What does the a, b, c numbers mean? measurements in what?

The sizes in the picture are all in in millimeters. 25 mm equals about 1 inch so the size 75 is 3 inch, the size 100 is 4 inch and so on. The size 150 is the 6 inch vent. A=8.26in B=3.15in C=5.6in

Does it have a fly screen? Several reviewers said that it doesn't come with the screen.

There is a white plastic screen inside it. I don't remember how big the openings in the screen were as I used it inside and discarded the screen before I installed it.

Is it adjustable? Can air flow be completely shut off?

No, it isn't adjustable, and you can't shut off airflow. Why would you want to?

How does it “freely” come apart? It has to so the screen can be cleaned. It won’t budge pulling and twisting.

This slips on. Mine points downward at a 45 so I had to put a drop of silicone on it to keep in from sliding off.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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HG Power 3 Inch Round Air Vent, ABS Louver Grille Cover with Built-in Screen Mesh, White Soffit Vent for Bathroom Office Kitchen Ventilation - Opening Size 2.83"

Product ID: 59776679

🧼Detachable panel for easy cleaning

♻️Durable, eco-friendly ABS material

🛠️3-inch diameter for versatile fit

¥2756

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌬️ Elevate your airflow game with style and ease!

BUILT IN SCREEN MESH - Keeps pests out while ensuring optimal airflow
SLEEK MODERN DESIGN - White finish complements any bathroom, kitchen, or office space
EFFORTLESS INSTALLATION - Wall or ceiling mount options for seamless setup
HASSLE FREE MAINTENANCE - Removable panel makes cleaning a breeze—stay fresh effortlessly
TRUSTED QUALITY SUPPORT - Top-rated with 4.5 stars and responsive 24-hour customer service

The HG Power 3 Inch Round Air Vent features a durable, eco-friendly ABS construction with a built-in screen mesh to prevent pests. Its 3-inch diameter fits standard openings, and the detachable white panel allows for easy cleaning. Designed for both wall and ceiling mounting, this vent is ideal for bathrooms, kitchens, and offices. Backed by a 4.5-star rating and responsive customer service, it combines functionality with modern aesthetics.

Specifications

ASIN	B078RM9T3S
Best Sellers Rank	#7,634 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Soffit Vents
Brand	HG Power
Customer Reviews	4.5 4.5 out of 5 stars (2,282)
Date First Available	January 2, 2018
Item Weight	2.82 ounces
Item model number	USPI021
Manufacturer	HG POWER
Manufacturer Part Number	USPI021
Model	YJHUS-PI021
Package Dimensions	4.57 x 4.45 x 2.99 inches
Special Features	Water Resistant
Voltage	110 volts

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