Name: 20 x 20 inches
Brand: Byson
SKU: 612990767
Price: 1285.62 HKD
Availability: OutOfStock
Rating: 4.230769230769231 (13 reviews)

Description

These grilles are used on exteriors of buildings at air exhaust points in the HVAC system. The design of the grille utilizes louvers which are closed by default due to gravity. When air is exhausted through the system, it forces the louvers open for the duration of the exhaust sequence. The louvers then naturally close again with gravity, preventing any air intake.
Please note per above that this louvers are by design not fixed open or adjustable, they open with force of exhaust air and fall shut with gravity.
Versatile Applications: They can be used in various applications that require permanent large-scale ventilation combined with screening. This includes air exhaust for ventilation or air conditioning systems, plant rooms, generators, workshops, garages, and pumping stations.
Robust Construction: Crafted from durable extruded aluminum sections, featuring a sturdy 2mm thick frame and 1mm thick blades.
Anodized Aluminum : The standard finish is a aluminum anodized coating that not only protects but also enhances the aesthetic appeal with its classy design.
Installation: Self tapping screws (not included) can be used to drill directly into the grille face or neck, depending on preference, and fix it to the surface (wall or wooden frame) as required.

Byson Gravity Grille Anodized Aluminum with Gravity Shutter 20 x 20 inches – Weatherproof Ventilation for Walls and Crawl Spaces - desertcart.com Review: works well and doesn't leak - Mine came without any space near the top leading to rain incursion, like was complained about in some of the reviews . . all the blades move freely, and don't bump into each other or the frame . . I like the frame, lotsa possibilities to mount without a hassle, the cast blades seem more durable than pressed sheet metal, and the small amount of extra weight is nice when the wind blows at JUST the wrong angle to try and lift 'em . . . we get kinda whippy-windy in the "Authentic Northwest", which can leave you up at night and cranky, so when the blades don't flop, I sleep better . . . . Review: Perfect replacement vent cover! - This grill is a total winner. I was struggling to find a vent that could fit a large hole in the siding after removing a relic of a vent from a 1920"s flip. I went to several local hardware stores, home depot and lowe's included to find a vent that was gravity assisted (in that when my tenants turned it off, it would close and not allow bugs or cold air come back in but also allow hot air from the shower and dryer escape easily. This grill had everything I was looking for including a nice, low profile design, and it was affordable. Sure beats what was there before! I installed it myself, instead of paying the fortune that I was quoted for a couple of HVAC guys to put other vents in. Do it yourself all the way!! Easy handling, light and not heavy, quiet and durable. Perfect fit!

Reviews

I**N

works well and doesn't leak

Mine came without any space near the top leading to rain incursion, like was complained about in some of the reviews . . all the blades move freely, and don't bump into each other or the frame . . I like the frame, lotsa possibilities to mount without a hassle, the cast blades seem more durable than pressed sheet metal, and the small amount of extra weight is nice when the wind blows at JUST the wrong angle to try and lift 'em . . . we get kinda whippy-windy in the "Authentic Northwest", which can leave you up at night and cranky, so when the blades don't flop, I sleep better . . . .

9.04.2026

S**E

Perfect replacement vent cover!

This grill is a total winner. I was struggling to find a vent that could fit a large hole in the siding after removing a relic of a vent from a 1920"s flip. I went to several local hardware stores, home depot and lowe's included to find a vent that was gravity assisted (in that when my tenants turned it off, it would close and not allow bugs or cold air come back in but also allow hot air from the shower and dryer escape easily. This grill had everything I was looking for including a nice, low profile design, and it was affordable. Sure beats what was there before! I installed it myself, instead of paying the fortune that I was quoted for a couple of HVAC guys to put other vents in. Do it yourself all the way!! Easy handling, light and not heavy, quiet and durable. Perfect fit!

16.07.2025

A**R

PERFECT

PERFECT IT FIT AND DELIVERD ON TIME

25.07.2025

A**R

Aluminum gravity damper

Product was as advertised

12.07.2025

M**T

It works perfectly

Just what I needed

2.09.2024

S**I

Good grill

Easy to fit.

11.09.2024

T**S

This is how it came out of the box

Item was damaged...

19.03.2024

B**E

Cheaply made

They clink and clank when the wind blows

12.02.2025

D**M

Très bien construit...

12.10.2025

S**E

Does the job well. Was exactly what we needed for our greenhouse. Very happy with this item. Highly recommend!

14.08.2024

B**N

Well packaged. Nice finish. Good seal.

22.03.2024

R**N

It serves my purpose. Light and easy to install. Also came in a proper packaging.

22.11.2025

S**N

Dans les spécifications il est marqué entré d’air et sortir il a pas rien qui retiens les lames ouverte alors l’ air ne peut pas rentrée

16.02.2024

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

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.

ASIN	B0CLT35R3P
Batteries Required?	No
Best Sellers Rank	#169,081 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #977 in Registers, Grilles & Vents
Customer Reviews	4.4 4.4 out of 5 stars (44)
Date First Available	October 26, 2023
Item Weight	2.99 pounds
Manufacturer	Byson
Package Dimensions	22.5 x 22 x 2.5 inches
Size	20x20 inches

20 x 20 inches

Description

Specifications

Reviews

Common Questions