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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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）

Product ID: 63712588

🦟Built-in fine mesh fly screen

🌬️6-inch (150mm) optimized airflow

🛡️Durable ABS construction

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Description

🌟 Elevate your airflow game with sleek, secure ventilation!

LEAK PROOF SEAL - Weather seal prevents drafts and unwanted leaks, enhancing energy efficiency
EASY MAINTENANCE - Detachable panel and sleeves for effortless cleaning
VERSATILE MOUNTING - Wall or ceiling installation for bathroom, office, or home use
INTEGRATED FLY SCREEN - Keeps pests out while maintaining smooth ventilation
PREMIUM ABS DURABILITY - Engineered for long-lasting, weather-resistant performance

The Hon&Guan 6'' Soffit Vent features a robust ABS build with a 150mm diameter for optimal airflow. Its built-in fine mesh fly screen protects your space from insects, while the detachable design ensures easy cleaning. Suitable for wall or ceiling mounting, it’s perfect for bathrooms, offices, and homes seeking efficient, draft-free ventilation.

Specifications

ASIN	B077HJMJ7T
Best Sellers Rank	#12,218 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #4 in Soffit Vents
Color	White
Customer Reviews	4.6 4.6 out of 5 stars (1,764)
Date First Available	November 15, 2017
Included Components	Mesh, Vent
Item Package Quantity	1
Item Weight	8.3 ounces
Item model number	PI024
Manufacturer	Hon&Guan
Material	ABS
Part Number	BY150
Product Dimensions	8.26 x 8.26 x 2.95 inches
Size	6 Inch

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$40.06

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In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to British Virgin Islands.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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