Also see CLOTHES DRYER VENT TERMINATION & SCREENS. Because rigid duct cannot be bent, it is assembled with elbow fittings that allow the duct to turn 45 or 90 degrees, depending on the type of elbow. For optimum clothes dryer venting we use 4" or larger galvanized metal duct sections and elbows, though aluminum is also acceptable in most locations.Flexible clothes dryer is easy to install, avoids having to mess with elbows in the duct system, and is inexpensive, but that material restricts air flow and may sag, giving you areas that Louvered self-closing internal damper keeps out drafts and provides efficient dryer airflow. Also if you have ever tried reaching into a dryer exhaust duct to clean it by hand and had your arm ripped open by the SMS screw you may have another objection. plastic ties, or second best, duct tape. Semi-rigid metal (usually aluminum) duct is flexible and similar to foil ducting but quite a bit more rigid. That 25-foot maximum length should be reduced by 2 1/2 feet for each 45 degree bend in the ducting, and by another five feet for each 90 degree bend in the vent duct. Like I said before I have one behind my dryer and it is very difficult to reach behind the dryer to tighten the clamps on the dryer and pipe that sticks out of the wall. We have no relationship with advertisers, products, or services discussed at this website. sloppy bending flexduct runs significantly reduce the performance of the vent fan. Transition ducts must not be concealed inside walls or other building cavities and usually have a maximum allowed length of eight feet. Connect the flexduct to the fan itself using 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. Plastic duct is not a UL approved dryer duct material, not code approved and its use will void any dryer manufacturer warranty." 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. This article series describes good practices for clothes dryer vent installation, lint traps, wall vents, filters, and screens. Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. Here are the most common dryer duct materials used to install a dryer vent. The vent provides better air flow than a partly-squashed flexible duct dryer vent, and it resists crushing, therefore it's safer. Second connect the The ribbed interior of the flexible duct easily catches lint. 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. Do not use regular plastic duct tape because it dries out and deteriorates. At above right our second dryer vent duct photo illustrates passage of the duct through the rim joist. Do not vent the clothes dryer indoors nor into an attic, crawl space, or other enclosed area. provide better air flow, smoother internal surface, slower accumulation of lint debris inside the duct system, won't sag due to weight of accumulating moisture or lint, and, John Cranor [Website: /www.house-whisperer.com ] , ASHI certified home inspector (, Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. Building codes often specify "listed" or "L and L" (listed and labeled) duct for all new installations. By having a Periscope dryer vent ducts, you would be able to vent your dryer without the need to have a flexible ductwork. 50. The minimum clearance to the rear wall for this type of clothes dryer vent is 2 1/2". Unfortunately, that is not the case. It is typically installed with clamps. Dryer vent pipes, properly called vent ducts, come in a variety of materials. The dryer vent should be of 4 inch diameter, however when the thin foil or vinyl is used and compressed it as well as reducing the diameter to 3 inches it has lots of ridges to trap and accumulate lint and reduce air flow. Most clothes dryer exhaust vent installations use 4" diameter vent piping, the minimum-allowed. 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. Watch out: some manufacturers recommend against using sheet metal screws to secure dryer duct sections because the screws collect lint. $15.50 $ 15. Most dryer ducts are round and 4 inches in diameter. I had 3 Geek Squad installers for the new washer and dryer (separate trips for various reasons) and none of them recommended the periscope vent kit. This is especially critical in long dryer runs through ceilings and walls where the risk of blockage and fire would be increased. Long Most slim ducts can be adjusted from about 27 inches to about 48 inches in length. Model codes permit use of large-radius dryer vent elbows: Section M1502.6 of the 2006 International Residential Code, Section 504.6.4 of the 2009 International Mechanical Code, Section M1502.4 of the 2009 International Residential Code, Section 504.6.4 of the 2012 International Mechanical Code and Section M1502.4 of the 2012 International Residential Code all permit large radius elbows. Here are other clothes dryer vent materials we have encountered: Watch out: Use rigid or semi-rigid metal dryer vent material [we recommend rigid metal dryer vent ducting]: Virtually all independent authorities, including the US CPSC, Underwriters Laboratories, and the Association of Home Appliance Manufacturers, and experienced home inspectors such as Cranor all recommend the use of rigid or semi-rigid metal ducting for clothes dryer exhaust venting. Whirlpool 4396037RP Vent Periscope – Slim Body. Our photo above illustrates how we connected a clothes dryer outlet through a laundry room wall into an adjoining utility room where the duct could rise to its ceiling and outdoor exit destination. The bottom line is, don't use it. 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. Our metal dryer vent installation shown just below has the right idea, though not a very neat installation and not properly sloped. Get it as soon as Wed, Dec 2. But the variety of materials and duct prices can fool you into making a bad or even a dangerous choice. Underneath the floor, you’ll need to install another periscope dryer vent facing the opposite direction as the one above-head connected to the dryer. It allows you to push the dryer very close to the wall. Complete details about clothes dryer exhaust vent installation are provided below in this article at CLOTHES DRYER VENT INSTALLATION DETAILS. Also we explain and illustrate problems that result from improper dryer vent installation design, materials, routing, and filtering including dryer vent clogging, clothes dryer fire hazards, building moisture and mold problems, and increased clothes dryer operating costs due to poor or blocked dryer vents. It has a wide rectangular shape except for the two ends where it connects to the dryer and the vent outlet. Find Aluminum periscope dryer vents at Lowe's today. Whirlpool® In-Wall Periscope Vent. So a clothes dryer vent with three 90 degree bends to come out of the back of the dryer, run up a wall, and then across a ceiling or under a floor to a wall vent would have a maximum length of (25 - (3x5=15)) just ten feet! or leaks into the structure. That duct caused the dryer to stick out about 6 1/2 inches from the wall. Builder's Best - 10149 084149 SAF-T-DUCT Zero Periscope Adjustable Dryer Vent Periscope, Adjustable 0-5" Length. In these locations spilling laundry dryer vent moisture will certainly encourage mold growth. Keep all connections tight and avoid air leaks. An acceptable alternative that is nearly as effective is semi-rigid metal duct work, though we have found that that material is easily dented, crushed, or damaged. If the wall vent does not allow the periscope vent to sit flat against the wall, any advantage is lost (see photo after Geek Squad installed the periscope vent). This is often a problem since dryers tend to be tucked away into small areas with little room to work. Metal tape can be used, too, but clamps make it easier to remove the tubing for cleaning. (right) I stuck this guage’s right-angled terminal tube into a vertical section of the vent to measure static pressure. Like foil duct, semi-rigid is used only for transition ducting and should not be concealed in walls or floors. Introducing "One Thing": A New Video Series, The Spruce Gardening & Plant Care Review Board, The Spruce Renovations and Repair Review Board. Preparing the Offset Dryer Vent . Dryer vents are often made from flexible plastic or metal duct, which may be easily kinked or crushed where they exit the dryer and enter the wall or floor. If the space behind the dryer was any less than the minimal amount required for a periscope vent it would not be possible to get to the clamps. 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. Best answer: Yes you can get closer to the wall with the periscope about 2’ then you can with the regular dryer vent hose. Other options New and used from $6.45. The vent shown can be used on clothes dryers made by Admiral, Amana, Caloric, Crosley, Estate, Inglis, Jenn-Air, KitchenAid, Roper, Vesta, and Whirlpool. 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. The periscope dryer vent duct is ideal for tight place as well. It has a flexible body just 18 inches long. Always use metal duct tape to secure the joints; don't use screws, because they catch lint. To get started, we pulled our dryer away from the wall and disconnected the duct from the dryer and wall with a flat head screwdriver. U.S.D. collect water and risk leaking into the building. This dryer vent is designed for safe indoor venting and can be used when it is not possible to use outdoor ventilation for your dryer. Indoor dryer vent buckets contain water in a bucket, to which the dryer vent is attached. Also, dryers may come with the manufacturer’s specifications for ducting to use with a particular model. An exception to this length reduction for dryer vent elbows may be permitted for large-radius bend dryer vent products such as Dryer-Ell®. 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. The Spruce uses cookies to provide you with a great user experience and for our, Installing an Over-the-Range Microwave Oven With Vent Fan, Routine Dryer Vent Maintenance Can Prevent Fires, How to Install a Dryer Vent in a Tight Space, Some Easy-To-Use Tips That Will Reduce Basement Condensation, How to Disconnect, Move, and Install a Clothes Dryer, How to Reduce and Remove Lint From Clothes and Upholstery, How to Clean Your Dryer Vent and Reduce Fire Risk. [Dryer-Ell is at http://dryer-ell.com/ ]. If the duct becomes blocked with lint, the duct can become very hot and potentially catch fire. mobile home. That's because a normal 4-inch 90-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 10-inch radius. Terminate exhaust vent outside. (See the dryer vent duct photos just above).Watch out: manufacturers typically advise against using screws to secure dryer vent duct sections as the end of the screw protruding into the duct interior increases lint-trapping and may make the vent duct harder to clean. Click to Show or Hide Citations & References, CLOTHES DRYER VENT TERMINATION & SCREENS, CLOTHES DRYER VENT CLEARANCES & TERMINATION, CLOTHES DRYER LINT CLOG RESISTANT SCREENS, HOME INSPECTION EDUCATION COURESES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES. We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. InspectAPedia tolerates no conflicts of interest. A periscope dryer vent let the dryer sit closer to the wall, and the smooth metal collects less dryer lint than a flexible dryer hose. This duct section can be inspected and if necessary cleaned by removing the outside vent cover. This can be a great space-saver as long as the dryer and the vent are close together. Above you can see that we had to use a pair of elbows to lift the dryer vent duct into the building ceiling cavity. Although we have observed this material widely used in homes as "dryer vent ducting" it should not be used for that purpose.Cranor elaborates: "Plastic" dryer duct" sold at various suppliers does not say on the packaging that it can be used for clothes dryer ducts....it specifically says bathroom venting. Get it as soon as Wed, Nov 18. They're solid metal as well, so you won't have to worry about poking holes in them or bending them like you would with a hose. The maximum length for dryer exhaust duct Complete kit with all parts necessary to vent your dryer. [2][4][5][6][7][8]. It is made from flexible foil so it can be folded up when it is not in use to save space. Dryer vents are usually placed toward the bottom of a dryer, and the vent in the wall is usually placed with a mind for convenience, rather than suitable proximity to the vent outlet. 50. Some are flexible, and others are rigid. 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. This hazard has resulted in numerous house fires. Above: I'm checking a two-louver dryer wall vent hood that is somewhat resistant to lint clogging. Industry standards recommend that the maximum "concealed" rigid metal ducted clothes dryer vent length be no more than 25 feet (IRC; some codes permit 35-feet). UPDATED RANKING https://wiki.ezvid.com/best-periscope-dryer-vents Disclaimer: These choices may be out of date. 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. Find periscope dryer vents at Lowe's today. Our second clothes dryer vent exhaust mistake is shown above: the installer hung the vent opening at the crawl space vent screen. FREE Shipping on orders over $25 shipped by Amazon. I had to buy 2 connector to get the job done because the connectors on the periscope just aren’t long enough. Our dryer vent installation photos just below illustrate use of 4" galvanized metal dryer ducts.
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