4 Inch Round Air Vent, HG Power Adjustable ABS Vent Cover, White Louver Grille Vent Fit for Bathroom, Office, Kitchen, Ventilation Use - Opening Size 3.74"

I purchased the HG POWER 8 Inch Soffit Vent (Round Air Vent Cover with Louver, White) for my ventilation setup, and it has worked out great. The opening size of 7.28" was a perfect fit, and installation was quick and easy. The adjustable louvers allow me to control airflow exactly how I need it, which makes it very versatile for different spaces like bathrooms, kitchens, and even greenhouse ventilation. The ABS plastic construction feels solid and durable—sturdy enough to last but still lightweight for easy handling. I especially like that it comes with a fly screen mesh, which helps keep dust and insects out while maintaining good airflow. The clean white design also blends in well with walls and ceilings, giving it a neat, finished look. ✅ Pros: Adjustable louvers let you control airflow direction and strength Durable ABS construction – strong but lightweight Built-in mesh screen keeps out bugs and debris Easy to install and fits standard openings (7.28") Works well for multiple applications – bathrooms, kitchens, living rooms, or even greenhouse setups ❌ Cons: The plastic finish is durable but may scratch if handled roughly White color only—could be limiting if you want it to match darker décor 💡 Tips: Double-check your opening size before ordering to ensure a perfect fit. If using in a greenhouse or miner setup, pair it with an inline fan (like AC Infinity) for maximum airflow. Regularly check the mesh screen for dust buildup—it’s easy to clean with a vacuum or quick rinse. For ceiling installations, make sure the louvers face the right direction for airflow efficiency. Bottom Line: This vent cover is a great combination of functionality and durability. It’s simple to install, easy to adjust, and blends seamlessly into most spaces while providing reliable airflow control. A great value for anyone upgrading their ventilation system.

Fit great, easy to install. Liked that the internal vents can be removed if you have no need to restrict the airflow. Very clean looking.

Works well in 4” round duct with plastic wings giving it a good fit. Adjustable air flow works well.

I bought two of these for my chicken coop. One to filter air going out to my air filter. One to return the air. These are wonderful because you can close up the vents or open as wide as you need. Cheap, and fit perfectly with my 4” dryer hose and connectors. Air flow is great, as I said, adjustable. As for cleaning, I just hit it with something and any blockage gets sucked through to the filter. lol

Easy twist to mount installation/no screws needed sleek clean appearance with open and shut nob in the center. Note; duct connection tube is less than 4" @ 3 & 13/16"

The friction tab fit was nice but after a few days the air force with the flow closed off pushed the register out and fell to the floor. I drilled three holes and mounted with white screws. The flange diameter is about 2" less than the original register but the ceiling was painted so not a huge problem. Purchased to shut off the air conditioning in the basement during the summer and will open in the fall.

Bought these for my 200 sqft cabin to add fresh air in. It's spray foamed, so I ddin't want to suffocate in the winter! I had been leery of adding vents due to extra heat loss, but these are just the ticket! They have a knob on the fron that you twist to open or close, and it's a little or a lot! You do have to add another end to it for the outside, and maybe a chunk of PVC tubing depending on your walls. It even has little "holding fins" on the sides to hold it in place in your hole, so be sure to twist them in the right direction when inserting. Only downside is they will be tricky to install with walls of a differing thickness (mine are 1" thick). Seem well made, nice quality plastic, an worth the money for sure. If you don't like the color, just lightly spray paint them ;) **Edited to add** I JUST installed these. not sure if I can post a link, but here is an amazon product that I bought to use on the outer wall with these: https://www.amazon.com/Deflecto-Dryer-Mouth-White-RVHAW4/dp/B00DM8L178/ref=psdc_13397451_t2_B073HH3ZGM I'm going to pull off the metal tube, I already sued a chunk of pvc inside the walls which I found in the plumbing section of my hardware store . . . fits inside this nicely and gives me JUST enough extensionthrough a 4" wall. A bit of clear silicone to attach the two and viola, there it is. looking forward to seeing how well they circulate air! If you use for a single room structure (cabin/shed) make sure to study airflow charts on various designs on curculation. I put one of mine 12" from the floor and the other aross the room in the loft wall, so air will flow down and up one sde to the other :)

I love this vent. Works great. And looks great