Do I still use a kitchen exhaust fan? What if I have a “high CFM” fan?

A kitchen exhaust fan is still needed to remove grease and combustion gases. High capacity kitchen exhaust systems (downdraft or range hood with an airflow of greater than 250 CFM) present problems with natural draft combustion appliances and separate makeup air will be needed.

Heat Recovery Ventilators (HRV's) - Seattle, WA

Environix specializes in installing Heat Recovery Ventilators (HRV's) in new and existing construction throughout the Puget Sound. Call today for a free quote!

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Toll Free: 1-800-351-9563

Email: sales@environix.com

Q.  What purpose do Heat Recovery Ventilators serve?
A.  They provide an energy efficient way to bring in fresh filtered air while removing stale air.

A heat recovery ventilator (HRV) brings in fresh air from the outside, preheats the incoming air during the winter and precools the incoming air during the summer. It can provide clean fresh air every day while helping to keep energy costs low.

The American Lung Association recommends HRVs and sealing of air leaks to protect your health while conserving energy.

The HRV unit can connect to existing ductwork.

1. One set of ducts collects stale moist air from the kitchen, laundry and bathrooms. This stale contaminated air passes through the HRV unit and is exhausted to the outside.

2. The other ducting system draws in fresh clean air from outdoors through the HRV unit.

3. As the two air streams pass each other within the heat exchanger core, heat is transferred from the outgoing stale air to the fresh incoming air. There is no mixing of air streams.

4. The HRV unit is able to capture up to 85% of the energy from the outgoing stale air. Filtered, preconditioned fresh air is delivered where you need it - in the living areas of your home.

Q.  Why is an HRV Useful?

A.  Tight buildings reduce energy costs by keeping in the heated or air conditioned air. But tight buildings without adequate ventilation trap humidity and pollutants so they feel "stuffy", aggravate allergies and cause general discomfort for you and your family. Moisture damage to windows and other parts of the building shell can result when humidity is too high.

HRV or ERV?

Q.  Why not just open a window? Isn't the old-fashioned way the best?

A.  An open window doesn't filter the incoming air or accurately control ventilation rates. An HRV is designed to be energy efficient and exchange the air to:

1. Bring in fresh air you want at a rate you choose,
2. Clean the incoming air,
3. Exhaust stale air, pollutants, and moisture, while
4. Recovering up to 85% of the heating or cooling energy.

An open window can't do all these things for you.

Q.  I already have an energy-efficient heating and air conditioning system. Isn't that enough?

A.  Maybe, but do you ever notice a build up of moisture on your windows and window sills? If you do, an HRV is recommended to exhaust excessively humid air. In today's tightly built homes moisture can build up. Each average person puts about 6 pounds of water into their home each day while breathing, cooking, and cleaning. Excessive moisture build-up on windows and sills shows that your current system isn't working well enough.

Do you want to provide just the amount of ventilation you need for comfort and safety while avoiding expensive and uncomfortably excessive ventilation. You can achieve these goals by following two steps recommended by The American Lung Association recommendations:

Use a heat recovery ventilator to provide all the fresh clean air you need while removing stale and polluted air from indoors.

Seal air leaks in the building shell to block entry of dust, insects and cold drafts.

Q.  Is moisture a problem?

A.  It can be a problem both for you and for your home.
Excess moisture can contribute to health problems associated with mold allergies, and microorganisms. Excess moisture can seep into the walls and woodwork, causing dry rot and other structural problems. Other bad effects of excess humidity include peeling wallpaper, discoloration of paint, musty odors and condensation in walls and on windows. This can result in structural damage.

Q.  I've noticed I tire easily and don't have any energy. Can this be related to the air I'm breathing in my home?

A.  Yes, it can.

Trapped inside, air cannot renew itself and becomes stale. Today's homes are built so tightly that carbon dioxide (C02) can build up in them. And what is the chief source of carbon dioxide? It's people — you and your family. Each time you breathe, you exhale carbon dioxide. And in a tightly built home, carbon dioxide can build up to an unhealthy level. Add more people and C02 can build up fast. Symptoms of excess C02 may include nagging headaches, general lethargy, and grogginess.

If you suffer from frequent colds or allergy symptoms, an HRV can help relieve these problems. In newly constructed homes, pollutants can be released into the air by household chemicals, carpeting and construction materials. These can often be the cause of headaches, asthma, allergic reactions to dust, and the common cold that lingers on in the winter months. An HRV brings in a steady supply of fresh filtered air so that you can breathe easy and safely.

Q.  Can an HRV reduce entry of radon and water from the soil into my home?

A.  Yes. The amount of stale air removed and the amount of fresh air brought in by an HRV are equal so a partial vacuum is not created in your home. Ordinary exhaust-only systems create a partial vacuum that pulls radon and water vapor in through pores and cracks in the basement. Radon causes lung cancer. Condensation of water vapor in cool basements contributes to growth of molds and other microbes that emit odors and dangerous volatile organic compounds.

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