Will this with work with an aluminum storm door?

It could be used but would require. Framing the the cat door with 1x2 or something similar. I installed mine 5/8 siding and had to put a wood frame around it after inserting it in the hole I cut in the door. It is made for fitting on an 1 1/2 inch thick door. Hope this explanation helps it requires some extra work but mine works fine.

Can you remove the magnet?

I attempted to remove the magnets but stopped once I realized that the magnets seemed to be either built into the actual unit and covered by the rubber seal and/or the magnet is embedded in the bottom of the frame and trying to remove it would damage the overall integrity of the frame and flap.

When both entries are closed, how much noise reduction/deafening is there? i.e. will it be much help at keeping outside noise outside of the room?

When installed properly, outside noise does not noticeably increase in my experience.

How do i remove the flap?

The flap/door is not removable unless you break the tabs that hold the door to the frame (this may end up damaging the frame). I have used masking tape to hold the door open when necessary.

ASIN	B01JU5CWDS
Best Sellers Rank	#3,133 in Pet Supplies ( See Top 100 in Pet Supplies ) #1 in Cat Doors
Customer Reviews	4.4 4.4 out of 5 stars (13,542)
Date First Available	August 6, 2016
Dog Breed Size	Extra Small
Frame Material	Plastic
Is Discontinued By Manufacturer	No
Item Weight	9.9 ounces
Item model number	M031
Manufacturer	Depets
Minimum compatible thickness	2 Inches
Product Dimensions	7.5 x 2 x 7.8 inches
UPC	713831805330
Weight Limit	16 Pounds

Depets Medium Cat Flap Door with 4 Way Lock (Outer Size 7.5" x 7.8"), Magnetic Pet Door Kit White, Weather-Resistant Cat Door for Cats & Doggy

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