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Archive for February, 2012

Indoor Air Pollution

February 18, 2012 By: admin Category: HVAC Equipment, Indoor Air Quality No Comments →

There are two main types of air pollution;
1. Particulates (air pollutants that have mass) dust, dander, pollen and cigarette smoke.
2. Volatile Organic Compoundes (VOC’s) which are gases from chemicals that are released into the air by various household materials and liquiteds.

Some sources can be included but not limited too are:
1. Carpets – may emit VOC’s, trap dust, home for microbial organisms
2. Cigarette Smoke – Contains 40 know carcinogens
3. Dry-Cleaned Clothing – may emit chemical used in the dry-cleaning process
4. Furniture – pressed wood may emit formaldehyde
5. Household Dust – most dust is too small to see
6. Mattresses & Pillows – homes for dust mites, trap dust
7. Pets – shed dander, carry bacteria, odors
8. Stuffed Toys – trap dust, may emit VOC’s
9. Air Ducts – can contain molds
10. Wall Paper – mold and mildew can form between paper and walls
11. Air Freshners – may emit VOC’s
12. Household Cleaners – may emit VOC’s
13. Personal Care Products – may emit VOC’s
14. Toilets – source of odors and mold
15. Showers & Tubs – mold and mildew
16. Cabinets – pressed wood may emit formaldehyde
17. Plants – source of pollen and dust, home for microbial organisms
18. Upholstery & Drapes – trap dust and odors
19. Wood Stoves / Fireplaces – product fly ash and smoke
20. Radon Daughters – The radioactive decay products of naturally occuring radon gas that can become attached to airbore dust particles.

The Technical Side To Cleaning A Dryer Vent

February 15, 2012 By: admin Category: Dryer Ducts, HVAC Equipment No Comments →

A magnehelic pressure gauge is a device, similar to a manometer, that is used to measure positive, negative, and differential pressures.

Just as a magnehelic gauge can give your HVAC technician a wealth of information about the operation of your furnace and duct system, it can also provide your duct cleaning technician with valuable information about your dryer exhaust vent too.

The magnehelic gauge can be used to quantify how blocked (or inefficient) a dryer is operating prior to cleaning the dryer vent. After cleaning, the gauge will tell you exactly how much more efficiently the dryer is venting. Technically speaking, dryer manufacturers say to have the dryer vent cleaned if the back pressure readings are greater than 0.6 – 0.75 inches of water column (wci), as indicated on the gauge itself.

The magnehelic gauge measures duct static pressure, which is the pressure the blower produces in the exhaust conduit. In this industry, back pressure is a result of one or more of these conditions: long duct runs, excessive elbows, squished transition hoses, lint buildup, bird nests, rodent nests, and termination hoods that are blocked or feature an inefficient design.

As you can see, cleaning a dryer exhaust duct can be narrowed down to a pretty exact science. Contact City Duct Cleaning today to schedule your dryer exhaust vent cleaning/inspection.

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