How does this attach to the hole I will cut into my aluminum soffit?

There are screw holes in the flange of the inner (black) piece. You will screw the black piece into the material surrounding the hole. The white louvered cover will conceal the screws when installed. FYI, I found that the perforations on the white cover were so small that not enough air could get through, so I cut that out leaving only the louvers in place. Now the fan can do its job because the air can flow through.

how to install this through the 1" thick drywall ceiling?

Use a circle cutter for sheetrock (Home Depot, Lowes, Ace etc.) and screws through the flange of the inner black section. May need to use cavity fasteners.

What is the flow direction, into the grill or out of the grill?

The grill is used with vent duct to exit outside the structure so flow is from inside out. The grill is to prevent critters and birds from getting into your house.

can anyone tell me exact inside and outside diameter?

inside diameter is 2.83 inch. outside diameter is 4.53 inch

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🌀 Elevate your airflow game—vent smarter, live fresher!

BUILT IN PEST DEFENSE - Fine mesh fly screen keeps insects out while maintaining fresh airflow—no more unwanted guests.
WEATHER RESISTANT SEAL - Advanced weather seal prevents leaks and drafts, protecting your home year-round.
HASSLE FREE MAINTENANCE - Detachable panel and sleeve make cleaning and upkeep a breeze, saving you time and effort.
VERSATILE MOUNTING OPTIONS - Wall or ceiling installation adapts seamlessly to your space and ventilation needs.
EFFORTLESS VENTILATION UPGRADE - 6-inch round design ensures maximum air circulation for bathrooms, offices, and living spaces.

The Hon&Guan 6'' Soffit Vent features a durable ABS construction with a 150mm diameter and 77mm sleeve height, designed for efficient ventilation in bathrooms, offices, and homes. Equipped with a fine mesh fly screen and weather seal, it prevents pests and drafts while offering easy maintenance through detachable components. Certified for safety and quality, this vent combines functionality with sleek, versatile installation options.

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Manufacturer	Hon&Guan
Part Number	BY150
Product Dimensions	20.98 x 20.98 x 7.49 cm; 235.87 g
Item model number	PI024
Size	6 inch
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Item Weight	236 g

Hon&Guan 6'' Soffit Vent Exhaust Vent, 6 Inch Round Air Vent Dryer Vent Soffit with Built-in a Fly Screen for Bathroom Office Home(150mm）

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