pipe chase= piping for hot and cold water, spinkler etc.
In general a fire or smoke damper may be required whenevr a duct penetrates a fire rated assembly
NFPA 90 requires that the HVAC enclosure be a ___hr FRR for buildings less than 4 stories and ___ FRR for buildings greater than 4 stories
1hr less than four stories
2hr greater than 4 stories
Smoke control systems are a means to control smoke thru use of mechanical fans to produce pressure differences across smoke barriers to inhibit smoke movement
2 types: automatic and manual; describe
automatic- accomplished by smoke detectors
manual- transfer valve to fire mode; adv eliminating system disruption due to false alarms; disadv slower response
There are 2 methods that can be used to protect an enclosed stairway
1. smokeproof tower; describe
2. Pressurized stairwell; describe
smokeproof stairwell- makes use of a vestibule between corridor and the stairwell that is open to the atmosphere where smoke is exhausted
pressurized- uses a blowe or fan to provide a slightly greater pressure in the stairwell than the corridor to prvent infiltration of smoke.
2 types single injection and multiple injection
What are curtain boards?
Used in conjunction with smoke vents to increase effectiveness. Hung from ceiling. These reduce the dissipation of the heated air currents froma fire and increase speed of operation of vents
*should not be placed further than 8x the ceiling height
High voltage is defined as? Low voltage?
What is the FRR if a transformer room is inside the building, with autosprinklers? and without auto sprinklers?
High voltage is greater than 600 volts; low is less than 600 volts
FRR of transformer room without autosprinkler 3hr
if it has automatic sprinkler 1HR FRR
Generators are limited to how gallons of diesel?
What are things classified as interior finishes?
Exposed interior surfaces of buildings including fixed or movable walls, partitions, columns and ceilings
* bulding codes exclude surface treatments no greater than 1/28"
What are the class ratings of interior finishes?
Class A 0-25= materials with this rating are required in the vertical exits of most occupancies
Class B 26-75 Are required in corridors that provide exit access
Class C 76-200
Common fire retardent coatings (4)
Intumescent paints- expand when exposed to heat to thick puffy coating
mastics-similar to intumescent but organic materials used
gas forming agents
cementious and mineral fiber coatings
Firewalls must extend beyond walls and roofs to revent padiant heat of flames. Parapet wall height must be _____
Interior walls used to subdivide a floor or area
partitions in exit corridor may require 1HR FRR
also 1HR FRR if separating apartment units, commonly done by use of gypsum board or each side of steel studs
Enclosure and Shaft walls FRR?
Stairwells in buildings 3 stories or less require 1 HR FRR
stairwells taller than 3 stories or more require 2HR FRR
What are curtain walls?
serve to enclose a building when it provides no structural support. Designed to separate interior from wind, rain, and snow and rain
Also to control heat loss, noise transmission, and solar radiation
Fire Doors FRR? (7)
Fire door ratings are 4HR, 3HR, 1 1/2HR, 1HR, 3/4 HR, 1/2 HR, and 20 mins
What are the classes of fire doors under the old system?(A-E)
Class A openings in firewalls
Class B openings in vertical shafts and openings in 2HR rated partitions
Class C openings in between rooms and corridors FRR 1 HR or less
Class D openings in exterior walls subject to severe fire exposure from the outside
Class E openings in exterior walls subject to moderate fire exposure from the outiside
Glazing and Fire Doors
Doors with up to ___HR FRR can have glass panels
Fire doors with 1, 1 1/2, and 3HR ratings ccan have glass panels up to ___
Fire doors rated at 3/4 can have a total glass area consistent with their listing but individual pieces cannot exceed _____
2. 100 sq inches
3. 1296 sq inches
Types of Fire doors describe
Rolling steel fire doors
Horizontal sliding doors
Swinging fire doors
Special fire doors
Rolling steel fire doors- on overhead rolling door ordinarily closes under the force of gravity when a fusible link melts but moror driven also available
Horizontal Sliding doors- These doors are usually held open by a fusible link and SLIDE into position along a track either by gravity or by counterweight
Swinging fire doors- very common for stairwell enclosures and corridors; avail in ratings of 3HR to 20 mins
Special- horizontal has been developed with motor
Builder's hardware and fire door hardware difference?