VENTILATION

Question 1

BACKDRAFT

Answer 1

-fire burning in closed compartment
-LIMITED amount of ventilation/ INSUFFICIENT OXYGEN
-ventilation opening introducing fresh air, gases mix and end up with TURBULENT EXPLOSION or deflagration

**backdraft occurs in CLOSE PROXIMITY TO MAIN BODY OF FIRE **

Question 2

SMOKE EXPLOSION

Answer 2

SUFFICIENT OXYGEN
REMOTE from main body of fire
NO VENTILATION REQUIRED

Question 3

FLASHOVER

Answer 3

in excess of 1100 degress F, reach auto ignition temp simultaneously

Question 4

FLOWPATH

Answer 4

HEAT AND SMOKE from HIGH PRESSURE (fire area ) TO LOW PRESSURE

Question 5

BI DIRECTIONAL

Answer 5

HOT GASES from FIRE AREA flowing toward ventilation point (window/door)
-hot gases smoke exhausting above neutral plane and fresh air coming in below neutral plane

Question 6

UNI DIRECTIONAL

Answer 6

ONE DIRECTION –
MULTI LEVEL COMPT. FIRE
UNIDIRECTIONAL HIGHER NEUTRAL PLANE , ONLY FRESH AIR PULLED IN AND HOT GASES EXHAUSTING ON FLOOR ABOVE .
**ONE DIRECTION ONLY **

Question 7

MODERN CONTENT FIRES

Answer 7

HIGH HEAT RELEASE RATE

Question 8

NEUTRAL PLANE

FULLY DEVELOPED–AT FLOOR

INCIPIENT –HIGH PLANE

Answer 8

Boundary layer
BELOW–AIR DRAWN IN WINDOW/DOOR
ABOVE–HOT GASES EXHAUSTED

**INDICATION OF STAGE OF FIRE AND DROPS DOWN TO FLOOR AS FIRE INTENSIFIES **

ROLLOVER - GROWTH STAGE…immediately cool with hoseline or exit fire area and control door

Question 9

EXCHANGE OF AIR BI DIRECTIONAL WHEN THERE IS A SINGLE VENT OPENING ON SAME LEVEL AS FIRE

Answer 9

BI DIRECTIONAL
SINGLE VENT OPENING
BI DIRECT- SINGLE

Question 10

UNIDIRECTIONAL

Answer 10

MULTIPLE VENT OPENINGS
AIR FLOWS IN INLET AND HEAT SMOKE AND FIRE EXHAUST OUTLET

UNI DIRECTIONAL- TWO VENT OPENINGS