudinal direction, wherein the slats comprise subsequently alternating a first slat and a second slat, wherein the first slats comprise a horizontal upper wall section and an upright end wall section, and wherein the second slats comprise a horizontal upper wall section and a vertically upright wall section, wherein the upright wall section outwardly merges into an overhanging wall section that extends over the end wall section of the adjacent first slat, wherein the overhanging wall section merges into a vertically downwardly pending end wall section that extends aside the end wall section of the adjacent first slat, wherein a seal is present between the upright wall section and the end wall section of the second slat.