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.

ASIN	B077HJMJ7T
ASIN	B077HJMJ7T
Batteries Included?	No
Batteries Required?	No
Color	White
Customer Reviews	4.6 4.6 out of 5 stars (521)
Customer reviews	4.6 4.6 out of 5 stars (521)
Date First Available	21 May 2018
Date First Available	21 May 2018
Included components	Mesh, Vent
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	236 g
Item model number	PI024
Item model number	PI024
Manufacturer	Hon&Guan
Manufacturer	Hon&Guan
Material	ABS
Part number	BY150
Product Dimensions	20.98 x 20.98 x 7.49 cm; 235.87 g
Product Dimensions	20.98 x 20.98 x 7.49 cm; 235.87 g
Size	6 Inch

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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