Info

of

Types

Concentration

in

and

and Annual

Method

Operation

Applicable

Reduction, %

Effectiveness

Applicability

Moderate

Natural ventilation

Exchanges air causing replacement and dilution of indoor air with outdoor air by uniformly opening windows and vents

Alla

Moderate

Opening windows and air vents uniformly around house

Air exchange rates up to 2 air changes per hour (ACH) attainable Can require energy and comfort penalties and loss of living space use

No installation cost

Operating costs for additional heating range up to 3.4-fold increase from normal (0.25 ACH) ventilation conditions.

Forced-air ventilation

Exchanges air causing replacement and dilution of indoor air with outdoor air by fans located in windows or vent openings

Moderate

Continuous operation of a central fan with fresh air makeup, window fans, or local exhaust fans

Forced air ventilation used to increase air exchange rates to 2 ACH

Can require energy and comfort penalties and loss of living space use

Installation costs range up to $150.

Operating costs range up to $100 for fan energy and up to 3.4-fold increase in normal (0.25 ACH)

heating energy costsc.

Forced-air

Exchanges air

All

90b

Moderate to

Continuous

Installation costs

ventilation with

causing re-

0 0

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