What is an Indoor Dryer Vent?

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  • Written By: CW Deziel
  • Edited By: C. Wilborn
  • Last Modified Date: 03 October 2019
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An indoor dryer vent is one that doesn't have to be routed outdoors. Although a dryer is best vented outdoors for safe operation and heating efficiency, using an indoor vent can be more practical if the laundry room is located too far from an exterior wall, or cutting through the exterior walls is too difficult. An indoor dryer vent kit typically includes a reservoir of water to catch lint and other debris from the dryer that would otherwise be dissipated into the air by an outdoor vent.

A typical outdoor dryer vent kit includes rigid stainless steel duct pipes, clamps, and an exterior vent cap. The duct pipes are installed along the shortest path from the dryer to an exterior wall and clamped to the dryer vent opening. The vent cap is usually screwed to the siding. Installation requires cutting a 4-inch (10 cm) hole in the side of the house through which the duct pipe attached to the vent can extend. It may be impractical to make this hole if the house is brick or has another type of siding that is difficult to cut through.


Using an indoor dryer vent circumvents problems associated with routing pipes and cutting through brick walls. Instead of a vent cap, the pipes of an indoor dryer vent kit terminate in a reservoir of water that can be installed in any convenient location, even directly adjacent to the dryer. Some reservoirs can be mounted on the wall with screws, and some are designed to simply sit on the floor in an accessible location. Instead of rigid pipe, an indoor dryer vent kit usually includes a length of flexible duct pipe that can be secured to the dryer outlet and the reservoir with clamps.

Properly venting a dryer is essential for its safe operation and for the comfort of the home. Dryers expel warm, moist air that can significantly increase the humidity of the laundry and surrounding rooms and cause a host of problems, including damage to the drywall and the increased occurrence of mold. A dryer also expels lint, which can create a fire hazard if not collected and disposed of properly. The water in the reservoir of an indoor dryer vent kit collects both excess moisture and lint effectively, but must be cleaned at regular intervals. To facilitate cleaning, the reservoir usually has screw threads or snaps to make it easy to disassemble without the need for special tools.


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Post 3

I have a stack washer and dryer unit with an indoor dryer vent, and my advice to anyone is to maintain it as well as you can. Invest in a dryer vent brush and cleaner. Keep the indoor dryer vent lint trap clean.

When I first did the dryer vent installation, I ended up positioning the dryer vent hose too close to a wall. The expelled heat had nowhere to go, so that part of the wall got very moist, triggering a mold problem. I got some really good advice from the home improvement store, and I installed a sheet of heat-resistant material on that section of the wall.

Post 2

I think I'm going to need an indoor dryer vent if I'm ever going to have my own washer and dryer. The one room that has a 220 volt plug was not really set up to be a laundry room, so there is no good place to install an outdoor dryer vent. The hook-ups and drain for a washing machine are in the kitchen, but the 220 volt receptacle is in our home office. It has a window near the plug, but I don't see how anyone would be able to create an outdoor vent there.

When the day I bring home a washer and dryer from the store arrives, I think I'm going to hire someone to do the dryer vent installation. I don't want to make a rookie mistake and cause a fire or anything.

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