A type of furnace that takes cool air from the top and blows warm air to the bottom - common where your furnace must be located in a second-floor closet or utility area.
Downflow furnace
A furnace that pulls in cool return air from the top and blows/expels warm air at the bottom - common where your furnace must be located in a second-floor closet or utility area.
Downhand welding
Weld, also called a flat position weld, made on the upper, horizontal surface of the work, which has been laid flat or almost flat.
Downlight
A small light fixture recessed into the ceiling that usually concentrates the light in a downward direction. Synonyms.
Downspout
A conduit for carrying water from a gutter, scupper, drop outlet or other drainage unit from roof to ground level. Also known as a Leader Pipe.
Downspout leader
Downspout a spout or pipe to carry rain water down from a roof or gutters.
Downspout strap
A piece of metal which secures the downspout to the eaves or wall of a building.
Downstream
Water flowing in the direction of the current.
Downtime
Lost time when repairs are needed on a job in progress.
Downwind wind turbine
A horizontal axis wind turbine in which the rotor is downwind of the tower.
