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Term Definition
I Beam. A n American Standard designation for a particular section of hot-rolled steel which in cross section is shaped like a capital "I".  
I. 1. Represents the moment of inertia of a member. 2. Occupancy Importance Factor. 3. Represents Amperes.  
I.D. Inside diameter  
IAQ. Indoor Air Quality.  
IBC. International Building Code.  
ICBO. International Conference of Building Officials.  
ICC. International Code Council.  
ICC. Interstate Commerce Commission.  
Ice Cream Cabinet. Commercial refrigerator which operates at approximately 0° F. (-18° C.); used for storage of ice cream.  
Ice Dam. An ice obstruction along the eaves of a roof caused by the refreezing of water emanating from melting snow on the roof surface above.  
Ice Maker. An appliance that freezes water into ice chunks or cubes.  
Ice Melting Equivalent. The amount of heat absorbed by melting ice at 32° F. (0° C.) is 144 BTUs per pound of ice or 288,000 BTUs per ton; also called Ice Melting Effect  
Ice Storage Bin. A container which holds ice and maintains its solid properties.  
ID. 1. Inside Diameter. 2. Inside Dimension.  
Idiot Stick. see Layout Stick. See Story Pole, 2.  
Idler. Pulley used on some belt drives to provide proper belt tension and to eliminate belt vibration.  
Ignition Transformer. Transformer designed to provide a high- voltage current; used in many heating systems to ignite fuel; it provides a spark gap.  
IIAR. International Institute of Ammonia Refrigeration.  
IIC. Impact Insulation Class.  
IL. Intensity Level.  
ILIA. Indiana Limestone Institute of America, Inc.  
Illegal. Contrary to or against the law.  
Illiquid. Deficient in liquid assets.  
Illuminate. Light up, make bright, usually with electrical lighting.  
Ilmenite. A mineral having the theoretical composition FO TiO2used principally in the production of titanium oxide.  
IMC. Intermediate Metal Conduit.  
IME. 1. Ice Melting Equivalent. 2. Ice Melting Effect.  
IMI. International Masonry Institute.  
Immeasurable. Not measurable; immense.  
Immiscibility. Incapability of being mixed or made homogeneous.  

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