Create an account
Evaporator section of the cooling system - Consists of two coils shaped like the letter "A"
A line or plane where insulation and air barriers exist in order to resist thermal transmission and air leakage throu or within a building shell
Metallic anode which is meant to be dissolved to protect other metallic components
White powdery deposit left by water that moves through masonry and leaves minerals from mortar or soild behind as it evaporates
Rise-Run Rate for vent connectors
1/4" rise over 1' run (Allows combustion gases to rise through the vent and prevent condensation from pooling & rusting the vent)
Heating Degree Days
Degrees when average temperature is below 65F ex: average temperature today is 50F=15HDD)
Segment of a three-dimensinal shape fabricated from a two-dimensional material (the parts of a duct elbow)
E=emissivity refers to building materials designed to reduce heat transfer through thermal conductivity
Shoving cellulosic insulation in at a rate of 3.5-4lbs per cubic foot, usually done on exterior walls
Long, continuous framing members that run from sill plate to eave line with intermediate floor structures nailed to them.
Usuallly an extruded foam rod placed into voids to insulate and allow a backing for application sealant
Net free area
The actual amount of area in a vent that is not the material itself (metal grills and louvers have have 60-75% net free area, wodden ones only 20-25%)
pocket door cavity
Where pocket cavities extend to exterior walls, shove strips of fiberglass into the door opening with a broom handle shallow enough so that door can close
The movement of air into and out of a building due to indoor/outdoor air density differences and natural bouyency
IFGC confined space
A room containing 1 or more combustion appliances that has less than 50 cubic fee of volume for every 1000 BTU/H of appliance output
Cold water dip tube
a plastic tube below the cold port of a water heater-carries cold water to the bottom of the tank & keeps it separated from the already-heated water at the top of the tank.
Overall heat transfer coefficient-describes how well a building element conducts heat (smaller the value the better)
A loop of wire wrapped around a metal core which produces a magnetic field when electricity runs through it (usually used in switches)
the process of ensuring that systems are designed, installed, functionally tested, and capable of being operated and maintained to perform to design intent.
Standard for acceptable IAQ 15 CF/M or outdoor air per person or .35 air changes per hour
First law of thermodynamics
Energy is neither created nor destroyed, but merely moves from place to place and changes form.
Second law of thermodynamics
Heat moves from high temperature regions to low temperature regions-never the reverse
The ability of water to move through materials, even upward against gravity through small tubes or spaces
A material or air space designed to stop capillary acton from carrying water into a building
Coefficient of Performance A heat pump or air conditioner's output in whatt-hours of heat moved divided by watt-hours of electrical input
Waterproof matterial used to prevent leakage at intersections between the roof surface at wall penetrations
Oxygen Depletion Sensor
A safety device for unvented combustion heaters that shuts gas off when oxygen is depleted
Framing members that sit on top of rafters, perpendicular to them, designed to spread support to roofing materials
A combustion appliance that draws combustion air from outdoors and has a sealed exhaust system
A decimal describing how much solar energy is transmitted through a window, compared to a clear, single glass, which has an SC of 1.0
Heat from the sun that is absorbed by a building and contributes to the need for cooling
Solar Heat-Gain Coefficient
The rato of solar heat gain through a window to incident solar heat. Includes both transmitted heat and absorbed and reradiated heat.
The ratio of a material's heat storage capacity to the heat storage capacity of water
An air conditioner that has the condenser and compressor outdoors and the evaporator indoors
The number of degrees Fahrenheit that a scondenser and nearby piping ools the liquid refrigerant below its saturation temperature
Rapid heat conduction resulting from direct contact between very thermally conductive materials like metal and glass
How much heat in BTUs flows through a 1" thick by 1' square foot slab of that material per hour when there is a 1-degree-Fahrenheit temperature difference between the slab's two surfaces
The temperature equaled or exceeded 97.5% of the time during the three coldest months: Dec, Jan & Feb
A roof truss in which the braces cross like scissors. Usually used for cathedral ceilings
A space that allows water storage and drainage in a wall cavity, adjacent to or part of the weather-resistant barrier.
A sheeting material that protects the materials behind it from reaching a temperature of 250F during a fire.
A fire barrier that prevents the spread of fire between rooms on one level of a building.
A structural fire barrier between buildings that is designed to remain intact and standing in, during and after a fire
Solar Heat Gain Coefficient
The ratio of solar heat passing through the glass to solar heat falling on the glass at a 90 degree angle.
Compares the solar transmittance of a glass assembly compared single-pane glass which has a SC of 1. Always less than 1
The force that brings combustion air into the combustion chamber and propels the combustion gases out through the venting system.
The percentage of the fuel's potential energy that actually heats the living space.
High Limit Control
Bimetal element attached to a switch in the burner's control circuit. Extinguishes the burner in the event of overheating.
Small Electric generator powered by heat from the pilot light or gas appliance. If the pilot light goes out, the current stops and the spring-loaded valve closes shutting off the gas.
Hydronic Heat Pump
Uses the refrigeration cycle to move heat from the earth or a body of water into the home through a hydronic distribution system
Reduces the heat loss from a furnace or boiler by closing off the chimney when the burner isn't operating.
Device for cooling homes in dry climates that cools the incoming air by humidifying it.
Method developed by the air conditioning Contractors of America to size heating and cooling equipment.
Tankless Water Heater
heats water as it flows through the heater, eliminating the need for a storage tank
Valves or loops of pipe that stop convection of hot water into the ht and cold water pipes ablove the storage water heater or external storage tank.
The part of a foundation system that actually transfers the weight of the building to the ground
A plastic or metal tube used for its stiffness to blow insulation inside a building cavity
An ambiguous term meaning either hot-water space heating or both hot water and steam space heating
a piece of lumber installed horizontally to which the vertical studs in a wall frame are attached
Air circulating back to the furnace from the house, to be heated by the furnace and supplied to the rooms.
the wires coming from the utility transformer to the service equipment of the building
A malfunction in an electrical circuit, where electricity is flowing through conductors without going through an electrical load like a light or motor.
A double coil of wire that reduces or increses voltage from a primary circuit to a secondary circuit
Plastic films, coated wiith a metallized reflective surface, that are adhered to window glass to reflect heat rays from the sun
a framing member crossing and supporting the ends of joists, studs, or rafters so as to transfer their weight to parallel joists, studs, or rafters
A colorless, odorless inert gas sometimes used in the spaces between the panes in energy efficient windows.
Safety device which opens (breaks) an electric circuit automatically when it becomes overloaded
A monumental projecting porch with a roof supported by columns, often placed at the entrance of a building
Beams that slope from the ridge of a roof to the eaves making the main body of the roof's framework
Concrete floor placed directly on earth or a gravel base and usually about four inches thick.
A fine plaster used for interior decoration and fine work also used for rough outside wall coverings
The first component of the framing, bolted to the foundation walls, supports the building while anchoring it to the foundation.
energy recovery ventilator
A ventilator that recovers latent and sensible energy from the exhaust airstream and imparts it to the incoming airstream.
Heating Seasonal Performance Factor
Rating for heat pumps describing how many BTUs they provide per watt-hour of electricity consumed
Apparatus that extracts heat from a liquid that is at a higher temperature than its surroundings
Must be worn when working in areas with mold, asbestos, lead, fiberglass or formaldehyde
Includes baseboard heaters (convectors) and radiant flooring that uses warm water as the heat source.
water-resistant wall built on top of a foundation and designed to lift vulnerable wall materials away from insects and water
Water-resistant column built on top of a foundation and designed to lift vulnerable materials away from insects and water.
disable or have it repaired
What should you do about the CO producing appliance before proceeding with additional diagnostics or inspections
combustion appliance safety inspection
CO test, draft measurement, spillage evaluation and worst case depressurization of CAS
When considering air sealing a house, which part should you give the highest priority?
Whenever changes to a building shell require a blower door test, what first needs to be calculated?
What is the correct action if final CFM50 is LOWER than BAS and less than .7XBAS
word relating to the space between walls in balloon framing where there can be convection currents.
Level 1 action for oven: recommend CO detector & a service call should be taken if SSE CO levels are:
300PPM or more
Level 2 Action for oven: unit must be serviced and if no improvements, install an exhause fan at 250 CFM if SSE CO levels are:
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together