304 Stainless Steel External Wall Air Vent Cover with Gravity Check Valve for Ventilation System

• Customization: Available
• After-sales Service: on Line Service
• Warranty: One Year
• Model NO.: SUA
• ventilation mode: natural ventilation
• Certification: TUV, ISO9001, CE
• Product Name: External Wall Vent Cover
• Material: SUS 304 Stainless Steel
• Manufacturing Process: Integral Mold Stamping
• Surface Finish: Brushed / Polished Stainless Steel
• Structure: Square Panel + Round Pipe Interface
• Damper Type: Gravity Flap
• Connection Diameter: 100 mm / 150 mm
• Temperature Range: -40℃ to 120℃
• Installation: External Wall Mounted
• Accessories: Rubber Seal, Screws, Anchors
• Transport Package: Carton
• Specification: SUA
• Trademark: Airandus
• Origin: China
• Package Size: 59.00cm * 40.00cm * 52.00cm
• Package Gross Weight: 12.000kg

Product Description

SUA- Stainless External Louver

Definition: This is an end device of the ventilation system, installed on the exterior wall of a building, with dual functions of exhaust and protection. Its working principle is to achieve automatic opening by utilizing air pressure difference. When the indoor fan is running, the airflow pushes open the movable flap to exhaust air. After shutdown, the flap automatically closes under the action of gravity, thereby preventing outdoor air from backflowing into the indoor space.

Specification

Application Scenarios:

Kitchen: Connect to range hood, prevent cooking fumes from backflowing through the common flue

Bathroom: Connect to exhaust fan, prevent moisture and odors from entering

Dryer: Discharge hot air and fibers, prevent outdoor cold air from flowing back

Fresh Air System: Exterior wall end exhaust vent Industrial

Workshop: Ventilation system exterior wall outlet

Core Materials and Manufacturing

Installation Method :1. Measure the diameter of the wall hole and select the corresponding size exhaust hood 2. Attach the rubber sealing gasket to the outer edge of the hood (requires some patience) 3. Insert the dustproof grille with the connector into the ventilation pipe4. Ensure Direction: The flap must face downward in a vertical closed state 5. Mark the four corner screw holes, drill holes, and fix the four corners with expansion screws or stainless steel screws 6. Apply glass glue or structural glue around the perimeter to enhance sealing and prevent rainwater from seeping into the wall interior

Key Product Advantages:

1. All-Weather Protection: Slanted design effectively prevents rain and snow
2. Long-Lasting Durability: Stainless steel material with a service life of over 10-15 years, superior to ABS plastic
3. Aesthetic Appeal: Metallic texture, matching modern building exterior wall styles
4. Zero Energy Consumption: Pure gravity drive, requiring no electrical support
5. Silent Design: Silicone shock-absorbing gasket eliminates impact noise
6. Easy Installation: Includes all installation accessories

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Technical Specifications

(Custom configurations available upon request.)

Model	Dimension (mm)
	A	B	C
100	97	137	52
125	120	167	52
150	145	167	62

Installation Guide

Installation Guide

• Measure the diameter of the wall hole and select the corresponding size exhaust hood

• Attach the rubber sealing gasket to the outer edge of the hood (requires some patience)

• Insert the dustproof grille with the connector into the ventilation pipe

• Ensure Direction: The flap must face downward in a vertical closed state

• Mark the four corner screw holes, drill holes, and fix the four corners with expansion screws or stainless steel screws

• Apply glass glue or structural glue around the perimeter to enhance sealing and prevent rainwater from seeping into the wall interior

Standard seaworthy package

Comparable Products

Feature	Stainless Steel (304/316)	Plastic (ABS/PP)	Aluminum Alloy
Durability	Extremely High. Corrosion-resistant & rust-proof. Lasts 10+ years.	Low. Becomes brittle, yellows, or cracks over time.	Moderate. Rust-free but prone to white oxidation spots.
Weather Resistance	Excellent. Resists extreme heat and sub-zero temperatures.	Poor. May deform in high heat or shatter in freezing cold.	Good. Stable, but has high thermal expansion.
UV Resistance	Immune. Does not degrade under direct sunlight.	Weak. Direct sunlight causes discoloration and structural decay.	Excellent. Very stable under UV exposure.
Fire Safety	Non-combustible. Highest fire rating (Grade A).	Combustible. May release toxic fumes if melted.	Non-combustible. Will melt at high temperatures but won't burn.
Aesthetics	Premium. Sleek, modern look with brushed or mirror finishes.	Basic. Often looks "cheap" and shows age quickly.	Clean. Usually powder-coated or anodized for various colors.
Maintenance	Minimal. Self-cleaning by rain; easy to wipe off grease.	High. Needs frequent replacement due to aging.	Moderate. May require re-coating if the finish peels.
Cost	High ($). Best long-term investment.	Lowest ($). Cheap upfront but high replacement cost.	Medium ($). A balanced middle-ground choice.
Best Used For	High-end residential, coastal areas, commercial kitchens.	Low-budget projects, temporary structures.	Standard residential housing, dry climates.

FAQ

Q1: Will it rust after being exposed to rain and sun?

No. Due to the high nickel content in 304 stainless steel, it is highly resistant to rust and oxidation. It will maintain its brushed finish even in harsh weather conditions for years.

Q2: Does the flap make a loud noise in the wind?

We have addressed this common issue by adding silencing gaskets/buffer pads (optional feature) to the contact points. This significantly reduces the "clattering" noise during windy days or high-airflow operation.

Q3:Is it effective against backdrafts?

Absolutely. The gravity-fed flap is designed to stay closed when the fan is off. This creates a physical barrier that prevents cold air, odors, and dust from blowing back into your house.

Q4:  Is installation difficult?

Not at all. The vent features 3-4 fixing clips on the neck for a "push-fit" installation. For extra security, we recommend
using the provided screw holes on the outer frame and a bead of silicone sealant around the edges to ensure it's completely waterproof.

Q5: How do I clean it?

Stainless steel is very low-maintenance. You can simply wipe the surface with a damp cloth or use a mild stainless steel
cleaner to remove grease (if used as a kitchen range hood exhaust).

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