3-3
3.3.2 Smoke
vent
(1) Use the smoke vent made of steel or any material having heat resistance equivalent to or
more than steel plate with 1.5 mm thickness.
(2) Install the smoke vent at such a place that exhausted smoke would not hinder evacuation or
firefighting activities, considering the location of the building (particularly conditions such as
wind direction, wind speed, and the conditions of buildings/roads surrounding it).
(3) Keep the smoke vent away from an air inlet of air conditioner or windows to prevent
exhausted smoke from re-entering the building.
(4) Install the smoke vent at such a place where spread of fire would be prevented, considering
the locations of adjoining buildings and facilities.
(5) When installing the smoke vent on an outer wall, be careful to prevent rain water from
entering it, and to not allow it to fall while exhausting smoke.
(6) Install the smoke vent in a way that the discharging speed (over an effective opening area)
would be 10 m/s or less as much as possible.
(7) If the smoke vent is shared for any other purpose, insert the partition plate into the chamber
and others. (As a general rule, the smoke vent should be used only for the purpose of
smoke ventilation.)
3.3.3 Others
(1) Secure spaces of approx. 600mm or more around the smoke ventilation fan.
(2) Install the fan in a way that it would resist an earthquake. The material and embedding
method of anchor bolts should meet the strength requirements that satisfy the standards in
“Guideline for seismic design and construction and installation” published by the Building
Center of Japan.
(3) Inspection ports should be provided on the inlet duct and the exhaust duct at the places
close to the exhaust fan.