30 Questions
Which type of space need not be divided at a required vertical fire separation?
Concealed space
What is the maximum fire-resistance rating allowed for the construction between a horizontal service space and the space below, if the vertical fire separation does not require a fire-resistance rating more than 45 min?
30 min
Which of the following materials is NOT exempt from the flame-spread rating and smoke developed classification requirements for concealed spaces used as plenum within a floor or roof assembly?
Totally enclosed non-metallic raceways with an FT4 rating
What is the maximum flame-spread rating allowed for materials within a concealed space used as a plenum within a floor or roof assembly?
25
Which of the following is NOT a requirement for materials within a concealed space used as a plenum within a floor or roof assembly?
Tubing for pneumatic controls
Which material is NOT permitted for constructing ducts, duct connectors, associated fittings, and plenums in air duct systems?
Wood
What is the minimum size requirement for an access opening to a crawl space?
550 mm by 900 mm
In a building required to be of noncombustible construction, which of the following is NOT permitted for combustible ducts?
Ducts with an air temperature above 120°C
What is the maximum length permitted for duct connectors that contain combustible materials and are used between ducts and air outlet units?
4 m
What are the flame-spread rating and smoke developed classification requirements for duct sealants?
Flame-spread rating not more than 25 and smoke developed classification not more than 50
According to the National Building Code of Canada 2015, which of the following is true regarding coverings, linings, adhesives, and insulation for air duct systems?
They must be made of noncombustible material if exposed to heated air or radiation from heat sources with a surface temperature over 120°C.
According to the National Building Code of Canada 2015, what is the maximum flame-spread rating allowed for combustible coverings and linings in air duct systems?
25
According to the National Building Code of Canada 2015, under what conditions can foamed plastic insulation be used in an air duct system?
It can be installed in a ceiling space used as a return air plenum if protected from exposure to the plenum.
According to the National Building Code of Canada 2015, what is the maximum flame-spread rating allowed for insulation and coverings on piping located in rooms and spaces other than service spaces?
75
According to the National Building Code of Canada 2015, what is the maximum smoke developed classification allowed for combustible insulation and coverings used on piping in a building within the scope of Subsection 3.2.6?
100
What is the required clearance between a supply duct and combustible material if the plenum clearance is not more than 75 mm?
The required plenum clearance within a horizontal distance of 450 mm from the plenum
What is the required clearance between a supply duct and combustible material if the plenum clearance is more than 75 mm but not more than 150 mm?
The required plenum clearance within a horizontal distance of 1 800 mm from the plenum
What is the required clearance between a supply duct and combustible material if the plenum clearance is more than 150 mm?
The required plenum clearance within a horizontal distance of 1 000 mm from the plenum
What is the required clearance for a register installed in a floor directly over a pipeless furnace?
A double-walled register box with not less than 100 mm between walls
What is the maximum flame-spread rating allowed for combustible grilles, diffusers, and other devices for supply, return, and exhaust-air openings in rooms?
150
True or false: The clearance between a supply duct and combustible material is not less than the required plenum clearance within a horizontal distance of 450 mm from the plenum, and 12 mm at a horizontal distance of 450 mm or more from the plenum, if the plenum clearance required is not more than 75 mm.
True
True or false: The clearance between a supply duct and combustible material is not less than the required plenum clearance within a horizontal distance of 1 800 mm from the plenum, and 12 mm at a horizontal distance of 1 800 mm or more from the plenum, if the plenum clearance required is more than 75 mm but not more than 150 mm.
True
True or false: The clearance between a supply duct and combustible material is not less than the required plenum clearance within a horizontal distance of 1 000 mm from the plenum, 150 mm within a horizontal distance between 1 000 mm and 1 800 mm from the plenum, and 25 mm at a horizontal distance of 1 800 mm or more from the plenum, if the plenum clearance required is more than 150 mm.
True
True or false: A double-walled register box with not less than 100 mm between walls, or a register box with the warm-air passage completely surrounded by the cold-air passage, is permitted instead of the clearances listed in Sentences (2), (3) and (4) if a register is installed in a floor directly over a pipeless furnace.
True
True or false: Combustible grilles, diffusers, and other devices for supply, return, and exhaust-air openings in rooms must conform to the flame-spread rating and smoke developed classification requirements for the interior finish of the surface on which they are installed.
True
True or false: Return ducts must be constructed of material having a flame-spread rating not more than 150, except as required by other Sentences.
True
True or false: If any part of a return duct will be exposed to radiation from the furnace heat exchanger or other radiating part within the furnace, that part of a return duct directly above or within 600 mm of the outside furnace casing must be noncombustible.
True
True or false: Return ducts serving solid-fuel-burning furnaces must be constructed of noncombustible material.
True
True or false: Combustible return ducts must be lined with noncombustible material below floor registers, at the bottom of vertical ducts, and under furnaces having a bottom return.
True
True or false: Foamed plastic insulation can be used in an air duct system under certain conditions according to the National Building Code of Canada 2015.
True
Test your knowledge on coverings, linings, adhesives, and insulation for air ducts and other parts of air duct systems. This quiz covers the requirements for noncombustible materials when exposed to high temperatures. Brush up on the regulations outlined in the National Building Code of Canada 2015.
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