Quick answer
A door fan is a small electric fan attached to the corner of a doorframe. It increases cross-circulation between two separate but connected spaces, such as two rooms, and is also called a door frame fan or a corner fan for doorways.
- A door fan will not cool or heat a house. It only moves air from one room to the next.
- It mounts to the doorframe with two screws, so the only tool needed is a screwdriver.
- Do not use an extension cord with a door fan, to reduce the risk of fire or electric shock.
You may have seen an odd-shaped fan in a doorway and wondered what it is and how it works.
What is a door fan?
A door fan is a small electric fan that is attached to the corner of your doorframe. Door fans increase cross-circulation between two separate but connected spaces, such as two rooms. They are also called door frame fans.
This article answers the most common questions about door fans: how they mount, what they can and cannot do, and how to use one safely.
Do Door Fans Fit Any Door Frame?
A door fan is made to fit a standard interior door frame.
Walmart’s listing for the Suncourt EntreeAir says it mounts to most door frames using two screws.
Because it is held by screws only, it can be taken down and moved to another door or another home.
How Does a Door Fan Work?
A door fan is mounted directly to your doorframe.
The fan is held by two screws, so the only tool needed is a screwdriver. The shape of the fan makes mounting it a quick job.
Once it is mounted, plug the fan straight into a wall outlet and switch it on with the in-line switch on the cord. The fan gently pushes air from one room into the next. Unplug it when it is not in use.
They typically run at a single speed. Do not add a plug-in speed controller. Suncourt’s instructions for the EntreeAir warn against using the fan with any solid-state speed control device.
Like many electric fans, door fans suck in air from behind the blades and propel it forward out of the front of the fan.
This video shows a door fan in operation:
What Does a Door Fan Not Do?
A door fan will not cool or heat your house. It only moves air that is already warm or cool from one room to the next.
A door fan will not circulate air very well through large spaces, or generate a strong airflow.
Door fans are designed specifically to slowly move air from one space to another.
If you want more power, you are better off getting a wall fan, ceiling fan, or blower fan. Inline duct fans, pedestal fans, or tower fans might also do the trick.
Who Are Door Fans For?
Anyone with doorframes can use a door fan.
You can use a doorframe fan in a:
- House
- Condo
- Apartment
- Dorm room
- Home office
Someone with a large house may use several door fans to help move air throughout the many hallways and rooms.
Retailers describe the fan as a way to spread warm air from a room with a fireplace, or cool air from a room with a window air conditioner, into the next room. Take care around fireplaces, wood stoves and other fuel-burning heaters. Suncourt’s instructions warn that these need enough air to burn properly and vent up the flue, and that too little air can cause back drafting. Keep working smoke and carbon monoxide alarms in the home. Suncourt also says not to use the fan in a window, or in a bathroom or laundry area where it may come in contact with water.
Door Fan Vs. Other Fans: Which Is Better?
If you want a slow-moving fan with a small footprint, you might want a door fan.
Other fans, such as floor or wall fans, can sometimes get in the way or mess up your room decor. Bulky, expensive fans might not be necessary.
Also, if you have small children or pets, floor fans and desk fans can become an unwanted risk.
Door fans attach to the top corner of a doorframe, out of reach.
The fan sits out of reach, but its power cord hangs down to the outlet. Route the cord where it cannot be pulled. Suncourt’s instructions say close supervision is needed when any appliance is used by or near children.
The downside of door fans is that they do not blow very much air. If you want stronger airflow, you’ll likely prefer other residential fans.
What Are the Fans Above Doorways For?
The long, thin fans above doorways are called air doors or air curtains.
Berner, an air curtain maker, describes one as a machine that blows a controlled, high-velocity stream of air across an opening to create an invisible air seal.
They create a barrier of high-speed airflow that keeps air, pests, and contaminants from spreading from one space to another.
You might have seen a downward-facing blower fan mounted over an entrance to a building. Another common application is for the fan to be attached over an opening between rooms that require different temperatures.
Air curtains are also used at walk-in coolers and at restaurant drive-up and pick-up windows. They are commercial equipment, not something fitted over an ordinary house window.
Door fans increase room-to-room circulation, while air doors prevent it.
Do Doorway Fans Really Work?
A door fan works if the goal is modest.
The Suncourt EntreeAir is a 5-inch, single-speed fan that retailers describe as gently circulating warm or cool air between rooms. It can help even out the temperature between two connected rooms.
It will not deliver strong airflow, and it does not heat or cool air on its own.
Are Door Fans Loud?
There is no published noise figure to go on. The Suncourt instruction sheet and the retailer listing checked for this article give no decibel or sone rating for the EntreeAir.
Any small fan makes some motor and air noise, and a fan in a doorway sits close to both rooms.
If quiet matters, for example for a bedroom, read recent buyer reviews for the exact model before buying.
Can You Shut a Door With a Door Fan?
Yes. Walmart’s listing for the Suncourt EntreeAir says it allows the door to open and close without obstruction when properly installed.
The fan is designed to fit in the door frame between the door and the next room.
This feature is useful when you want privacy or do not want to circulate as much air between rooms.
Do Door Fans Come With a Reverse Switch?
The Suncourt EntreeAir has no reverse switch. Its only control is the in-line on/off switch on the cord.
Therefore, you cannot automatically change the direction you want the fan to blow (without remounting the fan).
To send air the other way, the fan has to be taken down and remounted facing the other direction. Follow the template and instructions that come with the fan:
- Unscrew the fan from the doorframe
- Flip the fan over (vertically)
- Remount the fan in the doorframe
Can You Use an Extension Cord With a Door Fan?
No. Suncourt’s instructions for the EntreeAir say not to use the fan with an extension cord, to reduce the risk of fire or electric shock.
The fan comes with a 10-foot cord, according to the retailer listing, which is meant to reach a wall outlet near the door. Plug it directly into the outlet.
ESFI also advises against running extension cords through doorways and treats them as a temporary fix only.
If no outlet is within reach, have an electrician add one or choose a different door.
What Is a Door Fan Test?
A door fan test has nothing to do with the small fans in this article. It is another name for a room integrity test, done on rooms protected by a gas fire suppression system.
A fan is fitted in the doorway to pressurize the room and measure how leaky it is. The result shows whether the room will hold the extinguishing gas at the needed concentration for long enough. Fire protection firm Seatronics notes that NFPA 2001 requires a hold time of at least 10 minutes.
A blower door test sounds similar but is used on homes. The U.S. Department of Energy says many professional home energy assessments include a blower door test.
It checks how airtight the house is.
Can You Still Buy a Door Fan?
There have never been many door fans to choose from. The best-known model is the Suncourt EntreeAir Door Frame Fan (models RR100 and RR100-B). Suncourt now lists it as discontinued, noting it is no longer being produced but may still be sold by some retailers.
It’s small, lightweight, and easy to install.
A Walmart listing checked in October 2026 showed it at $29.19 but out of stock.
If buying leftover or used stock, make sure the mounting template and instruction sheet are included.
Final Thoughts: What Is a Door Fan?
A door fan is a simple way to move a little air between two rooms, but new units are now hard to find. A through-the-wall transfer fan or an inline duct fan does a similar job, though both are bigger installations.
Related posts:
Sources
Suncourt (discontinued products)
Suncourt (EntreeAir Door Frame Fan instruction sheet)
Walmart (Suncourt RR100 listing)
ESFI (extension cord safety tips)
Berner (air curtain 101)
U.S. Department of Energy (professional home energy assessments)
Seatronics Fire (room integrity test)
ASHRAE
U.S. Department of Energy (blower door tests)
Reviewed October 2026. We corrected the extension cord advice, which contradicted the maker’s instructions, noted that the Suncourt EntreeAir is now discontinued, corrected the door fan test explanation, removed unsupported noise and first-person claims, and added fireplace and cord safety notes, using Suncourt, ESFI, Berner and the U.S. Department of Energy.