A coating applied to the surface of the glazing of a window to reduce heat transfer through the window.
Low-flow solar water heating systems
The flow rate in these systems is 1/8 to 1/5 the rate of most solar water heating systems. The low-flow systems take advantage of stratification in the storage tank and theoretically allows for the use of smaller diameter piping to and from the collector and a smaller pump.
Low-income housing
Housing specifically intended for those people living below a specified income level.
Low-lift grout method
Pouring grout into openings in a concrete wall every few courses, which adds more stability to the wall.
Low-pressure sodium lamp
A type of lamp that produces light from sodium gas contained in a bulb operating at a partial pressure of 0.13 to 1.3 Pascal. The yellow light and large size make them applicable to lighting streets and parking lots.
Low-slope application
Method of installing asphalt shingles on roof slopes between 2 and 4 inches per foot.
Low-voltage
Usually 12 volts but sometimes 24 volts.
Lowball offer
Offer made to a seller that is substantially below market value.
Lower (net) heating value
The lower or net heat of combustion for a fuel that assumes that all products of combustion are in a gaseous state.
Lower explosive limit
Lowest percentage, in the air, of an explosive or flammable substance, which can explode or burn.
