ANS A device used for internal inspection of hard to see areas.
8. British Thermal Unit. BTU
ANS The amount of heat required to raise 1lb or water 1 degree Fahrenheit
9. CFM Cubic Feet Per Minute,
ANS as used to measure air flow
10. Clearance
ANS Distance between a heat producing appliance, chimney, chimney connector, vent, vent
connector or plenum, and other surfaces.
11. Combustion
ANS The rapid oxidation of fuel usually accompanied by the production of heat and light.
12. Combustion Chamber
ANS A heavily constructed area designed to withstand direct contact with combustion and to
optimize conditions necessary to burn fuel efficiently.
13. Confined Space
ANS A space whose volume is less than 50 cu ft per 1,000 btu/hr of the aggregate input rating
of all appliances installed in that space. Also defined as 512 cubic feet.
14. Connector
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