Any degree turns in the vent reduce this foot number by 5 feet, since these turns restrict airflow. Duct termination. Exhaust ducts shall terminate not less than 3 feet in any direction from openings into buildings. Exhaust duct terminations shall be equipped with a backdraft damper.
Screens shall not be installed at the duct termination. Our inspectors will see many dryer vents terminate in crawlspaces or attics where they deposit moisture, which can encourage the growth of mold, wood decay, or other material problems. Sometimes they will terminate just beneath attic ventilators. This is a defective installation.
A typical pound load of laundry can weigh as much as pounds when first removed from a washer. The extra 8-pounds is water. That recovered moisture is held as humidity in the warm air produced by the dryer and is normally expelled to the outdoors through the dryer's vent.
If this air can not be adequately vented, poor drying will result. If restricted, this moisture can also condense into pools of water inside the dryer venting, possibly leaking out. Moisture accumulation inside the dryer ducting is often a sign of inadequate venting which should be looked into. Heat The heat is another important function of a dryer. Many current dryer models have 'one time', non-resettable, thermal fuse or safety.
These safety devices will open should the dryer overheat due to improperly installed venting or it becomes restricted. Once this happens, the dryer will no longer heat at all and will require the failed part to be replaced to correct the condition.
On some dryer designs usually electric failure of a thermal fuse will totally stop dryer operation altogether. On older models without one of these thermal safeties, poor venting can cause the dryer to cycle on its safety thermostat instead of its temperature control thermostat.
This can cause overheating or under-heating, contributing to poor drying and possibly retarding the movement of the timer on automatic cycles. Without proper air flow through the dryer the thermostats may not cycle the heater to maintain proper temperature.
The heat created by the heater has to go somewhere, that is usually to the cabinet. This is a sign of a very dangerous condition! Operation of the appliance should be discontinued and possibly even unplugged! Vent Types and Length The maximum length a dryer vent can be before problems arise or are noticed varies greatly between brands and models as highlighted below. For every degree bend, you have to deduct 2. For every degree bend, deduct 5 feet. Clothes dryers need to have good airflow to work properly.
When a vent line is too long, dryer exhaust ends up being stuck inside your vent line. The house is on a basement if that makes a difference. Any thoughts? My electric dryer vents to my front porch, and it has never been a problem. There's a little lint from time, but if you sweep your porch regularly, it is not a problem.
And the birds and squirrel appreciate it when they're building their nests. Int'l Association of Certified Home Inspectors The maximum length of a clothes dryer exhaust duct shall not exceed 25 feet 7, mm from the dryer location to the wall or roof termination. The maximum length of the duct shall be reduced 2.
Booster fans can be used with long length runs. More info. I had no idea about 25ft rule - however in that article you linked it also had a " Dryer Venting Comparison Chart" with the manufacturer recommended length and most of them were well over 25ft - what's the difference? Fabric softener in washer or dryer? Is my dryer vent a fire hazard?? The International Residential Code is using the lowest common length because nobody really knows which dryer will be installed, and the duct is usually buried in the walls and floors, never to be seen again.
The comparison chart is just a cross section of some of the dryers, and also includes flexible duct which is only allowed by the IRC in a short section to connect the dryer. The comparison chart also points out a difference between a type A and type B vent hood.
The IRC does not make the distinction, so it has gone by the lower number of the two in the ridgid metal category.
In , the IRC changed its stance a bit and now allows 35' as the maximum length since it appears more compatible with the manufacture specs, and the outside hood could be changed if need be. If the IRC is the applicable code, the allowed termination location would be determined by the dryer manufacturer's installation instructions. If there are none, it must be at least 3ft in any direction from an opening into the building. If you are in a cold climate there will be a condensation plume which might alarm the neighbors the first time they see it so a low location screened from view might be best and not on an entrance porch.
There's not enough information for us to help you with that. Once we took the vent hose out to the garbage can, the horrible smell was gone. A little critter had climbed up the ivy on the side of our house and into the vent opening This was a bad evening for us, and we were very, very glad that our dryer vents directly outside. Imagine how much worse this would've been if the hose had stretched across another room.
Realistically, we would've had to put up with the smell 'til a repair man could arrive -- and, of course, the smell popped up around dinner on a weekend. They have a electric dryer that ventless that might be a option,I think bosch,Miele,and whirlpool offer them. Ours is at the front of the house. No issues with that as its not visible as there is a flower bed right there. Might be a bigger deal if it vents on a porch.
There tends to be some lint in the area at times and the vent can get quite hot. It would not be wise to trap the moisture under a porch roof, even if it were far enough from an opening to satisfy code. Venting a dryer through a roof is another "fat house" solution that is a poor choice. Mainly because almost no one does the recommended duct cleaning. Lint is heavier than moist air, and can form an impenetrable mass filling the duct, and creating a very dangerous fire risk.
The best solution is to properly site the laundry room on an exterior wall where it can be vented directly out. If the IRC is the applicable code, the allowed termination location would be determined by M Air shall not be exhausted into an attic, soffit, ridge vent or crawl space. Which M Neither the dryer manufacturer's installation instructions, nor M Thanks everyone for all the info - so what's the lesser of two evils - run a ft line to the back of the house or a ft line to the front of the house that dumps onto a covered porch?
If the metal duct will be exposed in the basement, has a booster fan located near the end of the run and has few turns it should be fine.
A good fan will have an indicator at the dryer showing if it is operating properly and will shut down if the temperature rises too high. If the front wall under the porch roof has good exposure from the sides and the termination is near one side and not near openings, seating areas or obstacles like plants are more than 12" away, that can probably work too. Perhaps the duct can be extended vertically so the termination is above the porch roof.
IMO you are likely to have prevented us from suggesting the best solution by not posting the plans and elevations of the house. LINK to Fantech. Obviously don't vent it out of the front for aesthetics, but that run is waaaay too long for the back.
Vent it out the side wall This allows for it to be functional but still look fine. Look at the heartland type wall vent for positive seal on the dryer vent which is also easily cleanable for the lint.
Have you checked into the condensing dryers, no vent required? We are entertaining it. Condensing dryers are great as long as you don't mind waiting hours for your clothes to dry and I'm talking about small loads.
We don't even bother doing things like sheets and towels in it anymore because that could take all day to dry. We have an Asko condensing dryer in our apartment and I will never get another condensing dryer again. I have to run the dryer 2 and 3x for anything to dry thoroughly. Add to that if you are planning on having the dryer in a closet and not in a room, it will mean keeping the doors to the closet open the whole time the dryer is going. Otherwise the dryer won't get enough air to work properly.
Or get a louvre closet door, or have an intake grille on the door equal or greater than 50 sq inches. Condensing clothes dryers remove water from the dryer air by condensing it into a liquid so there is no ducted exhaust and no makeup air needed.
If ventilation air is required by the manufacturer, it is because some units use small blowers to circulate air across a heat-exchanger inside the dryer or draw in room air to cool the interior air and condense the water. Although there is no requirement to provide an exhaust, fresh air ventilation must be available to a condensing dryer so usually a closet door cannot be solid or it must be open when the unit is operating. These units don't really work in small spaces unless there is mechanical ventilation provided.
However, it might be easier to supply outside air to the OP's laundry room than to provide a dryer exhaust.
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