On the other side of the wall in the photo shown above a periscope type connection adapted the dryer outlet to the through-wall vent. A "banjo-type" or "periscope type" metal dryer vent connector makes the 90 degree bend connection at the back of the clothes dryer where space is limited. Our photo below illustrates a typical clothes dryer periscope vent that permits the back of the dryer to be placed closer to the wall than would be possible with round dryer vent ducting.
Periscope dryer vents are usually telescoping in length and sold in ranges such as " tall, or longer. The vent provides better air flow than a partly-squashed flexible duct dryer vent, and it resists crushing, therefore it's safer. Keep the vent duct sections as short, straight, and directly routed to the building exterior as you possibly can. Our metal dryer vent installation shown just below has the right idea, though not a very neat installation and not properly sloped.
Industry standards recommend that the maximum "concealed" rigid metal ducted clothes dryer vent length be no more than 25 feet IRC; some codes permit feet. That's because a normal 4-inch degree metal dryer vent elbow bends 90 degrees in a 4-inch radius while the Dryer-Ell product makes its bend over a more gradual inch radius. Section M However the installation instructions and recommendations from the individual clothes dryer manufacturer are the final authority on how the dryer should be installed.
Some dryer manufacturers permit installations with dryer exhaust venting of much greater lengths [though perhaps combined with a requirement to avoid use of 90 degree turns in the duct system]. Note: Fantech notes that. The maximum length for dryer exhaust duct cannot exceed 35 feet from the dryer location to the wall or roof termination.
Slope the clothes dryer vent duct downwards towards its building exit - this will avoid condensation accumulating inside the ductwork and dripping back into the building ceilings or insulation.
It's fine for the dryer vent to rise vertically to enter the building ceiling, but within the ceiling the vent should slope downwards towards its exit point at the building exterior wall. Provide one or more dryer vent duct inspection access points at which you can disconnect and open the dryer duct system for inspection and cleaning.
This is especially critical in long dryer runs through ceilings and walls where the risk of blockage and fire would be increased. There should be no section of dryer exhaust vent ducting that is inaccessible for inspection and cleaning. Insulation around the dryer vent is not normally necessary if you install straight, well-supported metal ductwork sloping to its exit point at the building wall. But if ductwork must be routed up and down through space such as an attic, air conditioned interior, or dryer vents routed through a cool crawl space where otherwise the duct will be exposed to cold air the result will be a significant level of condensation within the dryer vent duct system.
For such areas and routing you should consider using insulated solid metal ducting or insulated flex duct to avoid condensation buildup, corrosion or leaks into the structure. Install a secure, self-closing screened exhaust vent cover - the vent hood, outside the building at the end of the clothes dryer vent line in order to prevent rodents or birds from entering the ductwork.
Every manufacturer's clothes dryer vent fan installation guide that we reviewed emphasized: make sure that the vent ducting carries moist air all the way outside of the building. The preferred or most-recommended dryer vent routing is shown above, adapted from Whirlpool dryer vent instructions cited in detail below.
Our sketches shown here, adapted from Whirlpool clothes dryer installation recommendations cited at the end of this article, show typical clothes dryer vent routing options includint a special provision for routing the dryer exhaust outside through a crawl space below a mobile home. In some areas where winter air is very dry homeowners may choose to temporarily spill dryer vent air directly into the building interior in order to try to raise the indoor humidity level.
This approach violates manufacturer instructions and is unsafe. Do not spill the laundry vent air directly into the building attic or roof cavity, basement, crawl space, or other hidden building interior areas. Doing so will lead to moisture condensation on building surfaces, wet, damaged, moldy building insulation, wet building framing members, wall, floor or roof sheathing. In these locations spilling laundry dryer vent moisture will certainly encourage mold growth. And Cranor points out that spilling dryer vent products into the building can be a dangerous carbon monoxide hazard as well, at least for gas-powered clothes dryers.
Even if the dryer exhaust vent does extend to the outdoors, an improperly sloped, damaged, or disconnected dryer vent can leak moisture, lint, dust, and even dangerous carbon monoxide CO into the building. Leak stains in building ceilings may be traced to condensate leakage from an overhead clothes dryer vent.
Complete details about clothes dryer exhaust vent installation are provided below in this article. Clothes dryer exhaust vents should be directed to the building exterior.
Do not vent the clothes dryer indoors nor into an attic, crawl space, or other enclosed area. Vent the dryer duct to outside : Our photo above shows a dryer vent spilling directly below the building first floor into a soaking wet crawl space. Along with trash, debris, and other water entry sources, this crawl space was a moldy mess that had led to wet building insulation, mold contamination, and damage to the structure.
Do not vent clothes dryers directly into the attic space : you're only putting more moisture into an area where it is already going to be a problem, inviting mold growth on wood surfaces and hidden mold growth in building insulation.
Avoid through-roof dryer vent exits : Our photo left shows a typical attempt at venting a upper floor clothes dryer through the attic and into a ridge vent - this direction of vent exit may seem convenient but we don't like it much. In the photo left the droopy flex-duct will certainly invite clothes dryer moisture to condense and run back to the home's ceiling rather than exiting at the ridge.
The through-roof vent approach gives us another roof penetration, a possible leak spot, and it almost assures that condensing moisture will drip down the vent duct and into the building ceiling. Additional roof top dryer vent photos below illustrate a vent that became lint clogged and that was snow-covered and blocked in winter.
Our second clothes dryer vent exhaust mistake is shown above: the installer hung the vent opening at the crawl space vent screen. Not only did lint clog the crawl space vent, but most of the damp dryer exhaust air soon was being spilled into the crawl space ceiling.
Above: a clothes dryer exhaust vent installed in a mobile home can be vented down through the crawl space and outside through the skirting wall, but must never be vented to terminate right in the crawl space. Exhaust vent must be securely fastened to a noncombustible portion of mobile home and must not terminate beneath the mobile home. Terminate exhaust vent outside. We include a table of the tempeatures that occur inside of clothes dryers at different places in the equipment and in its venting system and we describe unsafe dryer operating temperatures.
Clinton, I don' t understand the question. Or, follow the duct length recommendations specified by the manufacturer IRC M, see Compliance tab. The duct should be secured in place and supported at foot intervals. Avoid sags in the duct. See the IRC for calculating duct length, taking into account duct diameter and bends in the duct.
The transition duct the visible piece of duct connecting the dryer to the wall can be up to 8 feet and should be listed in accordance with UL A; there are some semi-rigid metal transition duct products that are UL listed.
The ducts should be joined with clamps or foil tape. Screws or similar fasteners that can protrude into the inside of the duct and catch lint must not be used.
The exhaust duct should terminate outside the building at least 3 feet from any building opening and at least 10 feet from an AC or heat pump condenser. The duct termination should be fitted with a closeable gravity or automatic damper. A louvered damper is more effective than a single hinged door.
No screen should be installed in the duct terminus IRC M When installing the interior duct terminus in the laundry area inside the home, consider using a telescoping rigid metal transition duct or installing an inset box in the wall where the dryer will be located to allow space in the wall cavity for the connecting duct to come up from the floor to the port on the back of the dryer.
This inset allows the connecting duct to be straight and not be crushed or looped behind the dryer in ways that severely restrict air flow and can cause a fire hazard from trapped lint.
There are several commercially available products or this inset can be constructed on site with 2x4 blocking, drywall, tape and mud to air seal the seams Bailes Homeowner education is important for the long-term safe operation of a clothes dryer. Verify with a visual inspection that the clothes dryer vents directly to the outdoors or is a ventless dryer equipped with a condensate drain.
Compliance The Compliance tab contains both program and code information. Code language is excerpted and summarized below. For exact code language, refer to the applicable code, which may require purchase from the publisher.
While we continually update our database, links may have changed since posting. Please contact our webmaster if you find broken links. Exception: This requirement does not apply to clothes dryer vents. Conventional clothes dryers shall be vented to the outdoors. M Clothes Dryer Exhaust. Follow manufacturer's instruction and the requirements of Section M which states that dryer exhaust systems to be independent of all other systems and convey the moisture to the outdoors, unless listed and labeled condensing ductless dryers are used.
M also specifies dryer duct materials metal with smooth interior, not plastic , dimensions min. See M for more requirements. Retrofit: , , , , and IRC. Section R Additions, alterations, renovations, or repairs shall conform to the provisions of this code, without requiring the unaltered portions of the existing building to comply with the requirements of this code, unless otherwise stated.
See code for additional requirements and exceptions. Appendix J regulates the repair, renovation, alteration, and reconstruction of existing buildings and is intended to encourage their continued safe use. For ducted noncondensing clothes dryers, inspect and repair the dryer exhaust duct to improve safety and performance.
See the U. Poorly performing clothes dryers are a common source of service calls to appliance repair shops. A clothes dryer pulls in air from the room in which it is located, heats that air, and then exhausts it to the outdoors via an exhaust duct. The dryer relies on good airflow to dry the clothes, water vapor from the drying clothes in pushed out the exhaust duct, often carrying a considerable amount of lint with it.
Short, straight, horizontal, smooth metal surfaced exhaust ducts provide the best performance. Excessive length, upward angles, kinks, narrow ducts or transitions, and nonsmooth surfaces can all increase resistance in the duct, reducing air flow and contributing to lint build up which overtime can decrease or completely block the airflow. In response some clothes dryers will cease to work resulting in wet clothes. Some clothes dryers will heat up in an attempt to dry the clothes, resulting in very hot clothing and in the possibility of a fire from burning clothing or lint.
The clothes dryer exhaust duct should be inspected in response to clothes dryer complaints; it should also be inspected and cleaned periodically. Inspections often reveal crushed, kinked, or clogged hoses. Detach the clothes dryer vent exhaust vent and inspect both the transition hose from the dryer to the wall or floor and the exhaust duct from the interior wall or floor to the exterior wall. There are cleaning kits available to clean the exhaust duct or hire a professional. Vacuum out the transition hose from the dryer to the wall.
Replace damaged ducts. Replace ducts made of vinyl, nylon, or foil. If used, they will void the warranty of most dryers. Select personalised content. Create a personalised content profile. Measure ad performance. Select basic ads.
Create a personalised ads profile. Select personalised ads. Apply market research to generate audience insights. Measure content performance. Develop and improve products. List of Partners vendors. Tip The best way to ensure a duct is safe for your installation is to look for a product that is listed, or certified, by a national testing laboratory, such as UL Underwriters Laboratories.
Aluminum Foil Duct. Semi-Rigid Metal Duct. Slim Duct Slim duct, sometimes called periscope duct or known by the brands Tite-Fit or Skinny Duct, is a telescoping rigid aluminum duct designed for transition ducting in tight spaces.
Rigid Metal Duct. Warning Always use metal duct tape to secure the joints; don't use screws, because they catch lint. Continue to 5 of 5 below. Plastic or Vinyl Duct. Warning If the duct becomes blocked with lint, the duct can become very hot and potentially catch fire. Featured Video. Need more help? Talk to a dryer duct expert Our partners can help you compare quotes from top-rated professionals near you Get a Quote. Advertiser Disclosure.
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