CSIA 105 ACTUAL EXAM QUESTIONS AND
COMPLETE STUDY GUIDE 2026
▶ factory built fireplaces consist of...______, _______ & _______?
Answer:Firebox, damper, chimney
▶ corbels should not exceed ______ of the individual masonry unit height;
nor ________ its thickness? Answer:1/2, 1/3
▶ smoke chamber walls should be the ______ of the firebox?? Answer:full
width
▶ natural draft chimneys shall extend a MINIMUM of ______ ft above any
parapet wall within 10 feet? Answer:2 feet
▶ rectangular chimney liners with an aspect ratio greater than 2 to 1 are
sized to AT LEAST _______ the fireplace opening? Answer:1/8
▶ a level 2 inspection includes all aspects of level 1 - TRUE or FALSE??
Answer:TRUE
▶ How far must a chimney extend above the roofline?? Answer:3 Feet
(and at least 2ft taller than anything within 10ft)
▶ Gaps between firestopping and the chimney shall not exceed:?
Answer:1/16"
▶ 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"
COMPLETE STUDY GUIDE 2026
▶ factory built fireplaces consist of...______, _______ & _______?
Answer:Firebox, damper, chimney
▶ corbels should not exceed ______ of the individual masonry unit height;
nor ________ its thickness? Answer:1/2, 1/3
▶ smoke chamber walls should be the ______ of the firebox?? Answer:full
width
▶ natural draft chimneys shall extend a MINIMUM of ______ ft above any
parapet wall within 10 feet? Answer:2 feet
▶ rectangular chimney liners with an aspect ratio greater than 2 to 1 are
sized to AT LEAST _______ the fireplace opening? Answer:1/8
▶ a level 2 inspection includes all aspects of level 1 - TRUE or FALSE??
Answer:TRUE
▶ How far must a chimney extend above the roofline?? Answer:3 Feet
(and at least 2ft taller than anything within 10ft)
▶ Gaps between firestopping and the chimney shall not exceed:?
Answer:1/16"
▶ 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"
