Ventilation For Your Home

If too little outdoor air enters a home, pollutants can sometimes accumulate to levels that can pose health and comfort problems. Likewise, one approach to lowering the concentrations of indoor air pollutants in your home is to increase the amount of outdoor air coming in.

Outdoor air enters and leaves a house by: infiltration, natural ventilation, and mechanical ventilation. In a process known as infiltration, outdoor air flows into the house through openings, joints, and cracks in walls, floors, and ceilings, and around windows and doors (air may also move out of the house in this manner — this is called exfiltration). In natural ventilation, air moves through opened windows and doors. Air movement associated with infiltration and natural ventilation is caused by air temperature differences between indoors and outdoors and by wind.

Finally, there are a number of mechanical ventilation devices, from exhaust (vented outdoors) fans that intermittently remove air from a single room, such as bathrooms and the kitchen, to air handling systems that use fans and duct work to continuously remove indoor air and distribute filtered and conditioned outdoor air to strategic points throughout the house. The rate at which outdoor air replaces indoor air is described as the air exchange rate. When there is little infiltration, natural ventilation, or mechanical ventilation, the air exchange rate is low and pollutant levels can increase.

Your Home’s Ventilation System Could Be Costing You $$$

Unless they are built with means of mechanical ventilation, homes that are designed and constructed to minimize the amount of outdoor air that can “leak” into and out of the home may have higher pollutant levels than other homes. However, because some weather conditions can drastically reduce the amount of outdoor air that enters a home, pollutants can build up even in homes that are normally considered “leaky.”

Most home heating and cooling systems, including forced air heating systems, do not mechanically bring fresh air into the house. Opening windows and doors, operating window or attic fans, when the weather permits, or running a window air-conditioner with the vent control open increases the ventilation rate. Local bathroom or kitchen fans that exhaust outdoors remove contaminants, including moisture, directly from the room where the fan is located and also increase the outdoor air ventilation rate.

Ideally, new homes will be built to minimize leakage to control energy loss, improve comfort, and minimize the transport of moisture and pollutants through the building shell. These homes should then also have mechanical ventilation to remove pollutants generated in the home and provide outdoor air in a controlled manner.

Heating, Ventilation, and Air-Conditioning (HVAC) Systems

Whether a mechanical ventilation system makes sense in your existing homes depends on the house, your existing heating, ventilation, and air-conditioning (HVAC) system, and the changes you have planned. You should discuss this with your Minnesota Heating & Air Conditioning Contractor. A local Weatherization office, or building performance contractor, might also be able to help you with this decision or point you to local experts.

Tight buildings reduce energy costs, but can also trap humidity and pollutants that may aggravate allergies and cause general discomfort, as well as damage windows and other parts of the building shell.

Today heat-recovery ventilators, also known as heat exchangers or energy recovery ventilators, enhance air quality and reduce overall energy costs. These systems bring in fresh air from the outside, preheat the incoming air during the winter and pre-cool the incoming air during the summer.

Once a home is well insulated and ventilated, other measures can be taken to conserve electricity, befriend the environment and lower costs.

U.S. Dept. of Energy, Energy, Efficiency & Renewable Energy’s “Guide to Home Ventilation” (PDF). www1.eere.energy.gov/buildings/openhouse/pdfs/ventilation_factsheet16.pdf

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