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Safety GogglesYour eyes are vulnerable. Here is how to protect them.
Sealed CombustionA system in some furnaces, boilers, fireplaces, and water heaters that is immune to pressure imbalances in a house because it draws combustion air from the outdoors into a sealed chamber and expels by-products to the outdoors.
Secondary VentilationVentilation for the quick removal of air pollutants from near a source. See also local-exhaust ventilation.
SEERSeasonal Energy Efficiency Ratio (SEER).
Sensible HeatThe amount of heat involved in raising or lowering the temperature of air, not including any heat required to cause water vapor to change state (e.g. from a gas to a liquid).
Sensible Recovery Efficiency (SRE)A measurement, that does not include latent heat recovery, used in determining the amount of energy passed between airstreams in a heat or energy recovery ventilator.
SeparationThe principle of isolating pollutants from the living space.
Shaded-Pole MotorA type of low-cost, usually inefficient, motor whose starting torque is provided by a permanently short-circuited auxiliary winding.
SheathingSheathing adds strength and wind resistance to house walls, and is now made in a variety of materials.
Sick Building SyndromeThe term "sick building syndrome" (SBS) is used to describe situations in which building occupants experience acute health and comfort effects, but no specific illness or cause can be identified.
Single-Port VentilatorAn exhaust device having only one suction connection for a duct from the living space. See also multi-port ventilator.
SIP or Structural Insulated PanelStructural insulated panels (SIPs) are high performance building panels used in floors, walls, and roofs for residential and light commercial buildings.
Solid-state lighting (SSL)Solid-state lighting (SSL) technology uses semi-conducting materials to convert electricity into light. Light-emitting diodes (LEDs) are an example.
SoneA linear unit of sound measurement used to express sound intensity. Two sones are twice as loud as one sone.
Sone RatingA sone is a measurement of loudness typically applied to ventilation fans.
Sound AttenuatorA device, similar to an automotive muffler, that can be used to absorb some of the sound generated in a ventilation system.
Source ControlThe principle of using nonpolluting materials in the living space, or of removing polluting materials from the living space.
SpillageA situation where some of the combustion by-products spill into the living space, rather than go up the chimney, usually due to insufficient draft.
Spot VentilationVentilation for the quick removal of air pollutants from near a source. See also local-exhaust ventilation.
Spray-On InsulationInsulation products that start out as a liquid, but end up as a solid.
Squirrel-Cage FanA ventilating fan with blades resembling a squirrel cage or hamster wheel, often used in furnaces and ventilating devices.
Stack EffectThe naturally occurring phenomena of warm air exerting pressure on cooler air that results in warm air rising.
Stale AirThe air leaving a house through a ventilation system.
Static PressureThe amount of pressure exerted against the walls of a duct or airway, created by the friction and impact of air as it moves.
Static Pressure DropThe change in pressure resulting from resistance to airflow.
Strain HygrometerA relative-humidity sensing device containing a spiral-wound material that is sensitive to changes in relative humidity.
Supply AirThe air entering a house through a ventilation system. Also, the conditioned air passing from a furnace/air conditioner into the living space.
Supply GrilleA grille through which fresh air enters a room. See also Exhaust grille.
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.
Supply-Only VentilationA general ventilation strategy that uses either a supply ventilation fan or a forced-air heating/cooling fan to draw air into a house.
SynergismThe interaction of two substances such that the combined effect is greater than the sum of the individual effects.
SystemThe dynamic interrelationship of components designed to fulfill a purpose.

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