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ICC RF RESIDENTIAL FIRE SPRINKLER
INSPECTOR/PLANS EXAMINER —
PRACTICE QUESTIONS WITH VERIFIED
ANSWERS & COMPLETE RATIONALES
**1. What is the primary reference standard for residential fire
sprinkler systems in one- and two-family dwellings?**
A. NFPA 13
B. NFPA 13D
C. NFPA 13R
D. NFPA 25
**Correct answer:** B
**Rationale:** NFPA 13D, *Standard for the Installation of
Sprinkler Systems in One- and Two-Family Dwellings and
Manufactured Homes*, is the primary standard governing
residential fire sprinkler systems for these occupancies . The
IRC Section P2904 is an alternative equivalent standard .
--
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**2. The K-factor of a sprinkler is a measure of which
characteristic?**
A. The temperature rating of the sprinkler
B. The flow coefficient of the sprinkler
C. The pressure rating of the sprinkler
D. The distance from the ceiling to the deflector
**Correct answer:** B
**Rationale:** The K-factor measures the sprinkler head's
discharge capacity, used in the formula Q = K × √P, where Q is
flow and P is pressure .
--
**3. During a plan review, you notice the designer did not
include a fire department connection (FDC). For a single-family
home, is this acceptable?**
A. No, an FDC is always required
B. Yes, an FDC is only required for commercial properties
C. Yes, an FDC is not required for NFPA 13D systems
D. No, the FDC is required for all new construction
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**Correct answer:** C
**Rationale:** NFPA 13D does not require a Fire Department
Connection (FDC) for residential systems, as they are typically
designed for occupant life safety during egress .
--
**4. What is the maximum area of coverage for a single
residential sprinkler under IRC Section P2904.2.4.1?**
A. 100 square feet
B. 200 square feet
C. 300 square feet
D. 400 square feet
**Correct answer:** D
**Rationale:** Under IRC P2904.2.4.1, the area of coverage of
a single sprinkler shall not exceed 400 square feet (37 m²),
based on the sprinkler listing and manufacturer's installation
instructions .
--
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**5. A pendent sprinkler is located within how many feet of the
center of a ceiling fan before it is considered obstructed?**
A. 1 foot
B. 2 feet
C. 3 feet
D. 5 feet
**Correct answer:** C
**Rationale:** Under IRC P2904.2.4.2.1, pendent sprinklers
within 3 feet (915 mm) of the center of a ceiling fan, surface-
mounted ceiling luminaire, or similar object shall be considered
to be obstructed, and additional sprinklers shall be installed .
--
**6. A sidewall sprinkler is located within how many feet of the
center of a ceiling fan before it is considered obstructed?**
A. 1 foot
B. 2 feet
C. 3 feet
D. 5 feet
ICC RF RESIDENTIAL FIRE SPRINKLER
INSPECTOR/PLANS EXAMINER —
PRACTICE QUESTIONS WITH VERIFIED
ANSWERS & COMPLETE RATIONALES
**1. What is the primary reference standard for residential fire
sprinkler systems in one- and two-family dwellings?**
A. NFPA 13
B. NFPA 13D
C. NFPA 13R
D. NFPA 25
**Correct answer:** B
**Rationale:** NFPA 13D, *Standard for the Installation of
Sprinkler Systems in One- and Two-Family Dwellings and
Manufactured Homes*, is the primary standard governing
residential fire sprinkler systems for these occupancies . The
IRC Section P2904 is an alternative equivalent standard .
--
,2 | Page
**2. The K-factor of a sprinkler is a measure of which
characteristic?**
A. The temperature rating of the sprinkler
B. The flow coefficient of the sprinkler
C. The pressure rating of the sprinkler
D. The distance from the ceiling to the deflector
**Correct answer:** B
**Rationale:** The K-factor measures the sprinkler head's
discharge capacity, used in the formula Q = K × √P, where Q is
flow and P is pressure .
--
**3. During a plan review, you notice the designer did not
include a fire department connection (FDC). For a single-family
home, is this acceptable?**
A. No, an FDC is always required
B. Yes, an FDC is only required for commercial properties
C. Yes, an FDC is not required for NFPA 13D systems
D. No, the FDC is required for all new construction
,3 | Page
**Correct answer:** C
**Rationale:** NFPA 13D does not require a Fire Department
Connection (FDC) for residential systems, as they are typically
designed for occupant life safety during egress .
--
**4. What is the maximum area of coverage for a single
residential sprinkler under IRC Section P2904.2.4.1?**
A. 100 square feet
B. 200 square feet
C. 300 square feet
D. 400 square feet
**Correct answer:** D
**Rationale:** Under IRC P2904.2.4.1, the area of coverage of
a single sprinkler shall not exceed 400 square feet (37 m²),
based on the sprinkler listing and manufacturer's installation
instructions .
--
, 4 | Page
**5. A pendent sprinkler is located within how many feet of the
center of a ceiling fan before it is considered obstructed?**
A. 1 foot
B. 2 feet
C. 3 feet
D. 5 feet
**Correct answer:** C
**Rationale:** Under IRC P2904.2.4.2.1, pendent sprinklers
within 3 feet (915 mm) of the center of a ceiling fan, surface-
mounted ceiling luminaire, or similar object shall be considered
to be obstructed, and additional sprinklers shall be installed .
--
**6. A sidewall sprinkler is located within how many feet of the
center of a ceiling fan before it is considered obstructed?**
A. 1 foot
B. 2 feet
C. 3 feet
D. 5 feet
