Vertical ducts; Channels, e.g. for drainage (pipes in general F16L; pipe-line systems F17D )

Child Classifications

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• E04F 17/005
• E04F 17/02 for carrying away waste gases, e.g. flue gases (free-standing chimneys E04H12/28; connections between fireplace and chimney, chimney fittings, covers for cleaning holes of chimneys F23J; chimney tops F23L); Building elements specially designed therefor, e.g. shaped bricks or sets thereof
• E04F 17/04 Air-ducts or air channels
• E04F 17/06 Light shafts, e.g. for cellars
• E04F 17/08 for receiving utility lines, e.g. cables, pipes (covers giving access to the ducts or channels, covers of inspection holes E04F19/08)
• E04F 17/10 Arrangements in buildings for the disposal of refuse (refuse bins, gathering or removal of refuse B65F)