AlorAir IP55 Grade High Flow Crawl Space Ventilator Fan, 8.7 Inch with Humidistat Dehumidistat and Isolation Mesh, Freeze Protection Thermostat for Attic, Garage, Basements 540 CFM

Model : Ventirpro 540

4.7 Average

$79.11 List Price: $255.60


The VentirPro 540 uses an 8.7" aerofoil fan to produce 540CFM flow and cover spaces up to 5600 cubic feet to provide more efficient ventilation. It is a popular choice for basements, attics, garages and any space that needs air circulation.

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

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Categories:Ventilation Fans
Product Overview

AlorAir 540CFM Crawl Space Ventilation Fan
The Ventirpro 540 fan is an innovative solution designed for maximum airflow, portability and efficiency. The fan is IP55 certified, dust and waterproof and can run stably in any weather. This powerful system is also equipped with a dehumidifier and anti-freeze thermostat to prevent low-temperature failures. Adjustable humidity range 5%-80% RH for basements, warehouses, and crawl spaces from 3600-5600 Cu.Ft.


· Knob control panel, easy to set humidity for running
· Built-in dehumidifier to assist in reducing humidity levels
· Works automatically based on the humidity level you set
· 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 3600-5600CU.FT
· IP55-rated ventilation fan (dust and splashproof)
· Galvanized mounting bracket, sturdy and durable
· 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
· 5ft long power cord


Control impurities – The air inside can be more polluted than the air outside. Our ventilation fan creates a powerful ventilation system that will help expel a build-up of pollutants, bacteria, moisture, and unpleasant odors.

Air regulation - You can't control the flow of air in a building unless you have a good ventilation system. Too much fresh air can mean expensive energy bills, which is why good ventilation in your home is needed to regulate the level of health and safety you need.

Reduce temperatures – When there are a few people in a confined space, the environment can soon become hot and stuffy. A well-ventilated room will instantly be more comfortable - creating a more relaxed environment, while also making for a more productive workplace.

Health benefits – Indoor air pollution coupled with bad ventilation can lead to a number of health problems including headaches, allergies, asthma, rashes, and sinusitis. However, this can be avoided with the installation of a crawlspace fan with a humidistat.

Power 45 W
Voltage 115 V/ 60 Hz
Current 0.51 A
Airflow 540 CFM
Size For 3600-5600 Cu.Ft
Noise Level <55 dBA
Weight 6.2 lbs
Shipping Weight 7.4 lbs
Cord 6 ft
Functioning Temperature Range 35-158 °F
Functioning Humidity Range 5~80%
Dimensions (L x W x H) 15 X 10.2 X 2.8 in

When there is steam and moisture in the air, it can breed mold and creepy crawlies. It can also cause furniture to warp or rot if it doesn't get proper ventilation afterwards. Ventilation fans work to remove unwanted odors, moisture, smoke and other contaminants from the air. When you utilize VentirPro 540 exhaust fans, the vapors are quickly released to the outside. Because it uses five 8.7-inch blades, it not only works efficiently, but also works with very low noise for home use.

Exhaust: Don't let unpleasant odors and pollutants flood your home! With the VentirPro 540 ventilator, you can safely and effectively remove all unpleasant odors from the air. This powerful fan is designed to remove air pollutants quickly, without any chemicals or complicated processes.

Dehumidification: It is perfect for keeping your room cool, dry and comfortable. Its built-in dehumidifier works non-stop with a maximum airflow of 540 cubic meters per minute and ventilates and dries up to 5,600 cubic feet.

Safety: This unit has a built-in thermostat that turns on a self-protection mechanism when it detects an outdoor temperature below 33°F/3°C, stopping the dehumidifier from operating and preventing fan failure.

Reviews & Questions

95% of customers recommend this item

19 Ratings
4.7 Average
5 Stars
500% Complete
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To get the right size

From the Amazon

By 'Ray', Reviewed on July 19, 2023
I put it in a crawl space seems to helping with moisture & odors
Works well but a little loud

From the Amazon

By 'Skip', Reviewed on June 12, 2023
Bought the 540 model, good price and 2 year warranty. Just note most homes have several vents to choose from, after plugging it in my garage to confirm it ran okay I decided to place it away from where we sat outside, it is not super loud but you can hear it running. So if you can place it away from any area with people. I have attached a short video to hear it running. One more thing we can hear it in the house but only in the room above the crawlspace vent where it is mounted.
One step closer to my man cave.

From the Amazon

By 'AJ', Reviewed on May 01, 2023
I installed this fan in my standalone garage and it was easy ! After installing I was ecstatic at how well it worked. It has a thermostat and humidistat. I am looking forward to future upgrades in the garage. I hope that they work as well as this
Strong airflow!

From the Amazon

By 'KSmith', Reviewed on April 28, 2023
I already knew just by being near it that it would definitely pass the toilet paper test. So I threw up something much heavier (the instructions packet/booklet) and it sucked it right up and held. Impressive! My husband is not sure if he is going to be able to make it fit our crawl space vent because our bricks are at an angle, but if not, we will purchase the smaller size from this brand. I like knowing that there is a good, lengthy warranty if anything happens past the Amazon return window which you do not get on a lot of products on here. So far, feeling pretty confident with sticking with this company for our crawl space vent fans. I will update on here if anything goes totally sideways or if we ever run into warranty issues.
Seems good.

From the Amazon

By 'Eric B. Borgman', Reviewed on March 28, 2023
This ALORAIR 540 CFM IP-55 Grade Crawlspace Ventilation Fan seems pretty good. I have yet to install it however, but so far I think it is perfect for what I need it for.
Well built and easy install!

From the Amazon

By 'Gowa', Reviewed on March 27, 2023
Good product l! Would buy again!
Really easy to install

From the Amazon

By 'Scott Smith', Reviewed on March 21, 2023
I am pretty impressed with this fan I use over my woodstove to vent and smoke that comes out the door when I open it and it works great for that. I think the price is right and it has several uses other than what it is specifically designed for. I like the square metal nailing flange I literally cut a hole in my wall I boxed it in to keep the insulation from blowing out. For that I just used some aluminum step flashing I had. Fastened it to the opening and plugged it in I was done in about ten minutes and it does even better than I hope so five stars is the verdict!
Not Loud At All

From the Amazon

By 'Sparky', Reviewed on March 20, 2023
Easy to install and runs quietly. Being able to set humidity and temperature make all the difference in the world. The price is not bad considering how well this is made, it feels like it will last for many years. I would buy again.
set it and leave it

From the Amazon

By 'Snow', Reviewed on March 17, 2023
the humidistat works reasonably well. do not count on it to give you precise readings on your room s humidity, but gives you a directional read, and therefore automatically triggers the fan when humidity is high. this is a great way to set it and leave it type of situation, either attic or crawl space. my advice would be to pair this with a smart plug switch so you can still override the fan, especially if you are setting up the fan in a space you would rarely go. the noise level is okay, measuring 70 db when i am holding my phone near it. considering the use case in seldom visited locations, i would say this noise level is very acceptable.
Powerful with Solid construction!

From the Amazon

By 'Helmers', Reviewed on March 09, 2023
This fan is very powerful. It moves a substantial amount of air and reduces stagnant humidity that compromises the health of your home. It is relatively quiet until you get to the highest CFM (and even then not loud). I have not yet installed it but i have run the looks like installing will be a very simple process (hardest part is probably getting the motivation to climb into attic or crawl space). It may be helpful to enlist a buddy to hold the unit in place while you mount it, because the fan is more robust or heavy that I imagined (also helps to make a mental note or check the dimensions). Overall I am quite pleased with this order and will likely be purchasing another one - so that both the attic and the craw space are well ventilated. I recommend.


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