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💨 Keep your home fresh, dry, and pest-free with the vent that actually works!
The PreVent-It 4 Inch Soffit Vent features a patented design that directs over 95% of moist bathroom air away from your home’s soffit, preventing moisture damage, reducing HVAC costs, and improving indoor air quality. Made from durable, weather-resistant resin and including all installation hardware, it’s easy to install and maintain. Its built-in damper flap blocks pests and drafts, making it the smart, energy-efficient choice for bathroom exhaust ventilation up to 110 CFM. Proudly made in the USA.






| ASIN | B0C94LSV37 |
| Air Flow Capacity | 110 Cubic Feet Per Minute |
| Best Sellers Rank | #21,555 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #6 in Soffit Vents |
| Blade Material | Plastic |
| Brand Name | Lancaster Home Products |
| Collection Name | Bathroom,Home |
| Color | White |
| Control Method | Touch |
| Controller Type | Button Control |
| Customer Reviews | 4.6 4.6 out of 5 stars (295) |
| Electric Fan Design | Exhaust Fan |
| Finish Type | Painted |
| Included Components | 4 Screws (#8-15 x 1"), Soffit Vent |
| Indoor Outdoor Usage | Outdoor |
| Is Product Cordless | No |
| Item Dimensions D x W x H | 11.25"D x 7.85"W x 3.75"H |
| Item Type Name | Soffit Vent |
| Item Weight | 14.56 ounces |
| Main Power Connector Type | Standard Household Plug (e.g., Type A, Type B) |
| Manufacturer | Novelty Manufacturing Co. |
| Material | Plastic |
| Model Name | PreVent-It Bathroom Soffit Vent |
| Model Number | 42502.01 |
| Mounting Type | Roof Mount |
| Number of Power Levels | 1 |
| Number of Speeds | 10 |
| Power Source | Corded Electric |
| Recommended Uses For Product | Exhausting Bathroom Fan, Ventilating |
| Room Type | Bathroom |
| Special Features | Built-in damper/flap provides a closed system, Easy to install & screws included, High-quality, durable resin plastic that's weather resistant, Made in USA, Patented design better ventilates bathroom exhaust |
| Standby Power Shutoff | High Efficiency |
| Style | 4" Soffit Vent |
| Switch Type | Push Button |
| UPC | 026978425027 |
| Unit Count | 1.00 Count |
T**.
A good choice.
A well made and sturdy vent. Build in baffle prevents drafts from entering. Looks good and functions perfectly. Very easy to install. The unit is a little large but I had the room for it. Ended up looking great. Very pleased.
J**.
Glad I found this!
Works great to push the air away from soffit. Matches my black soffit. easy to install. I have a 2 ft overhang, so this works and if ice icicles do form, there is room so it doesn't block the vent
S**.
Perfect solution!
Well made and great design to stop replacing cheap products often. The vent design is genius, has a damper and small vent holes to keep out bugs. Made of durable plastic and easy to install even 19’ in the air above second floor. Install two a couple feet apart to replace rusted metal “rust proof” after less than two years. Look no further for the best soffit vent on the market.
B**E
Worked as expected - question door flap
Best unit I was able to find that checks all the boxes I needed. Installed as expected. An unexpected “like” is the front nozzle can be removed separately to allow inspection and clean-out if needed (vendor should highlight this in a photo). My only issue is the door flap uses plastic integrated pins (like a dryer exhaust vent flap) which I question for long-term strength. Be sure to mount flat as any stress will bend the flap area and not allow it to move freely.
P**L
Pricey vent, but works good!
Nice vent! Very pricey for a plastic vent, but it did do the job!
O**R
Great product.!
Worked as it should, solid build quality and worth the money. It fit the vent hose for my aftermarket bathroom fan and looks better than expected mounted on the soffit. I would recommend and buy again if needed.
M**M
Well designed, well made and very sturdy
Look at my picture, you can see the unit is made of extra thick plastic and very sturdy. The collar connect to the flexible pipe is more than 1 in long, made it very easy to secure with the flexible pipe. The bottom is not flat but in V shape, moisture inside the housing will flow to a small weep hole
M**N
Great
We were looking everywhere for an easy to mount soffit vent for our bathroom fan. This worked great.
S**K
This vent was easy to install and delivers on the promise of a good ventilation solution. It is also a very robustly built. Highly recommended.
C**E
The design is very effective and as far as I know there is nothing like this in the UK market. However this is ridiculously over priced for what is a cheap plastic product. There is a back draft flap but I'm not convinced it will be either robust or effective - the fit is poor and for the price there should be zero friction at the pivot point.
K**H
Great product and easy to install.
V**2
Good idea but it's not well done... the anti back draft system can get stuck half way.
T**H
Pretty simple and as advertised. It is really the only design that prevents moist air entering the soffit and going up into the attic. My understanding is that bathroom vents shouldn't be vented from the soffit, but preferably from the roof. In my case, the existing vent was out of the soffit and upon inspection of the attic, I noticed mold forming on the attic OSB, between the two trusses where the vent is, and most notably closest to the soffit. The shower for the bathroom in question didn't have working cold water for quite some time, so the hot water-only showers likely exacerbated the issue. Either way, although I fixed the cold water to the shower, I still preferred to install this as opposed to any other soffit exhaust vent and did this for both bathrooms.
Trustpilot
2 weeks ago
1 month ago