Ventilation Flashcards
Stairshafts in high rise buildings constructed after ___ are required to employ a stairshaft ventilation system.
1974
Fan must provide not less than ____ while maintaining a positive pressure of not over ___ on interior doors
50 cubic feet per minute / 25 lbs
Pre-60 has _____ windows
openable
Post-60 has ___
tempered glass on at least two sides of the building
Post-60 Tempered glass location
at corners, and at 50 foot intervals or less
Post-74 has ____
tempered glass on four sides of the building
Post 74 Tempered glass location
at corners and at 50 foot intervals or less
Tempered glass windows are identified by ___
3 inch luminous or reflective decals in a lower corner which indicated for For FD use
Post 1996 “Uniform building code”
Requirement of smoke control systems in high rise buildings eliminated the requirement of installation of tempered glass
Prior to breaking windows….
radio notification shall be made indication the need and intention to break glass and the specific side of the building
Natural air flow within building stairshafts is virtually static in buildings up to ___
25 stories
Buildings over 25 stories will naturally flow
minimal amounts of air in an upward direction
Natural vertical air currents of ____, can be created by simply opening a door at the bottom and roof levels of a stair shaft
3 to 6 mph
High rise buildings constructed after ____ are required to employ an _____
1974 / emergency smoke control system
3 components of an emergency smoke control system
Pressurized stairshaft, mechanical smoke removal system, tempered glass or openable windows
Positive pressure ventilation using blowers should be placed
4 to 6 feet back from doorway and angled back at least 5 degrees
Placing fans in a ___ shape is more effective than placing them in series
V shape
Cross ventilation operations are effective up to
25 floors
Additionally the pressure generated by a fire (_____) will force smoke through these openings and may contaminate other floors or stairshafts within the building.
up to three times atmospheric pressure
Windows:
Post –1960 – Tempered glass on at least ____ of the building. (At corners, and at 50-foot intervals or less.)
two sides
Windows:
Post-1974 – Tempered glass on ____ of the building. (At corners, and at 50-foot intervals or less.)
four sides
Tempered glass windows are identified by ____ luminous or reflective decals in a lower corner which indicate they are “_____ .”
3-inch / For Fire Department Use
___ – Requirement of _____ (Uniform Building Code) in high rise buildings has eliminated the requirement of the installation of tempered glass.
Post 1996 / Smoke Control Systems
However, the natural air flow within building stairshafts is virtually static in buildings up to ____. Buildings over ____ will naturally flow minimal amounts of air in an upward direction.
25 stories
Therefore, when required, ventilation efforts directed at removing contaminants in these stairshafts must be augmented by ____ means other than utilizing natural air flow only.
mechanical
Natural vertical air currents of ___, that flow upward in stairshafts, can be created by simply opening a door at the bottom and roof levels of a stairshaft.
three to six mph
Water turbine blowers produce significantly less noise and will provide more than_____ that a like-sized gasoline powered blower. Water turbine blowers can be requested through MFC.
twice the cubic feet of air per minute
Portable blowers should be placed _____ from the doorway and angled back at least ___. This maximizes the flow through the fan shroud and air entrainment around the fan shroud as it reaches the door. Placing fans in a _____ than placing them is series.
4 feet to 6 feet back / 5 degrees / V-shape is more effective
The preceding cross ventilation operations are effective up to ___ in a high-rise building.
25 floors
If it is necessary to cross ventilate floors above the ___, it may be necessary to utilize an ____ in the pressurized stairshaft to supply additional pressurized air to the floor to be ventilated
25th floor / additional blower
