Fireplaces

Question 1

What clearances are required for unlisted wood stoves?

Answer 1

• 48 inches from walls (36” if walls are shielded)
• 48 inches from front
• 60 inches from top

Question 2

What makes a good chimney cap?

Answer 2

• Free of cracks
• 4 inches thick
• Capillary break
• Flexible sealant at liner joint
• Sloped to drain away water
• Flashing
• 2 inch projection

Question 3

What is the purpose of a chimney cap?

Answer 3

Keep water from damaging the chimney, brick, and mortar joints?

Question 4

What are the 2 main causes of chimney deterioration?

Answer 4

Condensation and moisture.

Question 5

Foundations for masonry fireplaces and their chimneys should be at least ____ inches thick, and should extend at least ____ inches beyond the face of the fireplace or support wall on all sides?

Answer 5

> 12 inches thick.

Extend >6” beyond face of the fireplace or support walls.

Question 6

When should crickets be provided for chimneys?

Answer 6

When the dimension parallel to the ridgeline is greater than 30 inches and does not intersect the ridgeline.

Question 7

What is allowable for corbelling in a masonry chimney?

Answer 7

1 inch maximum per course, with total corbel not exceeding 1/3 of total wall thickness.

Question 8

What is often required for fireplace inserts?

Answer 8

Chimney liner (stainless steel)

Question 9

What clearance from the fireplace opening is required for combustibles that project more than 1 1/2 inches from the face of the opening?

Answer 9

12 inches.
(6 inches at sides)

Question 10

What clearance from the fireplace opening is required for combustibles that project 1.5 inches or less from the face of the opening?

Answer 10

6 inches.
(6 inches at sides)

Question 11

Are are the minimum dimensions of a fireplace hearth on the sides and front of the firebox, if the opening is LESS than 6 sq.ft. ?

Answer 11

8 inches on sides.
16 inches in front.

Question 12

Are are the minimum dimensions of a fireplace hearth on the sides and front of the firebox, if the opening is MORE than 6 sq.ft. ?

Answer 12

12 inches on sides.
20 inches in front.

Question 13

When the auto-ignition temperature of the wood is reduced, this is called _________.

Answer 13

Pyrolysis.

Question 14

What component is required on all vent-less logs?

Answer 14

ODS (Oxygen Depletion Sensor).

Question 15

When will an ODS shut off the log set in a vent-less log system?

Answer 15

When oxygen levels fall below 18%. (21% is normal)

Question 16

Where are vent-less logs permitted to be installed?

Answer 16

In a solid fuel burning fireplace OR approved vent-less firebox enclosure.

Question 17

What should be done with abandoned flue openings?

Answer 17

Properly filled to prevent overheating or leakage of exhaust products. (ex. sheet metal plate)