CHOOSING THE RIGHT WATER HEATER

Bigger is not necessarily better when it comes to choosing the size of a water heater. If you install a tank that’s too small, you’ll run out of hot water before finishing the shower. And if you get a tank that’s too big, you’re wasting money on heating water they won’t use.  By following a few guidelines, you can find the perfect size water heater:

Determine the home’s FHR, or first hour rating. That’s the measure of how much hot water the heater will deliver during a busy hour, such as first thing in the morning. The FHR is always on the heater’s yellow EnergyGuide label, but if you want to double-check it yourself, use the following formula and a four-bedroom house as an example:

Step 1: Allot 12 gallons of hot water per person in the household.

Step 2: Figure the home’s maximum occupancy as the number of bedrooms plus 1. In this case, we have 4 bedrooms, so we add 1 and get 5. Now multiply this amount times the 12-gallon allotment and you end up with an FHR of 60. That’s the minimum FHR that this home should needs on its water heater.

Consider the energy factor, or EF. The higher the EF, the more efficient the tank is. In our example, you’d want to find the highest EF rating available for a tank with an FHR of 60.

Until the creation of the FHR by the National Appliance Energy Conservation Act, contractors had to use complicated tables and building codes or the minimum standards set by the Department of Housing and Urban Development. But now it’s easy to determine exactly the best size to have enough hot water as cost-efficiently as possible.

DISHWASHER LEAK

Pictured here is a photo of a kitchen where the dishwasher was removed because of a slow leak.  The insurance company told the home owner to not worry about pulling the unit out, and just have the plumbing fixed.  We urged the customer to remove the dishwasher, and this is what we found.

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SURFACE SAMPLING OVERVIEW

There are other simple sampling methods that may be used to supplement volumetric air sampling. Surface samples are taken by tape lift imprint, by swabbing the suspect surface with a culturette swab, or by submitting a bulk sample of the suspect surface. We typically recommend that a direct microscopic examination be performed on surface samples. While culturing a surface sample may help resolve a specific identification problem, used alone such a culture may result in an inaccurate characterization of the surface sampled. A direct microscopic examination of a surface shows exactly what is there, without being affected by an organism’s ability to compete and grow on sampling media.

The primary purpose of a direct microscopic examination of a surface is to determine whether or not mold is growing on the surface sampled, and if so, what kinds of molds are present. Secondarily, most surfaces collect a mix of spores which are normally present in the environment. At times it is possible to note a skewing of the normal distribution of spore types, and also to note “marker” genera which may indicate indoor mold growth.

In addition, when mold growth is present indoors, many more spores of a particular type will be found trapped on surfaces. These spores may be in forms which indicate recent spore release (close proximity), such as spores in chains or clumps. Marker genera are those spore types which are present normally in very small numbers, but which multiply indoors when conditions are favorable for growth. These would include cellulose digestors such asChaetomium, Stachybotrys, and Torula. While a singleStachybotrys spore is occasionally seen as part of the normal outdoor flora, finding 5 or 6 of these spores on a single scotch tape slide of a duct surface is an indicator thatStachybotrys may be growing indoors.

Pros

A direct microscopic examination of a surface shows exactly what is there, without any skewing by laboratory procedures. Surface sampling is inexpensive and (for a direct examination) may be analyzed immediately. Surface sampling may also reveal indoor reservoirs of spores which have not yet become airborne.

Cons

The presence of biological materials on a particular surface is not a direct indication of what may be in the air. Health problems related to indoor microbial growth are generally caused by the inhalation of substantial numbers of airborne spores, sometimes over a substantial period of time (exceptions being, for example, situations involving small children or immuno-compromised individuals).

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DANGERS OF OZONE MACHINES – PART 1

Ozone generators intentionally produce the toxic gas ozone and are sold as air cleaners for commercial and residential applications. Specifically, they are advertised to deodorize, disinfect, kill or remove dangerous or irritating airborne particles in indoor environments.  Ozone is the principal element of the ozone layer, which traps the sun’s heat and is essential to life on Earth. Unlike breathable, stable oxygen molecules, which are composed of two oxygen atoms, ozone is composed of three. The third oxygen atom in ozone can easily detach from the ozone molecule and reattach to other substances, altering their chemistry. Ozone generators produce the gas in large enough quantities that unstable organic compounds will react with the gas and, supposedly, be altered so that they will no longer be irritating or dangerous.

• Note that ozone can dull the olfactory sense, a fact that has led many experts to believe that ozone’s deodorizing abilities are at least partially due to an altered odor perception, rather than any change in the environment.

Health Considerations

Unfortunately, the same chemical properties that allow ozone to alter organic material in household air also give it the ability to react with organic material inside the human body. Even low levels of ozone exposure can cause the following conditions:

• coughing, chest pain, shortness of breath, wheezing, and throat irritation;
• worsened chronic respiratory diseases, such as asthma;
• increased risk of developing bronchitis or pneumonia; and
• compromised ability of the body to fight respiratory infections.

People’s susceptibility to ozone varies widely. An ozone generator should never be operated in occupied spaces, and the area should be adequately vented before people or animals are allowed to re-enter.

According to a report produced by the EPA, ozone generators are ineffective at reducing levels of formaldehyde and carbon monoxide, despite claims by manufacturers. Also, from the toxins with which ozone does react, there is a potential for the creation of new, potentially more dangerous toxins. For example, ozone mixed with chemicals from new carpet can create aldehydes, which can irritate the lungs. Other reactions may create formic acid, another irritant. The potential for chemical reactions in the average house is difficult to predict.

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NON-CULTURABLE AIR SAMPLING

Overview

Non-culturable spore trap samplers draw measured volumes of air through the sampling device for a specified length of time. The collection surface is a coated glass slide. Particles in the air (spores, dust, etc.) impact onto the sticky surface and are “trapped” for later analysis.

A general philosophy regarding the interpretation of biological air samples is formed primarily by two guiding principles. First, an effective interpretation is based on the comparison of indoor and outdoor samples. There are currently no guidelines or regulations to indicate “safe” or “normal” spore levels, however, we typically expect indoor counts to be 30 to 80 percent of outdoor spore counts, with the same general distribution of spore types present. And second, variation is an inherent part of biological air sampling. The presence or absence of a few genera in small numbers should not be considered abnormal.

Pros

Spore trap samplers are capable of capturing all spores and particulate matter in the air. Consequently, it is possible to accurately characterize problem environments where spores are present but either are no longer viable or are species that do not culture well (i.e. Stachybotrys). These are two situations where culturable sampling techniques, if used alone, may miss a potential indoor air quality problem.

Cons

While many mold spores have a unique morphology and are identifiable by direct microscopic examination, others do not and are more difficult to identify. These latter types must be counted in broader spore groups.

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WHEN THE POWER GOES OUT

With powerful thunderstorms becoming more frequent, here’s a list of things to do when the power goes out

• UNLESS there is an emergency, do not call 9-1-1. That number should ONLY be used if there is an emergency, or if someone is injured or in danger.
• If there are downed power lines in your neighborhood, do not go near them. Call 9-1-1 first to report the emergency. Then call your electricity company. Check to make sure that no children or animals go near the wires – they could still be electrictrified and are lethal.
• A rolling blackout during warm weather will most likely occur during the evening peak hours of 4 p.m. to 7 p.m. Because it may be dark in rooms with no lights, keep flashlights handy. To avoid a power surge when the electricity returns, turn off computers, TVs, stereos and other unnecessary electronic equipment at the power strip.
• Drink plenty of water. You will perspire and lose water, so stay hydrated.
• Dress to stay cool – wear layers that can be removed if you get hot.
• Avoid opening your refrigerator and freezer as much as possible. Food inside should stay cold for hours if the door is left closed.
• If you’re hot, take a cool shower to reduce your body temperature.If you have a pool or a neighbor with a pool, it’s s good time to take a dip. The cooler water will bring your body temperature down and help you to stay cool.
• Check on your elderly neighbors or those who may have medical conditions or use medical machinery that operates on electricity. Make sure they are dressed appropriately and are staying cool.
• Drive carefully. Remember that traffic signals may be out in a rolling blackout. Consider each intersection to be a four-way stop and drive defensively.

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