Light, Ventilation & Heating: IRC R303

Question 1

Habitable rooms shall have an aggregate glazing area of not less than _____of the floor area of such rooms. Natural ventilation shall be through windows, skylights, doors, louvers or other approved openings to the outdoor air. Such openings shall be provided with ready access or shall otherwise be readily controllable by the building occupants. The openable area to the outdoors shall be not less than _____ of the floor area being ventilated.

a. 10%, 5%
b. 9%, 6%
c. 8%, 4%
d. 7%, 3%

Answer 1

c. 8%, 4%

[IRC R303.1]

Question 2

For the purpose of determining light and ventilation requirements, any room shall be considered to be a portion of an adjoining room where not less than ____ of the area of the common wall is open and unobstructed and provides an opening of not less than _____ of the floor area of the interior room and not less than _____.

a. 1/4, 1/2, 25 sq ft
b. 1/2, 2/3, 30 sq ft
c. 3/4, 1/2, 20 sq ft
d. 1/2, 1/10, 25 sq ft

Answer 2

d. 1/2, 1/10, 25 sq ft

[IRC R303.2]

Question 3

Openings required for light or ventilation shall be permitted to open into a sunroom with thermal isolation or a patio cover, provided that there is an openable area between the adjoining room and the sunroom or patio cover of not less than one-tenth of the floor area of the interior room and not less than 20 square feet. (TRUE/FALSE)

Answer 3

TRUE

[IRC R303.2 (Exception)]

Question 4

Bathrooms, water closet compartments and other similar rooms shall be provided with aggregate glazing area in windows of not less than _____, 1/2 of which must be openable.

a. 3 sq ft
b. 3.5 sq ft
c. 4 sq ft
d. 4.5 sq ft

Answer 4

a. 3 sq ft

[IRC R303.3]

Question 5

Bathroom vent systems shall be designed to have the capacity to exhaust the minimum air flow rate of mechanical exhaust capacity of ___ cfm intermittent or ___ cfm continuous.

a. 50, 20
b. 40, 30
c. 20, 50
d. 30. 40

Answer 5

a. 50, 20
[IRC R303.3]
[IRC TABLE M1507.4]

Question 6

Mechanical and gravity outdoor air intake openings shall be located not less than 10’ from any hazardous or noxious contaminant, such as vents, chimneys, plumbing vents, streets, alleys, parking lots and loading docks. The 10’ separation is not required where the intake opening is located 3’ or greater below the contaminant source. (TRUE/FALSE)

Answer 6

TRUE

[IRC R303.5.1]