Smoke Removal Flashcards
What will ventilation in timely fashion result in?
Assist search rescue and extinguishment overhaul ops and other suppression ops
Reduce or eliminate product of combustion
Reduce interior temperature within a structure
Improve visibility
Increase safety
What factors are dependent for satisfactory natural ventilation?
Proximity of ventilation opening to contaminants
Ability for contaminants to travel unobstructed
Number and size of ventilation opening
Direction of wind
Humidity
Temperature differential between interior and exterior of building
What methods are used by blowers for ventilation?
Positive and negative
What are disadvantages of negative pressure ?
Personnel must be exposed to position blowers
Contaminants go thru the blower additional cleanup and maintenance
Blowers placed in doors or hallways can block entry or exit to building
To be effectively positioned blowers suspended in doorways or window must utilize straps ladders and other accessories
Interior blowers not as efficient removing contaminants form top of room because the path of least resistance
What is positive pressure ventilation?
Setting up blower outside forcing fresh clean pressurized air into building and using small opening like window as exhaust
What are advantages of positive pressure ventilation?
Personnel are not exposed to hazardous contaminants
Contaminants are not drawn thru blowers
Doorways hallways and windows do not need to be blocked
Reduce noise level
Not dependent on additional equipment
Removing contaminants top bottom and corners
2 times more effective at removing contaminants than negative pressure
What’s the appropriate positioning of blowers at entrance ?
Blowers must be positioned so cone of air issued from blower will completely cover the entrance
Air flow between openings must be___?
Controlled to achieve maximum ventilation
Positive pressure ventilation is most efficient when exhaust opening is between _____ and. ______ the size of entrance opening
3/4 and 1 3/4
What’s the exhaust opening variance dependent of ?
The CFM rating of blower
What’s key way to know hat exhaust is not big enough with gasoline powered blower?
Exhaust odor from blower
What weather condition may cause adverse effect on blowers?
Wind dependent on direction and velocity
Positive pressure has been proven effective against winds of up to____?
25mph
Small blowers need to be moved _____ from entrance while LARGER blowers can be moved____ from entrance opening?
Back
Closer
Multiple blowers in series can
Frantically increase CFM
Blowers parallel can
Provide proper coverage of entrance opening
How do you place blowers in series?
Blower A 2 feet from entrance blower b enough distance to cover entrance opening with pressurized air
How much more efficient can running blowers in series be?
10%
If unequal CFM are utilized how should they be placed ?
Blower A larger blower 2 feet from entrance and blower B smaller blower in back to cover entrance with pressurized air
When can smaller blower be placed in front big blower?
If area entrance opening is limited to 3-4ft (raised porch)
How to run blowers parallel?
Dependent on size of opening for large openings
How top position blower in area without exhaust opening ?
Blower A can be located outside of building and blower B in the bottom portion will provide pressure within area to be ventilated forcing them out upper portion of entrance opening
True or false During positive pressure operations it is ok to open up the structure ?
False
How much more efficient is a window opening without window ?
By at least 50%
Opposing blowers can be utilized to remove contaminants with equal and unequal blowers?
True or False
True
In hallways and apartment
When large ventilators removes sky lights or ventilation openings negatively effect ppv what should you do ?
Use them as vertical exhaust and close windows and doors below the
Various large doors can be controlled by
Closing the door a bit and reducing the size of opening
How do you ventilate buildings with multiple floors?
Start floor with most heat and smoke then systematically floor by floor
Will water power blowers prod e more CFM than gas power blowers?
Yes
When should water power blowers be considered?
Metro rail tunnels High rise Large underground parking Rest homes Hospitals
Are water power blowers intrinsically safe?
Yes
What are carbon monoxide ranges of a fire ?
500ppm -1200 ppm
