Smoke Outlets Flashcards
What are the 3 most common types of basement smoke outlet?
Smoke Outlets
- Pavement Lights
- Stallboard Lights
- Concrete (possibly with infill instead of glass lenses)
The total cross sectional area of smoke outlets should, at a minimum, be what percentage of the total floor area of the floor they ventilate?
Smoke outlets
2.5% of total floor area
Some outlets can be counterweighted, and operated from below. How can you identify where the mechanism is?
Smoke outlets
The glass block (lens) above will be coloured (Ruby glass)
What is the common practice for opening smoke oulets?
Smoke oulets
Crews use a sledgehammer to break. Start at the centre to cretae sufficient cracks then clear the rest of the went. Rebar may be bolt cropped or Recip’d
What SSOW need to implemented for crews detailed to open smoke vents?
Smoke outlets
- Under air
- Cordon on place
- Charged jet in place
- Safety officer
- Cognisent of the increased risk of falling into the basement as they open up
What must the IC ensure is donr regarding any crews committed to firefighting before opening smoke outlets?
Smoke outlets
Opening the smoke outlets will ventilate the floor connected, so any committed crews must be withdrawn from the floor affected.
How are smoke outlets identified?
Smoke outlets
Stallboard and pavement lights will be of concrete and glass block (lens) construction which is an indicator.
Additionally, smoke outlets should be marked with a sign.
How will a Basement / Sub Basement smoke outlet be identified?
Smoke outlets
Smoke outlets from a basement will have a metal plate 100mm x 75mm on the wasll adjacent or on the actual outlet.
How will a Basement / Sub Basement lobby smoke outlet be identified?
Smoke outlets
320cm2 sign on wall adjacent to outlet
Is there a minimum size or depth of basement that requires a smoke outlet or ventilation?
Smoke outlets
No. Building control recommends for each basement level regardless of size or depth.
If the level is >200M2 and >3M in depth, Ventilation is recommended
If a smoke outlet is infront of an entry/egress point, it will likely be reinforced concrete with a non slip surface. How can you identify it as a smoke outlet?
Smoke outlet
- 13mm wide metal strip of brass, bronze or stainless steel
OR - a 50mm wide beading of a distinctive colour (preferably red) and having the words “SMOKE OUTLET” inset in 150mm metal lettering into the surface
What areas within a basement may have seperate smoke outlets?
Smoke outlets
Boiler rooms, switch rooms, transformer chambers, sub stations.
How should smoke outlet shafts and bulkheads be constructed?
Smoke outlets
Imperforate walls, of the same fire resistance rating (or greater) as the floor over/above the floor/area where the shaft commen ces
