could a mouse chew through this?

I think not easily or quickly. Rodent teeth are capable of amazing feats! When I was trying to be a hamster parent, I was advised by someone more experienced NOT to use wire mesh for the enclosure, because given enough time they would chew through. Plexiglass was recommended & it did not get chewed. (The edges were not accessible to hamster - only the flat surfaces. I think the wire would be fine as a top cover. This is a pretty sturdy mesh.

Will this stick to magnet ?

No. I just checked and a magnet will not stick to it.

Can we use this in aquarium without hurting fish?

Depending on how how you intend to use it? I installed a piece in my small aquarium to block the baby fish from being siphoned into the filter intake. The screen is on the inside of the filter where the fish do not come in contact with the screen. Seems to work fine. The screen has discolored to brown from being in the tank water. The fish are doing well. It has been about a month.

Can I use it as the airflow?

Of course, the mesh is quite good. Over time, it will get clogged with lint.You can use something to clean it, would be fine.

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Valchoose 1

Product ID: 683201051

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Details

Material
Stainless 304
Brand
Valchoose
Item dimensions L x W x H
27.9 x 27.9 x
Colour
Silver
Shape
Round

📏20 Mesh, 1mm Aperture - Precision Protection

📦3-Pack 11”x11” Sheets - Ready for Multi-Use

🛡️304 Stainless Steel - Rustproof Strength

Description

🛠️ Elevate Your Space with Steel Mesh That Means Business

SAFETY FIRST - Sharp edges require gloves, ensuring you stay protected while customizing your mesh.
UNMATCHED DURABILITY - Crafted from premium 304 stainless steel for long-lasting, rust-free performance.
PRECISION MESH DESIGN - 20 mesh with 1mm apertures offers optimal airflow while keeping pests out.
VERSATILE APPLICATION - Perfect for security screens, garden guards, fireplace protection, and more—adapt to any project.
USER FRIENDLY HANDLING - Easily cut with tin snips and flat-packed to avoid bent edges—professional-grade convenience.

Valchoose 3-pack 11”x11” steel mesh sheets feature 304 stainless steel construction with a 20 mesh plain weave design, offering 1mm apertures and 52% open area. Engineered for durability and versatility, these rust-resistant sheets are ideal for security, construction, and home projects, delivering professional-grade quality in a convenient, easy-to-handle package.

Specifications

Item diameter	1 Millimeters
Item thickness	0.4 Millimeters
Item form	Plain Weave
Item weight	0.31 Kilograms
UPC	609832383048
Number of Items	3
Manufacturer	nikura
Part number	Item-004
Item Weight	308 g
Item model number	Item-004
Size	13 Count (Pack of 1982)
Color	Silver
Style	3pack(20Mesh-Plain-Weave)
Finish	stainless steel
Item Package Quantity	3
Cutting Diameter	1 Millimeters
Measurement System	Inch
Batteries Included?	No
Batteries Required?	No

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