| 摘要 |
PROBLEM TO BE SOLVED: To improve a working efficiency and a sound absorption ability, by using a sound absorption board made of a porous concrete material in which a reinforcing material is embedded as a sound absorption plate which forms at least a bottom surface and an air flow passage of a ventilator in the vertical type ventilator in which the air flow passage is formed by the sound absorption plate. SOLUTION: A vertical type ventilator 1 installed on a roof 11 of a building is formed by a sound absorption plate 2 made of a porous concrete material in which a reinforcing material 3 is embedded and a sound absorption plate 2a for a bottom surface and a sound absorption plate 2b for an outer wall constitute a box-shaped body. Sound absorption plates 2c for an air flow passage are mounted in the inside of the ventilator 1 in an inclined manner. The sound absorption plates 2a, 2b are assembled into a sheet of sound absorption plate 2 using L-shaped steel members, 4 and the sound absorption plates 1c are mounted by a mounting steel members 5 such that two sound absorption plates 1c intersect each other thus forming an air flow passage 6. Between the sound absorption plates 2a, 2b, a gap is defined by a longitudinal member 7 so as to form an air inlet 8, a dome is mounted on a ceiling portion of the ventilator 1, and an air outlet is formed. |
