Is the product strong enough to keep open a window that wants to slide closed? My old window won't stay up and I'm looking for a way to prop it open.

Yes it will. I'm using it myself in a window that doesn't want to stay open. Plus it has weather stripping and bugs don't seem to get in like the ones that are sold at big box stores.

Is this enough to keep my cat from jumping out?

The tighter the fit, the greater the likelihood that your cat cannot jump out. I don't think my cat could jump out the windows that the screens are in. If the cat charges the screen, maybe! Good luck.

Do these screens rust?

I've only had mine for a few months, so I wouldn't know about rust. I can say that they seem to be pretty durable. I have five kittens jumping and scratching at the screens to get to the birds on my windowsill, and yet the screens appear to be fine so far.

do have screens to fit a20 1/2" wide by 31" long?

The description say's they are 15 inches high and 21to40 inches wide so you would have to measure your area and see.

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Fenestrelle Expandable Window Screen, 15″ H × 21″–40″ W Horizontal, 2-Pack

Product ID: 60092678

Details

Brand
Fenestrelle
Color
Gray
Item Weight
1.07 kg
Material
Aluminum
Product Dimensions
40"L x 21"W

🔥Flame resistant fiberglass mesh

↔️Expands 21"–40" wide

🛠️Tool-free quick installation

S/.895

Duties & taxes included

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Sold byAmazon PeruDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🪟 Upgrade your view with Fenestrelle: the screen that fits, protects, and performs!

HASSLE FREE INSTALLATION - No tools required—just slide in and close the sash for instant protection and ventilation.
BUILT IN WEATHERSTRIP SEAL - Fuzzy edges create a snug, draft-blocking fit for year-round comfort and energy savings.
PREMIUM FLAME RESISTANT MESH - Tight-weave fiberglass mesh blocks bugs and debris while enhancing safety with flame resistance.
DURABLE RUST RESISTANT FRAME - Powder-coated aluminum frame ensures long-lasting strength and sleek appearance.
CUSTOM FIT FOR DOUBLE HUNG WINDOWS - Adjusts horizontally and vertically to fit a wide range of window sizes effortlessly.

Fenestrelle Expandable Window Screen 2-Pack offers versatile 2-way adjustability (21"–40" wide, 15" high), a durable powder-coated aluminum frame, and flame-resistant fiberglass mesh. Designed for double hung windows, it features built-in weatherstripping for draft protection and installs tool-free for quick, secure fit—perfect for modern homes seeking comfort, safety, and style.

Specifications

ASIN	B0776ZP83Q
Best Sellers Rank	#4,890 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #3 in Window Screens
Color	Gray
Customer Reviews	4.7 4.7 out of 5 stars (9,368)
Date First Available	January 1, 2024
Finish	Powder Coated
Item Package Quantity	2
Item Weight	2.35 pounds
Item model number	FEN 84010
Manufacturer	AWarehousefull
Material	Aluminum
Part Number	FEN 84010
Product Dimensions	40 x 21 x 0.1 inches
Size	Medium (15" H x 21"-40" W)
Style	Pack of 2

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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Great price for an authentic product. Fast international shipping too!

3 weeks ago

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Smooth transaction and product arrived in perfect condition.

3 weeks ago

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S/.895

Duties & taxes included

In stock

Sold byAmazon PeruDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Peru.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

View all Trustpilot reviews