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NFI Core Review Class Test
Minimum clearance can be less than that only with labeled clearances
Minimum clearance for unlisted appliance - Correct Answer ✔ ✔ 36"
What is the closest distance a heating appliance that is properly ventilated and wall protected can be? - Correct Answer ✔ ✔ 12"
A masonry wall constructed directly against a combustible wall can reduce appliance clearance by...? - Correct Answer ✔ ✔ 33%
An opening is to be cut on an exterior wall of a house to accommodate a masonry chimney. The inside surface of the chimney is to be flush with the inside wall of the room. What is the minimum opening size in the wall if the chimney is 24" wide? - Correct Answer ✔ ✔ 28"
Single wall connector clearance is? - Correct Answer ✔ ✔ 18"
interior chimney needs a minimum clearance of___________ - Correct Answer ✔ ✔ 2"
exterior chimney needs a minimum clearance of___________ - Correct Answer ✔ ✔ 1"
4 Stages of combustion - Correct Answer ✔ ✔ 1. Moisture evaporation
- Release of combustible gases
- Ignition of combustible gas
- Char burning
The total energy produced by burning one pound of wood is approximately____________ - Correct Answer ✔ ✔ 8,600 BTUs
Catalytic converters can lower the ignition temperature of wood smoke to approximately - Correct Answer ✔ ✔ 500 degrees
____ times the appliance flue collar area for interior chimneys. - Correct Answer ✔ ✔ 2 and 3
The maximum chimney offset angle permitted in the United States is __________ degrees (from vertical). - Correct Answer ✔ ✔ 30 degrees
According to NFPA 211 and the IRC, a 3.5" brick wall with a 1" ventilated air space provides a __________ percent clearance reduction - Correct Answer ✔ ✔ 66%
According to NFPA 211 and the IRC, a 3.5" brick wall without ventilated air space provides a __________ percent clearance reduction. - Correct Answer ✔ ✔ 33%
According to NFPA 211 and the IRC, a 24 gauge sheet metal panel with a 1" ventilated air space provides a __________ percent clearance reduction when used as a ceiling protector. - Correct Answer ✔ ✔ 50%
The standard clearance to combustibles for an unlisted woodstove is ___________ inches. - Correct Answer ✔ ✔ 36"
What is UL 1618?
2 types of manufactured pads - Correct Answer ✔ ✔ Floor protection
- Type 1. Ember protection
- Type 2 thermal floor protection
Type 1 floor protection - Correct Answer ✔ ✔ can be used on appliances that do not require thermal protection
Type 2 floor protection - Correct Answer ✔ ✔ · for appliances req. to heave thermal protection
· must have an R value of 1.
· R value must equal or exceed minimum R value needed
Non catalytic 7.5 grams per hour
NSPS: 2 phases for woodstoves - Correct Answer ✔ ✔ 1st phase: current:4.5 grams per hour
2nd phase: by 2020:
2.5 grams per hour with cord wood
2.0 grams per our crib wood
Principles of draft and flow - Correct Answer ✔ ✔ · Exhaust flue gases to outside
· Protects home from hot gases and sparks
· Causes combustion air to be drawn in
Natural draft - Correct Answer ✔ ✔ · Force that moves air into the appliance and combustion by products out.
· Temperature difference between gasses in the system and air temp outside the system
Flow - Correct Answer ✔ ✔ Volume of gases that pass through venting system as a result of draft
House stack effect - Correct Answer ✔ ✔ · Heated portion of house taller than vent termination
· Leaks (recessed lighting, attic fan) open window in upper portion create greater chimney effect than vent
Mechanical draft - Correct Answer ✔ ✔ · Can correct venting issues
· Listed and installed according to instructions
Draft gauges is measured in____________ - Correct Answer ✔ ✔ Water Column Inches
Chimney connector pipe is the pipe coming of HA and connecting to chimney - Correct Answer ✔ ✔ -Cannot pass through roof, wall, ceiling, closet and concealed spaces
