Tag Archives: exhaust venting

High Humidity In Bathrooms

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Significance Of Bathroom Ventilation

Bathroom fans are essential in today’s designs of air tight and energy-efficient homes and assist in the prevention of humidity issues.   Proper ventilation is important  when it comes to the  overall health of the homeowner and assist in the structural integrity if the home.

Presence of health hazards

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Image from: Black-mold.com

The biggest problem with bathrooms is the high humidity level. Humidity is simply the amount of water vapor in the air. Warm air holds more humidity than cold air. These may be adversely affected in the bathroom by the presence of microbial hazards that grow in damp and dark areas, such as poorly designed bathrooms.

Bathroom Exhaust Fans

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For bigger bathrooms it is recommended to have a bathroom fan, which is an exhaust fan that pulls excess moisture away from the  interior to be vented outside the building. In this way, the humidity and moisture inside the bathroom reduce the risk of growth of mold. However, be sure to check that the bathroom fan is strong enough to pull moisture outside the bathroom, and a simple way to test this is by holding up a tissue to the fan. If the tissue falls down, the fan is not strong enough.

Structural Damage

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Moisture vapor can peel wallpaper or paint off the surfaces and encourage the growth of mildew and mold. Moist air can condense inside the wall cavity, where it can cause rot, mold and serious structural damage to wall studs, sheathing, and ceiling and floor joists above and around the bathroom.

 Timer Switches

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Ventilate and control all fans with timer switches.  In my professional opinion,  the best  and most cost-effective way to remove humid air from showering is to replace your light / fan switch with an automatic timer switch.  It’s designed so that the fan goes on when you set the timer, then shuts off when the time runs out.

Using a timer switch allows you to remove humidity for up to 30  minutes  or more depending on the model after you leave the room, without the worry of forgetting to turn the fan off.

Don’t Have a bathroom fan? Get one installed by Don Of All Trades Professional Home Maintenance Services

“Click on our flyer to find out more about our services!”

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For more information or to post a comment : please visit our links below:

Website – http://www.donofalltrades.ca/

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White Vinyl Duct Hose Dryer Venting: Fire Hazard

I felt I had to write and inform people about fire hazards with respect to dryers. The photo below is one I took of a project I had been hired to work on and this is the condition of the dryer venting hose I brought to my clients attention. I want to inform home owners that this is a potential fire hazard and everyone should take this seriously.

A clothes dryer vent system needs to be installed properly and maintained on a regular basis to keep the dryer operating efficiently. Improperly installed and maintained dryer vents can result in clogged dryer vents that can cause your dryer to overheat and create the potential for a serious fire.

 

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In order for  clothes dryers to function properly, they  must be vented correctly. Regardless  if you are diligent about checking the lint filter after every load, lint can still build up in your vent hose. Are you using the safest type of vent hose?

All local building codes now require metal ducting for clothes dryers. Ideally, you should use rigid aluminum tubing pieces between the dryer and the outside vent. This type of tubing does the best job of resisting the collection of lint in the duct. Flexible aluminum ducting is available, however, it is more prone to collecting lint inside.

If you still have white vinyl duct hose, it should be replaced immediately. It is flammable and if ignited by the dryer it will burn and cause a house fire. Aluminum vent hose is inexpensive and well worth your time and trouble to install. It may save a life.

So What Kind of Dryer Exhaust Venting Is Considered Acceptable?

I have attached a link provided by a company called The Inspection Consultant to help you find the best answer to this question including other valuable information  regarding codes and guidelines.

http://www.gtahomeinspector.com/1Residential/Dryer-fire-toronto-mississauga-oakville-the-inspection-home-consultant.html

The recommendations outlined below reflect International Residential Code (IRC) SECTION M1502 CLOTHES DRYER EXHAUST guidelines:

M1502.5 Duct construction.
Exhaust ducts shall be constructed of minimum 0.016-inch-thick (0.4 mm) rigid metal ducts, having smooth interior surfaces, with joints running in the direction of air flow. Exhaust ducts shall not be connected with sheet-metal screws or fastening means which extend into the duct.

This means that the flexible, ribbed vents used in the past should no longer be used. They should be noted as a potential fire hazard if observed during an inspection.
M1502.6 Duct length.
The maximum length of a clothes dryer exhaust duct shall not exceed 25 feet (7,620 mm) from the dryer location to the wall or roof termination. The maximum length of the duct shall be reduced 2.5 feet (762 mm) for each 45-degree (0.8 rad) bend, and 5 feet (1,524 mm) for each 90-degree (1.6 rad) bend. The maximum length of the exhaust duct does not include the transition duct.
This means that vents should also be as straight as possible and cannot be longer than 25 feet. Any 90-degree turns in the vent reduce this 25-foot number by 5 feet, since these turns restrict airflow.

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