Acronyms/Abbreviations 307
Header HDR
Hardware HDW
Hardwood HDWD
Heat Exchanger HE
Hemlock HEM
Handhole HH
Head Joint HJT
Hook (s) HK
Hollow Metal HM
Humidity HMD
Horizontal HOR, HORIZ
Horsepower HP
Heat-recovery Unit HRU
Height HT
Heating HTG
Heater HTR
Heating/Ventilating/Air Conditioning HVAC
Hot and Cold Water H&CW
Hot Water HW
Hardwood HWD
Hot Water Heater HWH
Hot Water Tank HWT
Hexagonal HX
Hydrant HYD
Hertz HZ
Iron I
Indoor Air Quality IAQ
I Beam IB
Inside Diameter ID
Interior Design ID
Inside Face IF
Interlock ILK
Illuminate ILLUM
Inch(es) IN
Incinerator INCIN
Include (d), (ing) INCL
Inch Pound(s) IN LB
Incandescent INCAN
Inflammable INFL
Information INFO
Insulating Concrete INSC
Insulating Fill INSFInsulate (d), (ion) INSUL
Interior INT
Intermediate INTM
Invert INV
Iron Pipe IP
Iron Pipe Size IPS
International Standards Organization ISO
Indirect Vent IV
Joist J, JSTS
Junction Box JB
Janitor's Closet JC
Junction JCT
Junction Box J-Box
Joint Filler JF
Jamb JMB
Joist JST
Joint JT
Kiln Dried KD
Knocked Down KD
Kilogram KG
Kitchen KIT
Kiloliter KL
Kilometer KM
Knockout KO
Kick Plate KPL
Kilovolt-Ampere KVA
Kilowatt KW
Kilowatt-Hour KWH
Left L
Length L, LGTH
Line L
Laboratory LAB
Ladder LAD
Laminate (d) LAM
Laminated Glass LAM GL
Laundry LAU
Lavatory LAV
Lag Bolt LB
Pound LB.
Label LBL
Labor LBR