How To Vent A Bathroom Without A Window

A bathroom without proper ventilation and windows can be frustrating. With no moving air, the buildup of moisture can damage the walls, promotes the growth of mold and other microorganisms. Not to mention the nauseating, dank, musty smell that will trigger your allergies and affect your health. Luckily all hope is not lost. Here are several useful tips on how to vent a bathroom without a window. All the methods below are personally tested by us that require minimal effort and time. Your journey of a clean and dry bathroom starts now!
Short answer
Exhaust fan, dehumidifier, wipe, open door.


1. Install An Exhaust Fan/ Ventilation Fan

Exhaust fan is the most effective way of removing excess moisture in a bathroom without windows. It can be set to run automatically every time you switch on the light. By pulling the moisture out through the motor fan, your bathroom will remain cool, dry, and odor-free with no mold pathogens to worry about. An exhaust fan also reduces the risk of rust and decay in the bathroom.

The bigger the exhaust fan, the quicker moisture will be removed. There are a few types of exhaust/ ventilation fans in the market. We recommend getting a ceiling exhaust fan because it is inexpensive and conceal from eyesight. A wall exhaust fan is typically more powerful given the bigger fan, but it can be loud and tricky to install.

The only drawback with the exhaust fan is the expensive installation. Some hacking and drilling are needed, and you might need to hire an expert to do so. Some buildings and apartments might even restrict you some installing one due as it is not part of the building code.

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2. Get A Dehumidifier

The perfect appliance for a windowless bathroom. A dehumidifier will absorb excess moisture generated after a hot, steamy shower. The standalone device will effectively suck and collect the water vapor into the reservoir or straight to a floor drain through condensation. Unlike an exhaust fan, no installation is required and will work straight out of the box. Best of all, it is inexpensive where you can get a 22-pint/ 30-pint dehumidifier for under $200.

Refrigerant and desiccant are the 2 most common types of dehumidifiers. You should only go with a refrigerant dehumidifier as it can drain and hold more water vapor than a desiccant could.

The downside with a dehumidifier is the bulkiness. It is unlikely you will have the space to place it in the bathroom and not get it wet; you will have to leave it outside, which can be cumbersome in a small room. Then there is the hassle of having to turn it on every time you hit the shower and empty the water tank. The motor noise is also deafening loud to the point you would rather live with the excess moisture.

3. Wipe And Mop

Simple it may seem, wiping and mopping any spills and water drips can help keep the dampness level down, especially in a bathroom with no windows. It removes the accumulated water droplets that would otherwise evaporate and increase the humidity level in the bathroom.

To get started, all you need is a dry rag/ cloth and a mop. Mop the floor first after a shower and wipe the fogged mirrors, tiles, bathtub, and basin. Repeat the steps until all water droplets are removed. The entire process is tedious and time-consuming, but it is free, rewarding, and, most importantly, can prevent mold growth.

4. Do Not Dry Towels Inside

A small change that makes a big difference. Avoid drying a wet towel inside a bathroom with no windows. A wet towel holds a tremendous amount of moisture that will evaporate and adds dampness to the bathroom. It will amplify the mustiness smell as the damp air remains stale with no place to air out. Hang your wet towel outside or anywhere else other than the bathroom.

5. Open Door

Another simple yet often neglected step. Always keep the bathroom open, especially after a hot shower. Doing so increases air circulation and allows trapped humid air to flow out. While you’re at it, make sure the shower curtain is folded to reduce the airflow obstruction. You will see a tremendous drop in dampness in the bathroom compared to a closed door.

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6. Use An Air Purifier

An air purifier can help circulate clean air and reduce mold spores, mildew buildup in a bathroom with poor ventilation. It compliments a dehumidifier well by removing airborne pollutants that will affect humidity and foul odors. Unlike a dehumidifier that requires a lot of room space, you can get a compact air purifier with a HEPA filter and an activated carbon filter next to the basin (Just make sure not to get it wet).

While an air purifier effectively moves air, it is not a necessity as a dehumidifier. It cannot remove moisture collected in the bathroom. The filter also requires regular replacing, which adds up to the cost. If you already have an air purifier in the room, there is no need to get an additional unit.

7. Use A Disposable Moisture Absorber

For a quick and temporary solution, plenty of moisture absorbers like Damprid and Dri-Z-Air can help with humidity issues in a windowless bathroom. Most moisture absorbers come in a small bag or a container of calcium chloride crystals or silica gel that absorb excess moisture from the air. Some even come with a scented fragrance that can mask any musty odor. Just hang the moisture absorber by the toilet or leave it at the basin table and replace them according to the interval time (30-90 days).

The biggest issue with a moisture absorber is its usefulness. It is not as effective as a dehumidifier in removing moisture; not even close. The crystals will fill up quickly, and you will need to replace them promptly. While moisture absorber is relatively cheap (between $1-5), you will need multiple packs to see a difference, and the cost will stack up exponentially. Consider this as a last resort.

How To Vent A Bathroom Without A Window

Final Thoughts

We hope this guide will solve the humidity issues in your windowless bathroom or basement for good. As simple as some of the method sounds, it is proven effective in ventilating a bathroom and keeping mold away. Feel free to mix and match a few of the methods above that can help with your situation. Whatever floats your boat.

Max Fernandez

A loving father and a dedicated reviewer for airfuji.com with more than 1000 air purifiers under his belt. Max Fernandez is also one of the million patients currently suffering from asthma. Feel free to nudge him if you have any questions.
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