Keeps weather out
The gravity damper only opens while exhaust air is moving. As soon as the dryer or bath fan shuts off, it drops closed again, which helps keep wind, rain, and cold air out of the duct.
Soffit Dryer Vent with Damper, 4 in Under-Eave Exhaust Vent for Dryer and Bath Fan, Paintable Plastic, White, Lambro 143W
A paintable 4 in soffit vent with a self-closing damper for dryer and bath fan exhaust.
$8.99$11.99CurbGo Savings: Save $3
- 4 in duct opening
- 11 sq in airflow
- Self-closing damper
- UV inhibitor added
- Paintable plastic
Estimated arrival
Enter your ZIP for a delivery date
Ships to the lower 48 states with tracking.
Why buy from CurbGo
- Risk-free 30-day returnsUnused, in the original packaging
- U.S.-based home goods retailerReal U.S.-based support, before and after
A clean, low-profile exit for exhaust air tucked up under the roofline
At a Glance
- 4 in opening: sized for standard 4 in duct
- Gravity damper: stays shut when the fan or dryer is off
- 11 sq in: net free airflow area
- UV inhibitor: helps resist premature fading
- Paintable: prep and use plastic paint
Not every house has a convenient wall for a dryer or bath fan vent, so many run their exhaust out through the soffit instead. The Lambro 143W is a white plastic under-eave vent made for that job. It mounts over an existing 4 in opening, and its gravity damper swings open when exhaust air pushes through, then falls shut to keep wind and weather out when the airflow stops. A caulk-friendly frame and UV-protected resin help it stay neat on the trim.
Key Features
- Gravity damper: opens under exhaust pressure and closes on its own when the airflow stops.
- Soffit mounting: designed to sit flat under the eave where the duct exits.
- Dryer or bath fan: recommended for clothes dryer exhaust and bathroom fan exhaust.
- Caulk-friendly frame: four accessible screw holes and a flat frame make sealing easy.
- UV-protected resin: polymer resin with a UV inhibitor helps prevent premature fading.
- Paint to match: prep the surface and use plastic paint to blend with your trim.
- No screen to clog: 11 sq in of net free area lets exhaust pass straight through.
What's Included
In the box: one Lambro 143W white plastic soffit vent with a built-in damper. Installation screws are not included.
Before You Buy
- It fits a 4 in duct opening. The vent mounts over an existing 4 in opening. Other duct sizes need a different vent.
- It is built for soffit installs. Mount it under the eave, and check your local building code before routing dryer exhaust through a soffit.
- Screws are not included. Pick up exterior screws suited to your soffit material, plus exterior caulk for the frame.
- It has a short 1.4 in collar. There is no long tail pipe, so the duct needs to reach the soffit opening.
Perfect For
- Dryer runs that exit through the eaves
- Bathroom fans vented through the soffit
- Replacing a cracked or stuck soffit vent
- Homes where a sidewall vent is not practical
- Painting to match white or colored trim
Care & Use
- When used with a dryer, check inside the vent regularly for lint buildup.
- Make sure the damper swings freely and closes fully after each use.
- Clean the frame with mild soap and water.
- To repaint, prep the surface first and use a paint made for plastic.
Shipping
Your order is packed with care and tracked door to door. Ships fast from CurbGo with tracking.
Why vent through the soffit
Blends into the trim
A low-profile white frame sits neatly under the eave, and the polymer resin takes plastic paint after a little prep, so you can match it to colored soffits and fascia on any house.
Easy to install and seal
Four accessible screw holes and a caulk-friendly frame make mounting over an existing 4 inch opening simple, whether you are replacing a tired old vent or finishing a brand new exhaust run.
The vent at a glance
Sized for standard 4 in dryer and bath fan duct.
4 in
Duct opening
11 sq in
Net free area
1.4 in
Collar length
How does a soffit vent with a damper compare?
vs. an open soffit grille
A plain grille leaves the duct open to wind and cold. The 143W damper shuts whenever the exhaust stops.
vs. a sidewall vent hood
A wall hood needs a clear path to an exterior wall. A soffit vent lets the duct exit under the eaves instead.
vs. a vent with a bug screen
Screens can trap lint and need regular clearing. The 143W has no screen, so exhaust flows straight past the damper.
Fits your soffit
A slim vent that mounts under the eave over a 4 in duct.
- Duct opening
- 4 in
- Frame width
- 5 3/4 in
- Collar
- 1.4 in
- The 5 3/4 in frame needs a flat soffit surface for screws and caulk.
- Run the 4 in duct right up to the soffit opening so the short collar can connect.
Full Specifications
Every detail, measured and listed
| Brand | Lambro |
|---|---|
| Model | 143W |
| Type | Plastic soffit (under-eave) exhaust vent with damper |
| Duct size | 4 in |
| Collar | 1.4 in |
| Frame width | 5 3/4 in |
| Damper | Gravity |
| Net free area | 11 sq in |
| Screen | None |
| Material | Polymer resin with UV inhibitor |
| Color | White, paintable |
| Mounting | 4 screw holes, caulk-friendly frame |
| Use | Clothes dryer and bath fan exhaust |
| Screws | Not included |
| MPN | 143W |
FAQs
Common questions that customers ask
Can I use a soffit vent for a dryer?
The Lambro 143W is recommended for clothes dryer and bath fan exhaust. Check inside it regularly for lint, and confirm your local building code allows soffit dryer venting.
What size duct does the Lambro 143W fit?
It mounts over an existing 4 in opening and has a 1.4 in collar.
Does it come with screws?
No. The frame has four screw holes, but installation screws are sold separately.
Can I paint a plastic soffit vent?
Yes. Prep the surface first and use a paint made for plastic.
How fast will it ship and can I return it?
Orders ship to the 48 contiguous states and process within 2 business days. If it is not right, you have 30 days from delivery to return unused items in the original packaging.
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CurbGo hunts for the well-made version of everyday things and skips the markup. Lambro has made venting parts for American homes for decades, from dryer hoods to duct connectors. The 143W shows that focus: a simple self-closing damper, a frame that is easy to caulk, and resin built to handle years of sun under the eaves.
Give your soffit a clean exhaust exit
Fast shipping. 30-day returns. A 4 in vent with a self-closing damper.
