AlorAir 540 CFM BasementVentilation Fan with Humidistat Dehumidistat, IP55 Rated Exhaust for Crawl Space, Attics, and Garages

Model : VentirPro 540S

4.8 Average

$83.66 List Price: $89.66


The VentirPro 540S ventilation fan delivers powerful and stable airflow thanks to its precision-engineered motor combined with a powerful 5-blade axial fan that delivers a generous 540 CFM of airflow, minimizing energy consumption and maintenance.

Highlights: IP55/ Isolation Mesh/ Anti-freeze Thermostat/ 2 Years Warranty

Buy on Amazon is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Additionally, participates in various other affiliate programs, and we sometimes get a commission through purchases made through our links.
Categories:Ventilation Fans
Product Overview

AlorAir VentirPro 540S Ventilation Fan
The Ventirpro 540S ventilation fan features heavy-duty stainless steel construction with an IP55 rating designed to prevent condensation and rust for longer life. A barrier screen stops flying insects and reptiles from entering and disrupting the proper operation of the machine. With a built-in dehumidifier to help dry the humidity in the air and a memory function to automatically start and shut off, you can use it with confidence in basements, attics, warehouses and more.


 · Easy-to-use knob adjustment
 · Built-in dehumidifier to assist in reducing humidity
 · Memory function, it will automatically switch on and off according to the set humidity value
 · Equipped with an anti-freeze thermostat to detect the outdoor temperature, the dehumidifier will not operate when the temperature falls below 35°F/1.7°C
 · Suitable for reducing humidity in your space from 3600-5600 Cu.Ft.
 · IP55-rated ventilation fan (dust and splashproof)
 · Canned ball bearing motors: reduce energy consumption and noise levels
 · Stainless steel mounting frame for higher water resistance and protection
 · After installation, panels can be trimmed to match non-standard base openings
 · Thoughtful addition of barrier mesh to prevent crawlers from entering and affecting the operation
 · Adjustable humidity range of 5%-80% RH to meet different environmental needs


Improve Air Quality - Our ventilation fans help you get rid of murky, closed-off air, like humidity and odors. They also help regulate airflow and create a healthy, safe environment for air exchange.

Improves Comfort - Effective ventilation prevents heat buildup and lowers the temperature in stuffy, crowded rooms, keeping you more comfortable and preventing heat from entering your living space.

Reduces Indoor Pollution - Mold and viruses tend to stay in dark environments. AlorAir crawl space basement fans keep your basement cool and dry with 540 cfm airflow. Removes contaminants and pollutants.

Protects Health - Proper ventilation significantly reduces indoor air pollution and reduces the risk of headaches, allergies, asthma and other respiratory-related health problems.

Power 115 V/60 Hz, 45 W
Current 0.51 A
Air Flow 540 CFM
Ideal For 3600 - 5600 cu.ft
Sound Pressure Level < 55 dBA
Operating Temperature 35 - 158 °F
Humidity Range 5~80%
Power Cord Length 5 ft
Weight 6.2 lbs
Shipping Weight 7.4 lbs
Dimensions (L*W*H) 15 x 10.2 x 2.8 in
Loading quantity 20’: 287 Sets; 40’: 619 Sets; 40’HQ: 701 Sets

Airborne vapors and excess moisture not only promote mold and pests but can also attack and damage walls and furniture. Ventilation fans let fresh air in by extracting air from basements and crawlspaces. The built-in dehumidifier helps remove humidity from the environment. With the VentirPro 540S exhaust fan, with its 8.7-inch, 5-blade design, steam is quickly expelled outside and its operation at only 55 decibels won't bother you. This makes it ideal for home use. With its powerful features and low power consumption, this fan is guaranteed to keep you quiet and comfortable.

Improved Air Circulation - The 540CFM axial fan reduces the risk of mold and vapor buildup by improving airflow and eliminating stagnant air. It circulates indoor air and brings in fresh air from outside. This improves air quality and allows you to breathe easier.

Reduce Indoor Humidity: Ventilation fans are also very effective at reducing indoor humidity, especially when installed in bathrooms and crawl spaces. Stagnant and humid air is exhausted by dehumidifiers to prevent moisture buildup and create a healthy, comfortable indoor environment.

Cost Savings: ventilation fans are much cheaper than any dehumidifier or air conditioner, but they're sufficient for normal dehumidification of crawl spaces and basements. And the memory function of our sensors automatically turns off when the humidity reaches the set level, so you save on electricity costs.


Proper Use and Maintenance
INSTALLATION MATTERS: Crawlspace fans must be installed in electrical control boxes and motors facing inside the crawlspace.
1. Confirm that the doors and vent covers of the buildings around the installation are open.

2. In order to ensure the stable installation of the crawling space ventilator, it is necessary to mark four points on the wall to confirm the installation position.

3. Install the crawl space ventilation fan to the wall with 4 screws and observe the horizontal direction of the fan.

4. Note: If the mounting surface is a base block or brick. Before the fan is installed, a 5/16-inch hole needs to be drilled with a masonry drill bit. Install wall anchors at the openings and secure them.

If installed on a mesh of wood aggregate, edge joists, or existing crawlspace vents, secure crawl space vents with screws, washers, and nuts at the four corners of the metal panel of the vent.

Reviews & Questions

95% of customers recommend this item

17 Ratings
4.8 Average
5 Stars
500% Complete
4 Stars
400% Complete
3 Stars
300% Complete
2 Stars
NAN% Complete
1 Stars
NAN% Complete
Built like a tank, and works like a dream.

From the Amazon

By 'Aaron B', Reviewed on May 10, 2023
This is a top quality vent fan. Crawl spaces, basements, garages, anywhere you need to vent out humid air, this is an excellent fan to do so. It is built to last, all metal. It has a seriously sensitive knob, and the moment the conditions in the area match the number on that dial, this baby starts moving the air with a quickness. It is powerful and quiet, and I would say it certainly deserves the high-ish price tag. Do be careful and wear some gloves during the install, because the fan housing has some sharp steel edges that could easily cut you.
Humidity activated fan

From the Amazon

By 'E Seto', Reviewed on May 10, 2023
This is a high quality crawl space fan that has a controller that can be set manually to on or off, or to a humidity setting in which then fan will automatically turn on/off. I took a close up photo of the control panel and the bag of install hardware. I did not test the how well the humidity setting works, but the fan runs smoothly. It cycled on/off at the humidity level of my living room which was around 40%. It is fairly high power at over 500 cfm. The high cfm means it is certainly not silent when the fan is running. The face plate of the fan looks like stainless steel. It comes with instructions and instal hardware. I actually do not have a crawl space but the lower level of my house does seem more humid than upstairs and so I was thinking of using the fan to improve circulation. Or using it to exhaust the garage on hot summer days. Or reduce AC usage in the house by running this instead of AC after sundown to exchange the hot air inside the house with the cooler air outside. Basically there are lots of use cases besides a crawl space fan.
Small but mighty

From the Amazon

By 'D. Rose', Reviewed on May 10, 2023
My house was built in 1895 and sits next to a stream. Moisture can be an issue Spring through Fall, so I thought I would give this a try rather than a costly dehumidifier. Plus, it can pull the air in from other open windows to "air out" the basement quickly and helps dry out what little moisture I have this time of year. This is a really well-made fan and seems powerful for all the bigger it is and happy I ordered it.
Nice fan, strange controls

From the Amazon

By 'flounderguts', Reviewed on May 09, 2023
I was pretty stoked when I pulled this out of its box. The metal mounting flange looks great, and you can tell this is a quality item. I was pretty happy to see the fine mesh in the unit. Do not expect this to be quiet! It pushes a lot of air, and to do so it is pretty loud. Having said that, it does move almost as much air as advertised, and the discrepancy could be due to my unusual mounting. It has an interesting knob control that is marked in duty cycle percentage. It took me a while to figure out exactly how it works, but it is easy to dial in and walk away without worrying. If you plug it in and leave it in the on position, you can use other switch criteria to turn it on and off. It does have an auto temp switch that shuts it off below 35F
Great in our basement vent to outside

From the Amazon

By 'A. Poser', Reviewed on May 02, 2023
Got this for our basement that is relatively dry, but could use airflow on humid days and this is several cuts above your average plastic window fan with the construction and the power being so much better and the humidistat on it is really helpful. The power is awesome and effective. The fan is a little noisy with it going so fast. It is the perfect size for where we need it, actually where a stove exhaust used to be. For us it is perfect, in terms of practicality.
Low power consumption, quiet exhaust fan

From the Amazon

By 'dwm crhtbfjb', Reviewed on April 16, 2023
After 24 hours of continuous operation, the effect is good, the humidity in the space has been greatly improved, and the smell has dissipated a lot.
Well manufactured

From the Amazon

By 'hjkbt brs', Reviewed on April 16, 2023
The package is well packed, made of stainless steel, simple to install, the fan does not occupy a large footprint, moves quite a lot of air, and everything is fine at the moment.


Related Products