process by which metal is heated to relieve stress, changing the metal’s strength and hardness
backer rod
small foam rod or cord used to fill gaps between building materials
blank piece
piece of material cut to size prior to notching or marking
brake
manual or power equipment used to bend and form metal; may be CNC or manually controlled
breeching
the portion of a combustion venting system between appliance and the chimney or stack used for exhausting fumes and gases
building envelope
a barrier between the interior and exterior environment of the building that serves as an outer shell to protect the indoor environment from elements such as moisture
burglar bars
heavy steel bars installed inside ductwork to prevent access
cladding
a material (metal or composite) that covers another material to provide a skin or a layer; it is intended to control infiltration of weather elements or for aesthetic purposes
code B-139
provides minimum requirements for the installation of, alteration to, or addition to oil-burning equipment, components and accessories
code B-149
provides safety requirements for the installation of natural gas and propane appliances, equipment, components, and accessories where gas is to be used for fuel purposes
coping (architectural)
material used as the capping of a wall
crimper
power or manual tool used to allow round or square sheet metal pipes that are the same size to be corrugated to fit together
damper
valve or plate that stops or regulates the flow of air or materials
duct traverse
series of evenly spaced pressure readings inside of a duct to measure various pressures at points within the duct
flashing
thin piece of sheet metal or other impervious material installed to prevent the passage of water into a structure from an angle or joint
interference drawings
drawings that show the coordinated layout of all mechanical, electrical, structural and architectural systems and how the placement of different systems may interfere with one another
isolation
product used between two dissimilar metals to prevent galvanic corrosion (used in roofing, air handling and material handling applications)
isolator
components that minimize noise, sound and vibration transfer
lagging
protects insulation from damage and provides a barrier around the insulation; it also creates a true, flat and even surface for aesthetic purposes
parallel line development
method of pattern development based upon lines at an equal distance at all points
plasma cutting
process used to cut metal using a plasma torch
radial line development
method of conical pattern development where all points radiate from a common apex
seam/lock
any process of connecting two pieces or two ends of metal together
shear
equipment or a process of cutting sheet metal
stake
equipment used in forming material by hand; usually found in a sheet metal shop
stand-offs
material or device used to create a gap between two layers of material
stretch-out
gross stretch-out: overall length of material, including locks and seams;
net stretch-out: overall length of material, not including locks and seams
strongback
support to keep a welding joint straight and prevent weld distortion
thermal insulation
material installed on the outside of duct used to reduce the rate of heat transfer
triangulation development
method of pattern development using right angle triangles and two known points to find a third unknown point
