








DuraAir MFB Pro Ventilation Fan for Crawl Spaces, Basements, Attics, and More
The CADPXS DuraAir MFB Pro is built to protect crawl spaces, basements, and storage areas from excess moisture, odors, and structural damage. Delivering an airflow of 220 CFM with seven durable blades, it provides steady, reliable ventilation for healthier air circulation.
At just 5.7 lbs, it’s lightweight and easy to install, with waterproof housing for long-term use. A built-in humidity control ensures the fan runs only when needed, helping save energy while keeping your space safe.
$119.66
Availability: 100 in stock
- Ventilation Fan
- Wall anchors, screws, and cord
- User Manual
- Airflow: 220 CFM
- Dimensions: 18 x 9 x 2 in
- Weight: 5.7 lbs
- Noise Level: <48 dBA
- Voltage: 12V, 45W
- Operating Range: 20%–80% RH
- ETL-Certified
All orders are processed within 1 business day (excluding weekends and holidays) after your order confirmation. Delivery typically takes 5–14 business days, depending on your location. You will receive a tracking number once your order has shipped.
Customer Reviews
5 star | 82 | 82% |
4 star | 18 | 18% |
3 star | 0% | |
2 star | 0% | |
1 star | 0% |
Customer Images
Carl R
Good fan but… Good fan but measure your block! My foundation block is hole is 8x16-1/2” so I didn’t feel comfortable drilling into the corner. I’ll buy some treated plywood to make a larger base. Fan is pretty quiet so it’s not noticeable from inside the house. Update: been a hard worker for quite awhile, almost 2 years but one fan quit working. $19 for a aftermarket fan and we’re back in business!
Carl R
Good fan but… Good fan but measure your block! My foundation block is hole is 8x16-1/2” so I didn’t feel comfortable drilling into the corner. I’ll buy some treated plywood to make a larger base. Fan is pretty quiet so it’s not noticeable from inside the house. Update: been a hard worker for quite awhile, almost 2 years but one fan quit working. $19 for a aftermarket fan and we’re back in business!
Dale S.
Helpful Support, Less Noise Upstairs, Less Humid & Less Musty Downstairs Installation was easy. I removed blades from the existing vent, drilled 4 holes in the block, added the fan, calked around it and plugged it in. I communicated with Mia from Customer Support because I could hear the fan pulsating upstairs when the house was quiet. Also, the air flow seemed light. After sending a couple of photos, they suggested removing one of the vent screens. That seemed to help the airflow. I then added rubber gaskets (photo) between the fan and block to reduce the noise. It is so much quieter upstairs! When I went back upstairs to check my work, I thought that the fan was off! Without reservation, I recommend that you do likewise. Most importantly the crawlspace is less humid and absolutely less musty. Finally, thanks to customer support for substantial support. I recommend that they add 8 rubber gaskets to the assembly.
vintage_tube
Installed 2 of these at a crawl space vent. NIce - works as described. Very happy Excellent for my needs
Bob Dunn
Works as Designed So I’ve been using this exhaust fan for about 20 months now.. This fan works as designed not only for the humidity setting, but also the thermal freeze protection. The temperature has been at or below 30F now for over a week, with the fan thermal protection on. The temps are now above 40F and with a humidity above 60% and as designed, fan started up. If you look at the Radon levels, and humidity levels on the graphs, you can see a slight decrease in both. This shows the importance of air circulation, and pulling out air from the crawlspace. I have a completely conditioned crawlspace with all vents sealed with a dehumidifier installed. Install at least one of these exhaust fans to pull the air out. From what I’ve learned is it’s required for an encapsulated or conditioned crawlspace per the EPA regulations.
Bob Dunn
Works as Designed So I’ve been using this exhaust fan for about 20 months now.. This fan works as designed not only for the humidity setting, but also the thermal freeze protection. The temperature has been at or below 30F now for over a week, with the fan thermal protection on. The temps are now above 40F and with a humidity above 60% and as designed, fan started up. If you look at the Radon levels, and humidity levels on the graphs, you can see a slight decrease in both. This shows the importance of air circulation, and pulling out air from the crawlspace. I have a completely conditioned crawlspace with all vents sealed with a dehumidifier installed. Install at least one of these exhaust fans to pull the air out. From what I’ve learned is it’s required for an encapsulated or conditioned crawlspace per the EPA regulations.
Bob Dunn
Works as Designed So I’ve been using this exhaust fan for about 20 months now.. This fan works as designed not only for the humidity setting, but also the thermal freeze protection. The temperature has been at or below 30F now for over a week, with the fan thermal protection on. The temps are now above 40F and with a humidity above 60% and as designed, fan started up. If you look at the Radon levels, and humidity levels on the graphs, you can see a slight decrease in both. This shows the importance of air circulation, and pulling out air from the crawlspace. I have a completely conditioned crawlspace with all vents sealed with a dehumidifier installed. Install at least one of these exhaust fans to pull the air out. From what I’ve learned is it’s required for an encapsulated or conditioned crawlspace per the EPA regulations.
James A. Hertel
Cut my radon level in half. I put a commercial dehumidifier in my crawl space. My radon levels went up after I blocked off all my foundation vents. This fan cut my radon levels in half. I find it works great in combo with the dehumidifier. They saved me thousands by not having to encapsulate the crawl space. Hopefully they will both last a decent amount of time. The fan was very easy to install.
James A. Hertel
Cut my radon level in half. I put a commercial dehumidifier in my crawl space. My radon levels went up after I blocked off all my foundation vents. This fan cut my radon levels in half. I find it works great in combo with the dehumidifier. They saved me thousands by not having to encapsulate the crawl space. Hopefully they will both last a decent amount of time. The fan was very easy to install.
Charles Michael
Works well I combined mine with smart plugs, so I could cut the power off without crawling under the house, on cold or rainy days
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Frequently Asked Questions
For more details on shipping, click here to view our full Shipping Policy.
Most orders are delivered within 5–14 business days, depending on your location.
If your order is damaged during shipping, contact us immediately with photos or videos of the issue. Keep all packaging and inclusions intact—we’ll arrange for a replacement or refund as quickly as possible.
The DuraAir MFB Pro Ventilation Fan is backed by a 2-year limited warranty:
- First 6 months: Full coverage for parts and labor, including round-trip shipping.
- Months 7–12: Full coverage for parts and labor. Customer covers shipping to CADPXS; return shipping is covered.
- Year 2: Full warranty for replacement parts or equipment. Customer covers round-trip shipping for returns.
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Saved us from purchasing a vapor barrier. 💰
Had musty smell coming from crawl space. Thought we needed a vapor barrier, which I loathed to consider the price. Instead we bought 2 of these fans. Placement: pulling in air in the front of the house and another fan pulling to exhaust the air out back of the house. Creating continual airflow in the crawlspace. Fixed the musty smell. 👍👍👍
Fantastic fan!
This fan is amazing! The Crawlspace is so much better. The house even has a better smell inside.
Garage Fan
it is really helping keep the garage a bit cooler. Plus we also insulated the doors!
Thumbs up
Bought 2 and they work great.
Good product
Very well constructed and quiet running