Chimney Systems & Inspections Flashcards

A homeowner switched from an oil furnace to a wood stove using the same flue. Under NFPA 211, what is the minimum inspection level required?

Answer: Level 2

NFPA 211 requires a Level 2 inspection when there is a change in fuel type or appliance.

Which situation most clearly justifies a Level 3 inspection?

Answer: A Level 2 inspection revealed a hazard that can only be assessed by accessing concealed areas

Level 3 is warranted when a Level 1 or 2 inspection suggests a hidden hazard requiring removal of building components.

Per the commonly cited 3-2-10 rule, a masonry chimney must extend at least how far above any part of the building within 10 feet horizontally?

Answer: 2 feet

The chimney must be 3 feet above the roof penetration and 2 feet higher than anything within 10 feet.

During a sweep you find puffy, honeycombed creosote and a warped damper plate. What do these findings most strongly indicate?

Answer: A previous chimney fire

Puffed 'honeycomb' creosote and heat-warped metal are classic evidence of a past chimney fire.

What is the maximum horizontal run commonly allowed for a chimney connector relative to the chimney height above the connector entry?

Answer: 75% of the vertical chimney height

NFPA 211 limits horizontal connector length to 75% of the chimney's vertical height above the connector.

Single-wall connector sections should be installed with the crimped (male) ends pointing which way?

Answer: Toward the appliance (downward)

Crimped ends point toward the appliance so condensate and creosote run back inside rather than leaking out.

Which listing standard applies to factory-built chimneys rated for residential solid-fuel appliances (HT type)?

Answer: UL 103

UL 103 covers factory-built chimneys, with the HT designation tested to 2100°F.