A closed biofilter in tier construction comprises filter baskets (1, 2, 3, 4) in the form of filter inserts in a frame (6). An odor and flow-tight covering forms an air distribution space (7) below each filter basket (1, 2, 3, 4) and an air collection space (8) above the surface of the filter basket (1, 2, 3, 4). All air distribution spaces (7) are directly connected to a common distribution shaft (9) and all air collection spaces (8) are connected to a collection shaft (11). The individual levels or their filter baskets (1, 2, 3, 4) are thus connected in parallel. The construction provides for the distribution shaft (9) and the collecting shaft (11) to the left and right of the frame (6) supporting the filter baskets, the front of which is formed by a door (13).
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