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CADRLook for these numbers when comparing portable room air cleaners.
Canadian Standards Association (CSA)An organization that maintains standards used to certify products for safety, rate products for performance and to complement the requirements in codes.
CandlesThey create a warm, cozy atmosphere — and present some hazards as well.
Capital CostThe installed cost of equipment.
Carbon Dioxide (CO2)A colorless, odorless gas released in exhaled breath, or by combustion processes.
Carbon Monoxide (CO)A colorless, odorless, poisonous gas released during the incomplete combustion of carbon-containing fuels.
Carbon Monoxide AlarmEvery home should have at least one CO detector.
Carbon-Dioxide SensorA device that senses the carbon dioxide concentration in the air and can be used to control a ventilation system.
CarcinogenA substance that tends to cause cancer.
Castile SoapSoap made from a variety of vegetable oils that is a healthy alternative for allergy sufferers and those with sensitive skin.
Category A RoomA room, such as a bedroom or living room, that is often occupied for long periods and requires general ventilation.
Category B RoomA room, such as a kitchen or bathroom, in which moisture or pollutants are generated, that has special ventilation requirements.
CaulkA product that’s essential to a well sealed home.
Central Vacuum SystemCentral vacuums have a number of advantages over portable units.
Central VentilationAny general-ventilation strategy, i.e., balanced, central-supply or central-exhaust; with or without heat or energy recovery.
Central-Exhaust VentilationA general-ventilation strategy that uses an exhaust fan to remove air from a house.
Central-Supply VentilationA general ventilation strategy that uses either a supply ventilation fan or a forced-air heating/cooling fan to draw air into a house.
Centrifugal FanA ventilating fan with blades resembling a squirrel cage or a hamster wheel, often used in furnaces and ventilating devices.
CFLCompact fluorescent lamps offer great energy savings over traditional incandescent or halogen lighting. There are trade-offs, however.
Chemical SensitivityChemical sensitivity is hypersensitivity or intolerance to numerous chemicals at very low exposures or concentrations.
ChimneyA vertical structure or conduit that usually carries combustion by-products out of a house.
Chlorofluorocarbons (CFCs)Chlorofluorocarbons define a category of chemicals which contain chlorine, fluorine and carbon.
Circulating AirAir that moves from room to room or throughout a house.
Combustion AirAir that enters a house specifically to be used in the combustion of a fuel.
Combustion By-ProductsGases and particulates released during the burning of a fuel.
Combustion GasesGases released during the combustion of heating and other fuels that can include carbon monoxide, sulfur dioxide, and nitrogen dioxide.
Combustion-Air DuctA duct through which combustion air travels from the outdoors to a combustion device.
ConcreteDurable, versatile material made of four main ingredients: cement, aggregate, water, and admixtures.
Concrete-Slab FoundationsEasily constructed in a healthy manner, it can be part of a house foundation or built separately from the footings and foundation wall.
CondensationThe changing of a gas or vapor into a liquid, accompanied by the release of heat.
Conditioned SpaceThe part of a house, within the building envelope, that is kept at comfortable controlled temperature and humidity levels.
Controlled PressureAn air-pressure difference between the indoors and the outdoors, purposefully induced by ventilation equipment.
Controlled VentilationPurposeful air movement into and out of a building in a regular way.
Convective Air CurrentsThe movement of air resulting from heat transference through the air by convection.
Crawl Space FoundationsUnlike basement foundations, a crawl space is not considered part of a home’s living space. Crawl spaces are usually accessed only to repair pipes, ducts or mechanical equipment.
Cubic Feet Per Minute (CFM)A unit of measurement used to rate a fan’s capacity.

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