Ventilation Chapter 14 Flashcards
Why is ppv more popular?
Effectiveness and firefighter safety
Compared with negative pressure ventilation, ppv is approx ____ as effective at removing contaminates?
Twice
Which is more effective, series or parallel ppv?
Series
Of two blowers of unequal size are used in series, place _____ one about ___ft back from entrance?
Larger one
2 ft
What does smell of exhaust indicate?
Exhaust hole is not large enough.
Removing screens will improve ventilation on windows by ?
50%
Ppv is ineffective in winds about ?
25 mph
In multiple story start?
Lowest level
Ppv is ineffective for distances over ____ft?
1,000ft
Drafts in ioen stair cases from exterior to roof can have up to?
3-6mph
Cross ventilation are ineffective at ?
25 floors
How much co will ppv fan introduce into structure?
130-220ppm
Key to ppv in ballon frame?
Opening exhaust first as not to spread fire
Open windows on the ____ side first?
Leeward
4 basic types of openings used for ventilation?
Natural openings
Natural construction openings
Heat openings
Direction openings.
Hear openings are considered _____ ventilation
Offensive
Direction are ____ ventilation
Defensive
Too priority in any ventilation?
Improving interior environment.
Small opening to see wether smoke or fire are below you?
Kerf cut
Small triangular hole?
Plug
Junction of a roof and a wall by roofing materials
Cricket
Rotating ventilators are ___ more effective than if it was taken off?
30%
4 major types of exterior styles that use panelized roofs are?
Exterior pilaster
Frame stucco and masonry
Concrete tilt up
Banked elevators may safely be used if they terminate at least ___?
5 floors below fire floor
