Sabtu, 27 Juli 2013

What's the difference between vented and ventless gas logs?

carbon monoxide detectors required in california on La Mesa, CA - Official Website - Animal Control
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I have a wood-burning fireplace and would like to have gas logs installed. Any advice on whether vented or ventless gas logs are better in terms of price, upkeep, look, etc?


Answer
There are reasons to pick both, it just depends on which are important to you.

Positive Features of Vented Gas Logs:

Extremely realistic flame pattern that looks like a wood fire.
Flame is much taller than vent-free logs
Flame dances and wraps around logs like real wood.
Does not require a Carbon Monoxide (CO) detector
Since the damper is open, most of the smell will go up the chimney

Negative Features of Vented Gas Logs:

Less heat than vent-free logs (probably won't heat your room)
Uses slightly more gas than vent-free logs

Positive Features of Vent-Free Gas Logs:

Much better heat output than vented gas logs
Less pollution
Slightly less gas consumption

Negative Features of Vent-Frees Gas Logs:

Since the byproduct of burning gas cleanly is water, vent-free logs will introduce excess moisture into your home which can result in mold or mildew.
You must be careful not to burn your vent-free logs for extended periods of time with windows closed, otherwise they will deplete the oxygen in your home.
If you burn your vent-free logs for more than an hour or so, you must crack open a window to allow air into your home to replace the oxygen burned by the vent-free gas logs. This will introduce cold air into the room and offset some of the heating benefits that vent-free logs claim to have.
Vent-free gas logs produce an odor that many people equate to the smell of burning kerosene. So if you have a sensitive nose, you may not be able to handle the smell and will be greatly dissatisfied with vent-free logs. On the other hand, we've heard some people who like the smell because it reminds them of their childhood days at Grandma's house.
Vent-free logs are not legal in California as well as some cities and municipalities. Please check your local regulations. Please note that it is not illegal to use Vent-free log sets if they are used with the vent open.
Vent-free gas logs are required to have an ODS (oxygen depletion system) as well as a Carbon Monoxide (CO) detector.
The flame pattern with vent-free logs pails in comparison to vented logs. Because the gas must burn cleanly, the flame height is very low and most of it is blue. Also, you will find that the flame does not dance around like a real wood fire and very little of the flame actually touches the logs. The reason for this is that when the flame touches the logs, it gets cooled off and does not burn cleanly and starts to produce soot and exhaust gases.

How can you tell if someone is smoking ?

Q. How do you know if someone is smoking ? Is their anything in their appearance where you might be able to guess ? Or any noticable symptoms ? Or is their a way to catch them out ?


Answer
You can ask the suspected smoker directly, "do you smoke". But once they say they don't smoke and they lie about it, they will never volunteer that information,"

Look for Nicotine stains on fingers, Yellowish stains on teeth, (can also be coffee tea etc.). Withdrawl symptoms including irritation, anger, depression, headaches, concentration problems, fatigue, constipation, restlessness, insomnia, dizziness, anxiety. The smokers clothing, room, and car will smell like cigarettes or a dirty ashtray.

Most "addicted" smokers will require a cigarette after their body has been deprived of nicotine (after sleeping). Watch behavior in the morning see if there is signs of nicotine withdrawls. If the smoker is trying to conceal the fact that they are smoking there will be a need to "be alone" during this time.

I don't know if this will help but, I drive to Southern California 3 times a year, and I've noticed that I usually go through an entire pack of cigarettes to complete a six hour drive. If there is a trip in your near future and the suspected smoker is going, (this will depend on the level of addiction in the suspected smoker) you should see some signs of nicotine withdrawls, unless the suspected smoker is wearing a nicotine patch or using some sort of nicotine replacement device (gum or lozenges).

If you're unable to catch 'em in the act there will also be noticeable changes to behavior after the smoker has satisfied their need for nicotine. Most smokers feed the nicotine addiction to help themselves relax or calm down when stressed. smoking also stimulates and increases concentration.

There is also information about a device available to hospitals for detecting carbon monoxide in the blood: http://www.reuters.com/article/scienceNews/idUSN2220914720071023

There are also "STEALTH" smoking detectors available that have been put to use in schools which detect the ultraviolet light present in the flame of a cigarette, lighter, or match: http://www.catchasmoker.com/

and finally...

A short questionnaire coupled with a urine test in the pediatrician's office can spot teen smokers: http://preventdisease.com/news/articles/doctors_can_catch_teen_smokers.shtml




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