Spot ventilation can improve the effectiveness of natural and whole-house ventilation by removing indoor air pollution and/or moisture at its source. Spot ventilation includes the use of localized exhaust fans, such as those used above kitchen ranges and in bathrooms. ASHRAE recommends intermittent or continuous ventilation rates for bathrooms of 50 or 20 cubic feet per minute and kitchens of 100 or 25 cubic feet per minute, respectively.

When mapping out a ventilation strategy, consider the following:

• Fresh air (Supply) ventilation: bedrooms, living and dining rooms
• Exhaust air ventilation: kitchen, bathrooms, utility rooms
• Appliance and HVAC unit ventilation - gas appliances, furnaces, hot water tanks.