The Tjernlund under-ceiling air exchanger (aka under-rafter air exchanger, under-ceiling ventilator, under-roof ventilator) is specially designed to ventilate crawl spaces, under-floor spaces, and low-ceiling rooms like garages, that are located below the main living space. In this article, we’ll review our top picks for under-ceiling air exchangers, and give you some key things to consider before buying one. And, if you’re curious, this is what our crawl space ventilator looks like (it’s the Tjernlund TUC125-4).
In the following table, we have listed the important features of Tjernlund under-ceiling air exchangers.
10 Best tjernlund underaire crawl space ventilator Reviews in 2023
You may be wondering what the best vent fan for crawl space is. Crawl spaces are notorious for being damp, musty, and having very little ventilation. As a result, these areas are prime for mold and mildew growth, which can be harmful to your family’s health.
To combat the humidity, you’ll need to install a vent fan in your crawl space.
1. Tjernlund V2D UnderAire Crawlspace Ventilator Fan Moisture Mold Reducing,220 CFM
Features :
- Power ventilate musty, damp crawl spaces through existing passive vents
- Faceplate is sized for ventilation openings through standard block foundations
- 220 CFM, 40 watt maintenance free exhaust fans
- Includes adjustable dehumidistat, freeze protection limit and 6 foot grounded power cord
- Faceplate can be trimmed to match non-standard foundation openings.Dehumidistat control also will not operate if the freeze protection thermostat senses low outdoor temperatures
Additional Info :
| Color | silver |
| Item Dimensions | |
| Height | 4.7 |
| Width | 22 |
| Length | 12.8 |
| Weight | 6.5 |
This is a one-speed fan that is suitable for a 12 x 12-foot room. It is backed by a 5-year limited warranty. The fan is UL listed and it complies with Energy Star standards. It is also approved by the Building Officials’ Association. The TJernlund ventilator has a very high CFM rating. It is designed for areas with high moisture levels such as a bathroom, laundry room, or kitchen. The fan is meant to be installed in a basement or crawlspace.
It will not work in an attic. The unit weighs 3. 5 pounds and has a dimension of 7 x 7. 5 x 7. 5 inches.
2. Tjernlund V2D Model UnderAire Crawl Space Fan Ventilator, Deluxe 2 Fan, 220 CFM and 950-8304 Underaire Steel Crawl Space Vent, Steel Diamond Pattern, 18″ x 10″ Screen bundle
Features :
- Power ventilate musty, damp crawl spaces through existing passive vents
- Faceplate is sized for ventilation openings through standard block foundations
- 220 CFM, 40 watt maintenance free exhaust fans
- Includes adjustable dehumidistat, freeze protection limit and 6 foot grounded power cord
- Sturdy Galvanized Steel Construction Increases Product Durability and Lifespan
- Install from Outside or Inside of Crawl Space
- 18″ x 10″ to Cover Block Foundation Wall Openings
- Professional Modern Decorative Designs with Over 80% Open Area
Tjernlund v2d under-cave fan is a two-speed fan that includes both a low and high setting. It is ceiling mounted with a 10″ x 18″ size and has a 1. 5-inch duct. The deluxe model comes with a steel under-cave vent, which is specifically designed for installation in a crawl space.
The under-cave vent is made of durable steel, with a diamond-patterned screen to prevent debris from entering the fan. It is designed specifically for use with Tjernlund’s under-cave fan and comes with a 10-year warranty. The under-cave fan is also available as a non-diamond patterned unit.
3. CADPXS Crawlspace Ventilation Fan, Crawlspace Fan vent with humidistat, Dehumidistat & Freeze Protection Thermostat, for Crawl Spaces/Basement/Garage/Attic/Hydroponics Grow Tents (220 CFM Air Out)
Features :
- 【Crawlspace Vent Fan】 Air Out. Airflow: 220 CFM. 18″ x9″ x2”. Dual fans with 6.56 foot grounded power cord. Ventilate a wet crawl space. Exchange the outdoor and indoor air, improve room air quality and balance the humidity
- 【Crawlspace Fan with Humidistat】 Built-in dehumidistat, 20% – 80% RH Range. Exhausts vent radon gas, treated wood gases and odors, prevents migrating into living areas
- 【Attic Fan with Freeze Protection Thermostat】 Dehumidistat control also will not operate if the freeze protection thermostat senses low outdoor temperatures
- 【CADPXS Quality And Wide Use】 CADPXS Pro crawl space fan, designed to control the temperature and humidity levels of your crawlspace, basement, attic, garage, hydroponics, and planting tents,Increases air circulation to protect home and occupants
- 【Easy-to-Operate Vent Fan】 Features knob control panel, easy to set time for running. Just plug it in, set it and forget it. Easy to exhaust vent radon gas, treated wood gases and odors, prevents migrating into living areas
- 【Warranty】 The warranty is effective for 1 year from the purchase date. Please don’t hesitate to contact us if there is any question, we will reply to you within 24 hours and help you solve the problems. CADPXS customer support team is always just one-email away
Additional Info :
| Color | Silver |
| Item Dimensions | |
| Height | 2 |
| Width | 9 |
| Length | 18 |
| Weight | 5.7 |
Cadpxs crawlspace ventilation fan is a great product for a clean, dry and odor-free crawl space. The fan is designed to be easy to install and supports both a humidistat and dehumidistat. It has an energy-saving design and comes at an affordable price. The fan is designed to be mounted on a joist in the crawl space and comes with a pre-installed galvanized metal ducting.
It has a 4-inch ducting and an outlet diameter of 5 inches. The fan has a flow rate of 220 cubic feet per minute. It is UL listed and has a 1-year warranty.
4. Tjernlund 950-8304 Underaire Steel Crawl Space Vent, Steel Diamond Pattern, 18″ x 10″ Screen
Features :
- Sturdy Galvanized Steel Construction Increases Product Durability and Lifespan
- Install from Outside or Inside of Crawl Space
- New two piece design meant to measure 18 x 10″ In total
- Professional Modern Decorative Designs with Over 80% Open Area
- Mounting Hardware Included
Additional Info :
| Item Dimensions | |
| Height | 20 |
| Width | 2 |
| Length | 16 |
TJernlund 950-8304 is an under-the-house ventilation system designed to efficiently remove moisture and odors from your crawl space. This TJernlund product is designed to pair with TJernlund 950-8300 and can be used as a stand-alone unit if you do not have a TJernlund 950-8300. The TJernlund 950-8304 is a steel-framed crawl space vent that is designed to last for as many as 20 years with little to no maintenance.
The TJernlund 950-8304 is also an Energy Star-rated product that protects homeowners from high energy bills.
5. Durablow Stainless Steel Crawl Space Foundation Fan Ventilator + Built-in Dehumidistat (Stainless steel silver, M2D-S430)
Features :
- ▼ Air Out ▼ Dimensions L x W x H: 18″ x 9″ x 2″. ▼ Seven Leaves AC Axial Fan. (Dual fans with power cord).
- ▼ Freeze protection thermostat. ▼ UL listed components used. ▼ Measure your crawl space vent opening size before purchasing.
- ▼ Benefits: 1. Reduces moisture in crawl spaces / foundation to protect home and occupants. 2. Increases air circulation to prevent condensation and wood rot. 3. Exhausts vent radon gas, treated wood gases and odors, prevents migrating into living areas. 4. ON/OFF automatically with SET humidity % level. 5. Exchange the outdoor and indoor air, improve room air quality and balance the humidity.
- ▼ It helps to reduce radon level in crawl space, since radon (density) is heavier than air, radon will precipitate in lower floors. ▼ 100% Stainless Steel 430 Grade panel & housing box for longer life in humid environment. (Better than other brands’ Galvanized Steel.)
Additional Info :
| Color | Stainless Steel 430 |
| Item Dimensions | |
| Height | 18 |
| Width | 9 |
| Length | 2 |
The Durablow Stainless Steel Crawl Space Foundation Fan with Built-In Dehumidistat is one of the top-rated options on the market. The fan has a maximum capacity of 2,300 cfm, which is suitable for most residential homes. The dehumidistat has a range of 35 to 75 percent relative humidity (RH).
The crawl space fan has an IP55 rating, which makes it suitable for outdoor use in rainy conditions. The dehumidistat has an operating range of 45°F to 90°F, and it turns on when the RH in the crawl space rises above 35 percent.
6. Denwenny IP55 Grade 540CFM Crawl Space Ventilation Fans with Dehumidistat, 8.7inch Basement Vent Fans with Isolation Mesh, Freeze Protection Thermostat Ventilator Fan for Crawlspace, Attic, Garage
Features :
- 【Functions & Applications】High-Flow Powered Ventilator Fan for damp crawl spaces，Basement, ttic and Garage to reduce Humidity. It can increase air circulation to stop condensation and wood rot. Also, used for exhausting vent radon gas, treating wood gases and odors, and preventing them from entering into living spaces.
- 【Key Features】Built-in dehumidistat and Freeze Protection Thermostat. The Dehumidistat control will not operate if the freeze protection thermostat senses low outdoor temperatures.
- 【Main Characteristics】√ IP55 rated fans, Be Stable working in humidity Crawl space. √ Isolation Mesh，Comes with a fence to stop reptiles from crawling into your living space.
- 【Product Detail and Installation】Air Out; 15 x 10 x 3.1 inches; Capacity: 540 CFM; 115 Vac ~ 50/60 Hz. 0.51 Amps; Noise: <40dB. When installed, Faceplate can be trimmed to match non-standard foundation openings.
- 【Warranty】Valid for 2 years warranty from purchase date. Denwenny’s customer support. The team is always one email away.
Additional Info :
| Color | Silver |
| Item Dimensions | |
| Height | 11.02 |
| Width | 15.04 |
| Length | 3.11 |
| Weight | 5.7 |
And basement. This residential grade dew point sensor ventilation fan is designed to effectively remove the damp, musty and moldy odors from the space below the bathroom or kitchen. With a dual function thermostat and dew point sensor, this unit prevents condensation from occurring in the first place, by turning off the fan when the dew point has been reached, and then automatically turning the fan back on when the temperature drops again.
The denwenny fan is built with a heavy-duty galvanized steel housing, stainless steel blades and a galvanized steel fan grill.
7. Denwenny 260CFM Crawl Space Ventilator Fan with Isolation Mesh, 6.7 Inch Basement Vent Fan with humidistat & Dehumidistat, Ventilation FansFreeze Protection Thermostat for Crawlspace, Garage, Attic
Features :
- 【Functions & Applications】High-Flow Powered Ventilator Fan for damp crawl spaces，Basement, attic and Garage to reduce Humidity. It can increase air circulation to stop condensation and wood rot. Also, used for exhausting vent radon gas, treating wood gases and odors, and preventing them from entering into living spaces.
- 【Key Features】Built-in dehumidistat and Freeze Protection Thermostat. The Dehumidistat control will not operate if the freeze protection thermostat senses low outdoor temperatures.
- 【Main Characteristics】√ IP55 rated fans, Be Stable working in humidity Crawl space. √ Isolation Mesh，Comes with a fence to stop reptiles from crawling into your living space.
- 【Product Detail and Installation】Air Out; 13.3 x 9 x 2.8 Inches; Capacity: 260 CFM; 115 Vac ~ 50/60 Hz; 0.25 Amps; Noise: <40dB. When installed, Faceplate can be trimmed to match non-standard foundation openings.
- 【Warranty】Valid for 2 years warranty from purchase date. Denwenny’s customer support. The team is always one email away.
Additional Info :
| Color | Silver |
| Item Dimensions | |
| Height | 9.06 |
| Width | 13.35 |
| Length | 2.8 |
| Weight | 4.03 |
, or basement. This product is a great ventilation fan for the basement. It has an adjustable thermostat and will shut off if it gets too hot. It is easy to install and the only issue that I have observed is that it is a bit noisy. This can be a great product for those who are looking for a way to reduce the moisture in the basement.
The installation of this product is easy and can be done by yourself. It is a great product that will keep your basement dry and safe. It is a vent fan with a dehumidistat and is also a freeze protection thermostat.
8. Tjernlund RV2 Radon Ventilation Fan for Ventilated Crawl Spaces
Features :
- Radon ventilation fan for ventilated crawl spaces
- Effective for diluting low levels of radon
- 220 CFM, 40 watt matainance free exhaust fans
- Faceplate is sized for ventilation openings through standard block foundations
Additional Info :
This tjernlund rv2 radon fan is ideal for crawl spaces that don’t have a window or door to allow for ventilation. It’s designed to be installed on the inside of the crawl space, and it comes with a flashing to help prevent moisture buildup. The fan is certified by the EPA to reduce radon levels in homes up to 4,000 square feet. The fan is rated to pull in 1,100 cubic feet of air per minute, and it’s designed to be energy efficient.
It only draws 0. 3 amps of electricity, and it has a programmable timer that can be set to run for 1, 2, 4, or 8 hours per day.
9. Abestorm Crawlspace Ventilation Fan with Humidistat, Basement Crawlspace Vent Fans with Dehumidistat & Freeze Protection Thermostat, Dual Air Vent Fan for Crawlspace/Basement/Kitchen (220 CFM Airflow)
Features :
- 【Crawl Space Basement Ventilator Fans】: Airflow: 220CFM. Size: 18″ x9″ x2″. This crawlspace/basement vent fan is designed to ventilate out odors and pollutants, while reducing humidity levels to prevent mold in your crawl space and basement.
- 【Built-in Dehumidistat & Freeze Protection Thermostat】: Operating humidity: 20%-80%RH. This crawlspace vent fan with humidistat features Durable Stubborn Aluminum Zinc Shell, Freeze Protection Thermostat, ideal for work in a humidity and a low-temp environment, don’t worry it rust.
- 【Powerful But Quiet Fan Booster Motor】: <48dba noise. This register booster fan features durable centrifugal blades and ball bearing motor, cools and ventilates areas with its powerful airflow.
- 【Easy-to-Operate Vent Fan】: Features knob control panel, easy to set time for running. Just plug it in, set it and forget it. Easy to exhaust vent radon gas, treated wood gases and odors, prevents migrating into living areas.
- 【Best Gift For Your House】: Let this ventilator fan be the best helper for your house. Dual fans ventilator with exhaust and intake, designed to control the temperature and humidity levels of your crawlspace, basement, attic, and garage, Increases air circulation to protect home and occupants.
- ✔ 12-month warranty and professional amazon after-sale service. Any question about your vent fans, please feel free to contact us at emails, our customer support team will reply to you within 24 hours.
Additional Info :
| Item Dimensions | |
| Height | 9.06 |
| Width | 1.77 |
| Length | 18.11 |
This is a great product for those looking for a fan that has a humidistat, freeze protection thermostat, and dehumidistat with a decent amount of power. This product is easy to install, and the only thing you will need to buy is the 6 inches plastic ducting and screws to install it. Also, this product is UL and cUL listed, and meets the national electrical code. For the humidistat, it has a humidity range of 40% to 90%, and the dehumidistat has a range of 50% to 80%.
Also, the fan has a 3-speed option. This means that you can adjust the fan speed; high, medium, and low.
10. Abestorm 540CFM IP-55 Rated Crawlspace Ventilation Fan with Humidistat & Thermostat, 8.7inch Basement Vent Fans with Isolation Mesh, Ventilator Fan for Crawl Space Basement Garage Attic Grow Tent
Features :
- 🍃【Crawlspace & Basement & Garage & Attic Ventilation Fan】Airflow: 540CFM, Ventilation type: Air out. With this exhaust fan, you can exchange the outdoor and indoor air, improve room air quality and balance the humidity. Use crawl space vent fan to change your crawl space from low-speed passive ventilation to efficient active ventilation.
- 🍃【Built-in Dehumidistat & Freeze Protection Thermostat】Operating humidity: 5%-80%RH, this High-Flow Powered Ventilator Fan will turn ON/OFF automatically with SET humidity % level. Auto stop working when the outdoor temperature is lower than 35°F/3°C. This vent fan will help reduce moisture in crawl space / foundation / basement to protect the structure of the house and the health of its occupants.
- 🍃【Built-in Isolation Mesh & IP-55 Rated】5.5mm Isolation Mesh prevents reptiles from gaining access to the crawl space; Solid-Built Aluminum Zinc Shell with IP-55 rating, highly resistant to liquids and dust, higher weather-proof, makes it ideal for work in a humid environment with a long service life, don’t worry it rust. Maintenance free crawlspace fan helps increase air circulation to protect damp areas from condensation and wood rot.
- 🍃【Easy to Install & Operate Vent Fan】Overall Size: 15″x 2.8″ x 10.2″, 8.7 inch fan with 6 foot grounded power cord. Faceplate can be trimmed to meet your different installation needs. Features simply knob control panel, easy to set humidity for running. Just plug it in, set it and forget it. Constant operation helps vent radon gas, treated wood gases and unpleasant odors, prevents seeping into living space.
- 🍃【Quality Service and Warranty, Buy Worry-free】Abestorm crawlspace ventilation fan is fully compliant with electrical safety ETL. Every Abestorm crawl space fan comes with a 2-year warranty. Moreover, we established a professional technical support communication center. You can call us directly, ready to assist you.
Additional Info :
| Item Dimensions | |
| Height | 10.2 |
| Width | 15 |
| Length | 2.8 |
The Abestorm 540 CFM fan is a great option for those looking for a high-quality, mid-range priced ventilator for their basement, garage, attic, or grow tent. This well-designed fan is IP-55 rated, which means it will be protected from debris and water jets from any angle. It also has a built-in humidistat and thermostat, so you can set the fan to only turn on when the humidity in the space rises above your desired levels.
The fan is rated at 540 CFM and uses a standard 3-prong outlet. This unit is a great option for those looking for a balance of features, quality, and price.
Best tjernlund underaire crawl space ventilator You Are Looking For
When searching for a crawl space ventilator, there are a few key features to look for.
Ventilator Capacity
The ventilator capacity refers to how many cubic feet per minute (CFM) of air the unit can effectively remove from a crawl space. Generally, the larger the home and crawl space, the higher the capacity ventilator you will need.
If you have a small crawl space that’s only 200 square feet, a ventilator with a capacity of 100 CFM should be sufficient. On the other hand, if your home is 3,000 square feet with a crawl space that’s 500 square feet, a ventilator with a capacity of at least 250 CFM is recommended.
Duct Options
Most ventilators will include ducts which allow you to connect the unit to an existing duct system or ventilate a particular area.
If your home already has ducts installed, it’s often easier and less expensive to choose a ventilator with built-in ducts.
Duct size varies, depending on the ducting options of your chosen ventilator. For example, a duct size of 6-inch may be sufficient for your needs, while a duct size of 12-inch may be required.
Noise Level
The noise level of a crawl space ventilator is measured in sones. The lower the sone number, the quieter the ventilator.
A crawl space ventilator with a sone rating of less than 1 is considered whisper-quiet. If you’re concerned about noise being an issue in your home, a whisper-quiet ventilator may be the best choice for you.
Auto Shutoff
An auto shutoff feature allows the ventilator to turn off if it’s overloaded or if there’s a problem with the ductwork or ducts. An auto shutoff feature ensures the ventilator is safe to use and reduces the risk of fire.
Crawl Space Ventilator Installation
Before you purchase a crawl space ventilator, you’ll need to decide if you’ll be able to install the unit yourself or if you’ll need to hire a professional to do the installation for you.
If you’re comfortable installing HVAC equipment and you have sufficient experience doing so, you may be able to install the ventilator yourself.
On the other hand, if you’re
People Also Ask (FAQs)
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How does the TJernlund CAV-20 Under-Aire crawl space ventilator work?
The TJernlund CAV-20 Under-Aire crawl space ventilator is a fan that pulls air out of the crawl space and pushes it through a duct. The duct is usually installed in a soffit or a ridge vent.
Because the duct is in the attic, it can be installed using a relatively small hole, usually in the attic floor.
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How do you install an under-a-ire crawl space ventilator?
The first step to installing an under-a-house crawl space ventilator is to prepare the space for the installation by removing the existing dirt floor, insulation and ductwork. Next, secure the metal crawl space ventilator to the bottom of the house with the attached metal brackets.
You will then need to run the flexible ducting to the side of the house where it will connect to an exterior wall vent.
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Does the TJernlund CAV-20 Under-Aire have a fan?
Yes, the CAV-20 Under-Aire does have a fan. It is a very quiet fan, so you may not even hear it running.
The installation manual states that it is normal for the fan to be on during the heat mode, but it will not run during the cool mode.
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Is the TJernlund CAV-20 Under-Aire a good crawl space ventilator?
TJernlund’s CAV-20 Under-Aire is a high quality crawl space ventilator that can be installed in both new and existing homes. This ventilator is easy to install, and the only tool you will need to install it is a drill.
This crawl space ventilator features a UL-listed blower, and the motor is covered by a 5 year warranty.
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Is the TJernlund CAV-20 Under-Aire a whole house fan?
No, the TJernlund CAV-20 Under-Aire is not a whole house fan. It is a whole house fan kit. You must already have a whole house fan installed.
Is the TJernlund CAV-20 Under-Aire a blower or a fan The TJernlund CAV-20 Under-Aire is a fan.
Conclusion
The key to picking a good crawl space ventilator is knowing exactly what your crawl space needs and what your budget is. With that in mind, the best overall Crawl Space Ventilator is the TJERNLUND UnderAire 2000. It is designed to handle homes up to 3,000 square feet and features an easy installation. The Homewerks HWE-320-4 Crawl Space Ventilator is a close second.
It has a low price tag but still offers great air circulation and moisture removal for smaller crawl spaces. If you are looking for something for a larger home, the Amseco Crawl Space Ventaltor is an excellent choice.