IPC 2013 : E04D 13/152 : with ventilating means.

IPC2013 > E > E04 > E04D > E04D 13/00 > E04D 13/152[2] > with ventilating means.
Notes[t] E01 - E06: BUILDING
E SECTION E — FIXED CONSTRUCTIONS.
E04 BUILDING.
E04D ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS (coverings of outer walls by plaster or other porous material E04F 13/00).
E04D 13/00 Special arrangements or devices in connection with roof coverings; Roof drainage (ventilation tiles E04D 1/30; ventilation slabs E04D 3/40; internal channels E04F 17/00; roofing elements therefor, see the relevant groups).
E04D 13/152 · · with ventilating means.