Components
Canonical parts and interfaces that connect symptoms to systems and repair boundaries.
Air supply register
Terminal delivering conditioned or outdoor air into a room.
Attic hatch
Access opening through the ceiling air and thermal control layers.
Bathroom exhaust fan
Mechanical extract point intended to remove humid air near its source.
Boiler
Appliance heating water for space heating or domestic use.
Carbon monoxide alarm
Device intended to warn of dangerous carbon monoxide levels.
Chimney
Masonry or metal flue enclosure crossing the roof and interior assemblies.
Condensate drain
Pipe or channel removing water generated by cooling or high-efficiency appliances.
Crawl-space vent
Opening connecting a crawl space to outdoor air.
Dishwasher connection
Water, drain and electrical connections serving a dishwasher.
Downspout
Vertical pipe carrying roof runoff to grade or drainage.
Drain cleanout
Access fitting for inspection and clearing of drainage pipes.
Dryer exhaust duct
Duct carrying warm moist lint-laden air outdoors.
Electrical outlet
Connection point containing terminals, conductors and protective enclosure.
Electrical panel
Enclosure containing breakers, busbars and circuit terminations.
Exterior door threshold
Lower weather detail at an exterior doorway.
Floor drain
Drainage opening with trap and waterproofing interface.
Floor joist
Repeated horizontal member supporting a floor.
Foundation wall
Below- or near-grade wall transferring loads and retaining soil.
Gutter
Channel collecting roof runoff at the eaves.
Heat-pump indoor unit
Indoor coil, fan and condensate system transferring heat to or from room air.
Insulated glass unit
Factory-sealed panes separated by a spacer and dry cavity.
Junction box
Protected enclosure for electrical conductor connections.
Load-bearing wall
Wall transferring loads from floors or roof to supports below.
Plumbing trap
Water-filled bend blocking sewer gas while allowing drainage.
Radiator
Heat emitter using hot water, steam or electricity.
Range hood
Kitchen extract appliance removing heat, moisture and contaminants.
Recessed ceiling light
Light fixture penetrating ceiling finishes and sometimes the air barrier.
Return air grille
Opening drawing room air back to air-handling equipment.
Roof flashing
Metal or membrane detail that redirects water at edges, walls, chimneys and penetrations.
Roof truss
Engineered framing assembly carrying roof loads.
Roof vent
Weather-protected opening for exhaust or attic ventilation.
Skylight
Glazed roof opening with curb, flashing, seals and interior shaft.
Slab edge
Perimeter of a concrete floor slab where heat, moisture and loads interact.
Smoke alarm
Device intended to detect smoke and warn occupants.
Sump pump
Pump removing collected groundwater or drainage water.
Toilet seal
Hidden seal connecting a toilet outlet to the drain flange.
Washing-machine hose
Flexible pressurized connection between supply valve and appliance.
Water heater
Tank or instantaneous appliance producing domestic hot water.
Window frame
Structural frame holding glazing and connecting the opening to the wall.
Window sill
Sloped lower surface intended to shed water away from the opening.
