ch9 special ventilation operations Flashcards
where is staging in a high rise fire
two floors below the fire floor
freight elevators should only be used when?
authorized by the officer in charge of the fire floor
Those personnel assigned to blank should bring all elevators to the ground floor and lock them there
Lobby Control
the natural vertical movement of heat and smoke in tall structures \
stack effect
PPV blowers positioned at street level are effective up to about blank floors
22
somewhere near the vertical midpoint of a closed compartment, there is a point called the blank where the interior pressure is equal to the pressure outside the space
neutral pressure plane
the neutral pressure plane is usally between blank and blank percent of the building height
35-50
blank can raise or lower the neutral pressure plane within a building, which can have a major influence on high-rise ventilation
wind
ventilating above the fire floor will be most effective if the process is started at the blank of the building
top
the standard that provides guidelines for the design and installation of smoke and heat venting equipment
nfpa 204 guide for smoke and heat venting
blank are intended to limit the spread of fire within a building by releasing heat and smoke to the outside before the fire mushrooms throughout the building
automatic roof vents
these large, vertical openings lend themselves to the stack effect
atrium vents
blank are fire-resistive half walls that extend down from the underside of the roof
curtain boards aka draft curtains
curtain boards generally extend a distance equal to atleast blank percent of the vertical distance from the floor to the roof but not lower than 10 feet above the floor
20
the function of blank is to limit the horizontal spread of heat and smoke by confining it to a relatively small area directly over its source
curtain boards
