CSIA 105 LATEST EXAM PREP QUESTIONS
AND ANSWERS PDF 2026
▶ Thimbles for chimneys or vent connectors shall be made of either _____
or ________ with a minimum thickness of_________.? Answer:fireclay, or
galvanized steel, 24 gauge
▶ Round chimney flues shall have a minimum net cross-sectional area of
at least _______ the fireplace opening.? Answer:one-twelfth (1/12)
▶ Square chimney flues shall have a minimum net cross-sectional area of
at least _______ the fireplace opening.? Answer:one-tenth (1/10)
▶ Rectangular and oval chimney flues with an aspect ratio of LESS THAN
2 to 1 shall have a minimum net cross-sectional area of at least _______
the fireplace opening.? Answer:one-tenth (1/10)
▶ Rectangular and oval chimney flues with an aspect ratio of 2 to 1 OR
MORE shall have a minimum net cross-sectional area of at least _______
the fireplace opening.? Answer:one-eighth (1/8)
▶ Exterior unlisted metal chimneys shall have a clearance of not less than
____ from any combustible.? Answer:18 inches
▶ What thickness of steel must a pipe connector be if its diameter is less
than 6"?? Answer:26 gauge (0.019)
▶ What thickness of steel must a pipe connector be if its diameter is
greater than or equal to 6" to less than or equal to 10"? (≥6 to ≤10)?
Answer:24 gauge (0.024)
▶ What thickness of steel must a pipe connector be if its diameter is
greater than 10" to less than or equal to 16"? (>10 to ≤16)? Answer:22
gauge (0.029)
, ▶ What thickness of steel must a pipe connector be if its diameter is
greater than 16"?? Answer:16 gauge (0.056)
▶ The horizontal connector must not be more than 50% of the vertical
height of the chimney for?? Answer:Solid fuel burning appliances
▶ The horizontal connector must not be more than 75% of the vertical
height of the chimney for?? Answer:All appliances other than solid fuel
burning appliances
▶ Single wall Vents or connectors for Gas appliances (w/o draft hoods) and
oil and solid-fuel burning appliances need ____ inches clearance to
combustibles.? Answer:18"
▶ Single wall Chimney vents or connectors to listed gas appliances with
draft hoods need ____ inches to combustibles.? Answer:6"
▶ Connectors shall maintain a pitch or rise of at least ____ per foot.?
Answer:1/4"
▶ The fireplace throat or damper shall be located a minimum of ___ above
the top of the fireplace opening.? Answer:8"
▶ The smoke chamber height shall not be greater than the inside width
of...? Answer:the fireplace room opening
▶ The minimum thickness of a fireplace hearth shall be...? Answer:4"
▶ Combustible material above and projecting more than 1 1/2" from the
fireplace opening shall not be placed less than ____ inches from the top of
the opening.? Answer:12"
▶ Combustible material shall not be placed within ___ inches of a fireplace
opening.? Answer:6"
▶ Where the fireplace opening is less than 6 square ft (<72") the hearth
extension shall extend...? Answer:at least 16" in front of facing material,
and at least 8" beyond each side of the fireplace opening.
AND ANSWERS PDF 2026
▶ Thimbles for chimneys or vent connectors shall be made of either _____
or ________ with a minimum thickness of_________.? Answer:fireclay, or
galvanized steel, 24 gauge
▶ Round chimney flues shall have a minimum net cross-sectional area of
at least _______ the fireplace opening.? Answer:one-twelfth (1/12)
▶ Square chimney flues shall have a minimum net cross-sectional area of
at least _______ the fireplace opening.? Answer:one-tenth (1/10)
▶ Rectangular and oval chimney flues with an aspect ratio of LESS THAN
2 to 1 shall have a minimum net cross-sectional area of at least _______
the fireplace opening.? Answer:one-tenth (1/10)
▶ Rectangular and oval chimney flues with an aspect ratio of 2 to 1 OR
MORE shall have a minimum net cross-sectional area of at least _______
the fireplace opening.? Answer:one-eighth (1/8)
▶ Exterior unlisted metal chimneys shall have a clearance of not less than
____ from any combustible.? Answer:18 inches
▶ What thickness of steel must a pipe connector be if its diameter is less
than 6"?? Answer:26 gauge (0.019)
▶ What thickness of steel must a pipe connector be if its diameter is
greater than or equal to 6" to less than or equal to 10"? (≥6 to ≤10)?
Answer:24 gauge (0.024)
▶ What thickness of steel must a pipe connector be if its diameter is
greater than 10" to less than or equal to 16"? (>10 to ≤16)? Answer:22
gauge (0.029)
, ▶ What thickness of steel must a pipe connector be if its diameter is
greater than 16"?? Answer:16 gauge (0.056)
▶ The horizontal connector must not be more than 50% of the vertical
height of the chimney for?? Answer:Solid fuel burning appliances
▶ The horizontal connector must not be more than 75% of the vertical
height of the chimney for?? Answer:All appliances other than solid fuel
burning appliances
▶ Single wall Vents or connectors for Gas appliances (w/o draft hoods) and
oil and solid-fuel burning appliances need ____ inches clearance to
combustibles.? Answer:18"
▶ Single wall Chimney vents or connectors to listed gas appliances with
draft hoods need ____ inches to combustibles.? Answer:6"
▶ Connectors shall maintain a pitch or rise of at least ____ per foot.?
Answer:1/4"
▶ The fireplace throat or damper shall be located a minimum of ___ above
the top of the fireplace opening.? Answer:8"
▶ The smoke chamber height shall not be greater than the inside width
of...? Answer:the fireplace room opening
▶ The minimum thickness of a fireplace hearth shall be...? Answer:4"
▶ Combustible material above and projecting more than 1 1/2" from the
fireplace opening shall not be placed less than ____ inches from the top of
the opening.? Answer:12"
▶ Combustible material shall not be placed within ___ inches of a fireplace
opening.? Answer:6"
▶ Where the fireplace opening is less than 6 square ft (<72") the hearth
extension shall extend...? Answer:at least 16" in front of facing material,
and at least 8" beyond each side of the fireplace opening.
