bing tracking image
  1. RV Vents and Fans
  2. Redline
  3. Vent
  4. Wall Vent
  5. No Fan
  6. 6W x 8L Inch
2-Piece Exterior Wall Vent for Enclosed Trailers - Polypropylene - 3" Diameter Hole - Black

2-Piece Exterior Wall Vent for Enclosed Trailers - Polypropylene - 3" Diameter Hole - Black

Item # HMAV2-AVT2
Our Price: $23.75
RV Vents and Fans
Shipping Weight: 0.35 lbs
Add to cart
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
This 2-piece vent provides an inexpensive yet attractive way to ventilate your enclosed trailer. Round interior vent and half-moon-shape exterior piece are both constructed of black, UV-resistant polypropylene plastic that holds up to sun exposure. Great Prices for the best rv vents and fans from Redline. 2-Piece Exterior Wall Vent for Enclosed Trailers - Polypropylene - 3" Diameter Hole - Black part number HMAV2-AVT2 can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (207)
  • Q & A (0)
  • Photos

Redline RV Vents and Fans - HMAV2-AVT2

  • Vent
  • Wall Vent
  • No Fan
  • 6W x 8L Inch
  • Black
  • Redline
  • Plastic

This 2-piece vent provides an inexpensive yet attractive way to ventilate your enclosed trailer. Round interior vent and half-moon-shape exterior piece are both constructed of black, UV-resistant polypropylene plastic that holds up to sun exposure.


  • Affordable trailer vent provides continuous ventilation for your enclosed trailer
    • To increase ventilation, you can install more than 1 vent
  • 2-Piece design creates a low-profile vent that's attractive both inside and outside your trailer
  • Half-moon piece with flat, slotted side attaches to trailer's exterior
    • Slots are on one side only, allowing you to position the vent for best airflow and to help prevent water from getting in
    • Drain holes at the corners let out any water that does get in
  • Round, slotted interior piece installs inside your trailer
    • You can easily trim vent tube to fit thin walls
  • UV-resistant, polypropylene plastic construction stands up to the elements
  • Black color
  • 9 Screws and sealant (sold separately) required for installation


  • Fits 3" diameter hole in enclosed trailer
  • Exterior half-moon dimensions: 8" long x 6" tall x 1-1/4" thick
    • Flange width: 1/2"
  • Interior circular piece dimensions:
    • Diameter at flange: 4-1/8"
    • Vent tube outside diameter: 2-15/16"
    • Tube depth: 1-1/2"
    • Flange width: 5/8"

HMAV2-AVT2 Alliance 2-Piece Enclosed Trailer Vent - UV Resistant Polypropylene Plastic - Black

Customer Satisfaction Score:

Customer Reviews

2-Piece Exterior Wall Vent for Enclosed Trailers - Polypropylene - 3" Diameter Hole - Black - HMAV2-AVT2

Average Customer Rating:  4.8 out of 5 stars   (207 Customer Reviews)

This 2-piece vent provides an inexpensive yet attractive way to ventilate your enclosed trailer. Round interior vent and half-moon-shape exterior piece are both constructed of black, UV-resistant polypropylene plastic that holds up to sun exposure.


Excellent product and easy to work with. Great service.

I was concerned however about insects entering through the vents so came up with a filtration system.

Used a PVC coupling and some filter material. Cut the coupling to 1/2 inch rings and remove just enough material to allow an inside press fit. Cut round filter and insert first then hold in place with the ring.

On the outside vent cut a long narrow piece as shown.

When installed as shown, adds very good double filter and allows air to move freely. Just finished a 6000 mile trip clear across the country and back and filter performed perfectly. Eliminating the heat build up AND keeping the bugs out.

JIM : ]

Herb L.


I really like this idea and thanks for taking the time to document and post this info. What is the blue filter material, where did you find that and how is it secured to the external vent piece?Best regards.


Product worked but wasn't worth the price paid. Ordered the white version which was cheaper and combined with other items for free shipping. Ordered 11/23; Kept changing the delivery till July 2024. You offered the black vents. Charged the higher price and also charged me freight. Turned me off as a customer by bait and switch. Forced me to find a better source for components.


Another review (above) recommended using a plywood jig. I took their advice and was glad I did. They did not include images, so I am. It made the install SUPER easy. 1) Use a scrap piece of 1/2 or 3/4" plywood slightly larger than the exterior vent. Find center of plywood and use 3" hole saw to make opening. Insert the round interior vent (loosely) from one side, and then loosely attach semi-circular exterior piece. Pinch all three pieces together and set on a flat surface. Trace the outline of the semi-circular vent onto the plywood. Make marks at the 6 screw hole openings. 2) Drill through plywood at the 6 screw openings. 3) locate vent position on exterior of trailer (note: make sure the shape of the vent corresponds to the flow of air!!!). 4) place plywood jig at desired loaction (press against exterior of trailer) and drive at least 4 self-tapping screws through plywood and into trailer wall (make sure to use screws long enough to penetrate thickness of plywood). 5) now that plywood is attached to exterior of trailer, use a hole saw to cut through metal and plywood interior wall. The jig will keep your saw in perfect path. 6) Apply silicon to inner rim of 3" round interior vent cover. Press into opening. 7) My interior vent was the perfect depth - It was flush with exterior of trailer wall. If yours is too long, cut to proper depth. Apply silicon at seam where metal opening meets end of interior vent (added protection against rain). 8) Add silicon bead on underside of exterior vent flange. Align with screw holes (from jig attachment) and drive 6 self-tapping screws. Good luck!


My 5x8 enclosed trailer was overheating due to no arrangements for ventilation. I added the 2-piece polypropylene trailer vents along with a rooftop solar powered plumbing vent and my problem was solved. The inside of the trailer temperature remains pretty much close to ambient temperature


The vents were exactly what I needed to vent the kitchen of my home-built teardrop camper.


We use these in all of our trailers, they work just fine, we have had no issues with them. They just provide a little extra ventilation. We use them as a wall vent with lots of silicone behind the screws, and have had no issues with water infiltration or insects. One of our go-to products.


We use these on every trailer we make, very good heavy duty vent, attractive, adds a design element to the trailers. We use both black and white vents, depending on the side color of the trailer. Yes, we are kind of trailer nerds! And we do love e-trailer!


No mounting screws

Etrailer Expert

Katrina B.


This vent does not come with screws or sealant, which are required for installation. We do sell the sel-tapping screws and sealant. For self-tapping screws the part # 31071 would work great and then for sealant part # 0160297 will work.


Like most items from here they came on time. The vents were easy to install and the how to video helped with the installation. The only thing is I wish it came with the sealant and screws but that might not work on all applications. I installed a couple more screws on the sides to match the contour of the wall.


We use two of these vents on every trailer that we make, and are nothing but happy with the condition, the price and the functionality of it. Such a simple concept that just works so well for some additional ventilation.


I’ll have to modify the part for airflo w.


Those parts that we purchase from etrailer always arrive as advertised and in a timely manner. The parts (we are a teardrop trailer manufacturer, and are notoriously hard to please!) are sturdy and well made. Have never had an issue with this company in the four years we have used them as one of our suppliers.


Works very well for the vent fan on an Air Head composting toilet, installed in a Nucamp Tab 400 travel trailer.


Just finished installing my new vents, very easy to install and look pretty good as well, hopefully they serve they're purpose.
Any ventilation is better than none.


The product is constructed very well and after watching the video to install in my trailer, looks fairly simple to install.



Still working and providing air flow into the trailer.


I needed a rainproof vent for an outdoor electrical equipment box (WiFi). This item fit the bill perfectly. It's mounted on outside of box and an exhaust fan is mounted over the 3" hole on inside. Only used the interior vent as a guide to line up exterior part with 3" hole.

Glad I ran across this item while searching for a vent and eTrailer gave quick shipment.

Joel N.


I am looking to ventilate a fiberglass camper shell, especially to reduce interior condensation from breath while sleeping in cold andor rainy weather.Rather than a roof vent, I want a vent like this, or the louvered vent, and a small 12 volt fan attached. I imagine it mounted on a vertical wall of the camper shell, not the roof.Can you please describe in greater detail the exhaust fan you mounted over the 3 hole inside? Even if not a 12 volt fan, I would like to see the fan, as I may be able to find a 12 volt version.



I used a small Box Fan 3. Google Box Fan 3IN and youll get lots of hits. They come in various voltage ratings. I used 110vac, 12vdc, and 5vdc fans depending on what was available. Be advised these small fans do not move a lot of air for a camper.One thing to consider for camper installation is dust. There is no shutoff on these vents. Ive found travelling on dirt roads sucks in dust through any open holes.I had a camper problem just like yours. My solution was to spray the interior walls with a simulated fabric spray. Dont recall brand or where I got it. However it stopped getting rained on when sleeping inside. Some sort of vent is also desirable. It must be rain proof and close off for dust protection.



Vent is holding up well after 1 year in AZ sun.


The outside finish has witness marks from the molding process. I’m sure it will work good. Low score for finish


Good product, easy installation and good price.


Exactly what I need to remove heat and fumes while traveling.


Installed these vents in a new enclosed trailer that only offered the overhead vent. I couldn't leave that vent open during bad weather. Using this trailer as transportation as well as storage. Motorcycle requires venting and HMAV2-AVT2 was a snap to install.

Scotty B.


Outstanding, looks new.


purchased a 5x10 enclosed cargo and will be installing 4 vents that are at a great price and will keep my trailer at a lot cooler temp, Thank You etrailer for the speedy shipping, and great parts.

Rigo V.


Hello George i purchased 4 of them, front part of trailer i mounted 1 each side high and rear 1 mounted low each side , we left FW TX and drove to Tigard Oregon and kept the inside of that trailer very cool we don’t have the trailer any more but our next trailer will have the same ones mounted on its walls, thanks for the txt george great product great price...


No complaints. I'm not sure how efficient the air transfer it through this vent, but it was easy enough to install, and has been water tight. It's installed to vent my battery compartment through the rear of my teardrop trailer.

Dan G.


Still no complaints. Almost had a bear test its durability while camping in tahoe, but chased it away before it investigated too closely.


Not so Impressed. There doesn't seem to be much better airflow in my trailer. I installed 4 vents. The way the product is designed seems to block air from coming instead of letting it flow.



They dont seem to help much at all to be honest. 4 vents and still hot in the trailer.


Seem to be well made and installed easi ly.


I installed a pair of the vents at the top rear of an insulated 24ft car hauler. Simple to installed using a highly recommended hole saw. The purpose was to create some natural convective updraft keeping it dry, cooler, and ventilated when using it for long term storage. The provided screws were replaced with Stainless to avoid future rust bleed. There is no gasket provided for the exterior and although it may not be necessary to avoid rain finding its way into the interior, one was improvised using some strip seals (like sticky gum) around all but the bottom so any water could drain. They seemed a bit restrictive for free air flow where the cylindrical shell interfaces the rain guard inside the outer cover. This is necessary to the design for universal left or right installation, but knowing where they be installed allowed the guard to be trimmed up to just below horizontal with out effecting the rain protection. They worked out good, although I would have like to see the available in 4" and 6" sizes.

Show More Reviews

See what our Experts say about this Redline RV Vents and Fans

< Previous

Do you have a question about this RV Vents and Fan?

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Robert G
Expert Research:
Robert G
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Expert Research:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Raymond P
Written by:
Raymond P
Employee Cole B
Installed by:
Cole B
Employee Jacob H
Installed by:
Jacob H
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Eric H
Updated by:
Eric H

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-800-940-8924