Wood NFI questions well answered
already passed
In the 80's particulate emissions for affected appliances were required to be limited to: - correct
answer ✔✔4.1 grams/ hr(catalytic) & 7.5 grams/hr (noncatalytic)
The national regulations did not apply to appliances with: - correct answer ✔✔- burn rates
grater 5kg/hr (11lbs of wood)
- air-to flue ratio > 35 to 1
- firebox > 20 cubic feet
- weight > 800kg or 1760lbs
-coal
-open wood burning
- solid fuel furnaces & boilers
- large industrial and commercial wood fired appliances
Tests showed that these regulations from the 80's showed that - correct answer ✔✔Emissions
from certified appliances were 6kg/hr a reduction of 85%
May 2015 revised EPA regulations step 1 - correct answer ✔✔- wood, pellet stoves = 4.5gram
per hour limit
- Hydronic heaters have a 0.32 lbs per million BTU limit
- Forced air furnaces 0.93lbs per hour limit
May 15 2020 regulations for wood and pellet stoves - correct answer ✔✔- 2 grams per/hr crib
wood
,- 2.5 grams per/hr cordwood
Stages of solid fuel combustion - correct answer ✔✔1. Moisture Evaporation > 212F
2. Release of combustible gases > 500F
3. Ignition and combustion of vapors and gases 540-1,225F
4. Char burning > 900F
How much water is produced for each pound of wood burned. - correct answer ✔✔1/2 lb
At 100% combustion efficiency what byproducts would be produced - correct answer ✔✔-
Water vapor
- carbon dioxide
- non combustible ashes
4 factors that promote combustion efficiency - correct answer ✔✔- fuel
- temperature
- turbulence
- time
Chimney connector reduced clearances with wall and ceiling protection:
3 1/2 " thick masonry wall without ventilated airspace:
Max clearance reduction Wall & Ceiling
Min allowed clearance Wall & Ceiling - correct answer ✔✔Max Wall & Ceiling = 33% / —. Min
Allowed clearance = 12" / —
Chimney connector reduced clearances with wall and ceiling protection:
, 24 gauge sheet metal over 1" glass fiber or mineral batts reinforced with wire, or equivalent on
rear face, with at least 1" ventilated airspace
Max clearance reduction Wall & Ceiling
Min allowed clearance Wall & Ceiling - correct answer ✔✔Max Wall & Ceiling = 66% / 50% Min
allowed = 6"/9"
Chimney connector reduced clearances with wall and ceiling protection:
3 1/2 " thick masonry wall with ventilated airspace:
Max clearance reduction Wall & Ceiling
Min allowed clearance Wall & Ceiling - correct answer ✔✔Max Wall & Ceiling = 66% / — Min
allowed = 6"/ —
Chimney connector reduced clearances with wall and ceiling protection:
1/2" thick noncombustible insulation board over 1" glass fiber or mineral wool batts without
ventilated airspace.
Max clearance reduction Wall & Ceiling
Min allowed clearance Wall & Ceiling - correct answer ✔✔Max Wall & Ceiling = 50% / 33%. Min
allowed = 9" / 12"
Chimney connector reduced clearances with wall and ceiling protection:
24 gauge sheet metal with at least 1" of ventilated airspace
Max clearance reduction Wall & Ceiling
Min allowed clearance Wall & Ceiling - correct answer ✔✔Max Wall & Ceiling = 66% / 50% Min
allowed = 6"/ 9"
Chimney connector reduced clearances with wall and ceiling protection:
1/2" thick noncombustible insulation board with at least 1" ventilated airspace.
Max clearance reduction Wall & Ceiling
already passed
In the 80's particulate emissions for affected appliances were required to be limited to: - correct
answer ✔✔4.1 grams/ hr(catalytic) & 7.5 grams/hr (noncatalytic)
The national regulations did not apply to appliances with: - correct answer ✔✔- burn rates
grater 5kg/hr (11lbs of wood)
- air-to flue ratio > 35 to 1
- firebox > 20 cubic feet
- weight > 800kg or 1760lbs
-coal
-open wood burning
- solid fuel furnaces & boilers
- large industrial and commercial wood fired appliances
Tests showed that these regulations from the 80's showed that - correct answer ✔✔Emissions
from certified appliances were 6kg/hr a reduction of 85%
May 2015 revised EPA regulations step 1 - correct answer ✔✔- wood, pellet stoves = 4.5gram
per hour limit
- Hydronic heaters have a 0.32 lbs per million BTU limit
- Forced air furnaces 0.93lbs per hour limit
May 15 2020 regulations for wood and pellet stoves - correct answer ✔✔- 2 grams per/hr crib
wood
,- 2.5 grams per/hr cordwood
Stages of solid fuel combustion - correct answer ✔✔1. Moisture Evaporation > 212F
2. Release of combustible gases > 500F
3. Ignition and combustion of vapors and gases 540-1,225F
4. Char burning > 900F
How much water is produced for each pound of wood burned. - correct answer ✔✔1/2 lb
At 100% combustion efficiency what byproducts would be produced - correct answer ✔✔-
Water vapor
- carbon dioxide
- non combustible ashes
4 factors that promote combustion efficiency - correct answer ✔✔- fuel
- temperature
- turbulence
- time
Chimney connector reduced clearances with wall and ceiling protection:
3 1/2 " thick masonry wall without ventilated airspace:
Max clearance reduction Wall & Ceiling
Min allowed clearance Wall & Ceiling - correct answer ✔✔Max Wall & Ceiling = 33% / —. Min
Allowed clearance = 12" / —
Chimney connector reduced clearances with wall and ceiling protection:
, 24 gauge sheet metal over 1" glass fiber or mineral batts reinforced with wire, or equivalent on
rear face, with at least 1" ventilated airspace
Max clearance reduction Wall & Ceiling
Min allowed clearance Wall & Ceiling - correct answer ✔✔Max Wall & Ceiling = 66% / 50% Min
allowed = 6"/9"
Chimney connector reduced clearances with wall and ceiling protection:
3 1/2 " thick masonry wall with ventilated airspace:
Max clearance reduction Wall & Ceiling
Min allowed clearance Wall & Ceiling - correct answer ✔✔Max Wall & Ceiling = 66% / — Min
allowed = 6"/ —
Chimney connector reduced clearances with wall and ceiling protection:
1/2" thick noncombustible insulation board over 1" glass fiber or mineral wool batts without
ventilated airspace.
Max clearance reduction Wall & Ceiling
Min allowed clearance Wall & Ceiling - correct answer ✔✔Max Wall & Ceiling = 50% / 33%. Min
allowed = 9" / 12"
Chimney connector reduced clearances with wall and ceiling protection:
24 gauge sheet metal with at least 1" of ventilated airspace
Max clearance reduction Wall & Ceiling
Min allowed clearance Wall & Ceiling - correct answer ✔✔Max Wall & Ceiling = 66% / 50% Min
allowed = 6"/ 9"
Chimney connector reduced clearances with wall and ceiling protection:
1/2" thick noncombustible insulation board with at least 1" ventilated airspace.
Max clearance reduction Wall & Ceiling
