Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
Dayton 33"H-W 5.75"L Aluminum Backdraft Damper: For 30 in Fan, Single Panel, 33 in H - Wall-Mount Backdraft Dampers
DaytonWall-Mount Backdraft Dampers

Dayton 33"H-W 5.75"L Aluminum Backdraft Damper: For 30 in Fan, Single Panel, 33 in H

The Dayton 33"H-W 5.75"L Aluminum Backdraft Damper (SKU 3C309) is a wall-mount backdraft damper designed for a 30-inch fan. It features a flat blade type, horizontal airflow direction, and vertical mounting position…

SKU 3G-OTH-76462

Brand
Dayton
Item
33"H-W 5.75"L Aluminum Backdraft Damper: For 30 in Fan, Single Panel, 33 in H
Category
Wall-Mount Backdraft Dampers
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

Dayton
Manufacturer Part Number
3C309
Type
Single Panel, 33 in W, Wall
D
3 in
H
33 in
Blade Type
Flat Blade
Airflow Direction
Horizontal
Mounting Position
Vertical
Maximum Air Velocity
2500 fpm
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

Dayton Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Dayton 33"H-W 5.75"L Aluminum Backdraft Damper (SKU 3C309) is a wall-mount backdraft damper designed for a 30-inch fan. It features a flat blade type, horizontal airflow direction, and vertical mounting position, with a maximum air velocity of 2500 fpm.

Frequently Asked Questions

What is the Dayton 3C309 backdraft damper used for?

The Dayton 3C309 backdraft damper prevents reverse airflow in exhaust or intake systems. It is wall-mounted vertically for a 30-inch fan, using flat blades that open with forward airflow and close by gravity when flow stops, protecting ventilation systems in commercial or industrial buildings.

What are the specifications of the Dayton 3C309 backdraft damper?

The Dayton 3C309 is a single-panel aluminum backdraft damper with dimensions 33 in H x 33 in W x 3 in D. It has flat blades, horizontal airflow direction, vertical mounting, and a maximum air velocity of 2500 fpm. It is designed for a 30-inch fan and is manufactured by Dayton.

Where to buy the Dayton 3C309 backdraft damper worldwide?

3G Electric supplies the Dayton 3C309 backdraft damper to customers worldwide. As a global industrial equipment distributor since 1990, we handle full logistics, customs clearance, and delivery to your site. Contact us for availability and a quote for your location.

How to install the Dayton 3C309 backdraft damper?

Install the Dayton 3C309 damper vertically in a wall opening matching its 33 in H x 33 in W dimensions. Ensure the airflow direction arrow points horizontally away from the fan. Secure the frame with appropriate fasteners and seal edges to prevent air leaks. Follow standard HVAC damper installation practices.

Used in

Common applications for Dayton
HVAC ventilation — DAYTON centrifugal upblast roof exhaust fans (SKU 7M7U3) for kitchen exhaust systems
Mechanical power transmission — DAYTON HTD timing pulleys (SKU 404GV0) for conveyor belt drives
Process water handling — DAYTON self-priming centrifugal pumps (SKU 2ZXT4) for dewatering or transfer
Roofing and building services — DAYTON fixed ventilated roof curbs (SKU 4HX59) for filtered supply fan installations
Material handling — DAYTON latch assemblies (SKU 2KEN4) for electric chain hoist hook safety
Industrial air movement — DAYTON downblast roof exhaust fans (SKU 3HFL9) for clean air exhaust in manufacturing plants

Dayton Products

3G Electric supplies Dayton wall-mount backdraft dampers. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description
39"H-W 5.75"L Alu Wall Backdraft Damper: For 36 in Fan, Single Panel, 39 in H, 39 in W, 2 1/2 in D (MPN 3C310). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
Dayton
39"H-W 5.75"L Alu Wall Backdraft Damper: For 36 in Fan, Single Panel, 39 in H, 39 in W, 2 1/2 in D (MPN 3C310). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
27"H-W 5.75"L Aluminum Backdraft Damper: For 24 in Fan, Single Panel, 27 in H, 27 in W, 2 1/2 in D (MPN 3C308). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
Dayton
27"H-W 5.75"L Aluminum Backdraft Damper: For 24 in Fan, Single Panel, 27 in H, 27 in W, 2 1/2 in D (MPN 3C308). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
57"H-W 6 1/4"L Aluminum Backdraft Damper: For 54 in Fan, Double Panel, 57 in H, 57 in W, 3 in D (MPN 3C313). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
Dayton
57"H-W 6 1/4"L Aluminum Backdraft Damper: For 54 in Fan, Double Panel, 57 in H, 57 in W, 3 in D (MPN 3C313). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
51"H-W 5.75"L Aluminum Backdraft Damper: For 48 in Fan, Double Panel, 51 in H, 51 in W, 3 in D, Wall (MPN 3C312). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
Dayton
51"H-W 5.75"L Aluminum Backdraft Damper: For 48 in Fan, Double Panel, 51 in H, 51 in W, 3 in D, Wall (MPN 3C312). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
33"H-W 6.5"L Fiberglass Backdraft Damper: For 30 in Fan, Single Panel, 33 in H, 33 in W, 3 in D (MPN 5C216). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
Dayton
33"H-W 6.5"L Fiberglass Backdraft Damper: For 30 in Fan, Single Panel, 33 in H, 33 in W, 3 in D (MPN 5C216). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
63"H-W 6 1/4"L Alu Wall Backdraft Dampr: For 60 in Fan, Double Panel, 63 in H, 63 in W, 3 in D, Wall (MPN 3C314). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
Dayton
63"H-W 6 1/4"L Alu Wall Backdraft Dampr: For 60 in Fan, Double Panel, 63 in H, 63 in W, 3 in D, Wall (MPN 3C314). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.

More from Dayton

View all Dayton parts →
19"H-W 6.5"L Fiberglass Backdraft Damper: For 16 in Fan, Single Panel, 19 in H, 19 in W, 3 in D (MPN 5C212). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
Dayton
19"H-W 6.5"L Fiberglass Backdraft Damper: For 16 in Fan, Single Panel, 19 in H, 19 in W, 3 in D (MPN 5C212). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
15"H-W 6.5"L Extrd Alu Backdraft Dampr: For 12 in Fan, Single Panel, 15 in H, 15 in W, 3 in D, Wall (MPN 4FZH3). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 3250 fpm; Mounting Position: Vertical.
Dayton
15"H-W 6.5"L Extrd Alu Backdraft Dampr: For 12 in Fan, Single Panel, 15 in H, 15 in W, 3 in D, Wall (MPN 4FZH3). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 3250 fpm; Mounting Position: Vertical.
45"H-W 5.75"L Aluminum Backdraft Damper: For 42 in Fan, Double Panel, 45 in H, 45 in W, 3 in D, Wall (MPN 3C311). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
Dayton
45"H-W 5.75"L Aluminum Backdraft Damper: For 42 in Fan, Double Panel, 45 in H, 45 in W, 3 in D, Wall (MPN 3C311). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
63"H-W 6 1/4"L Aluminum Backdraft Damper: For 60 in Fan, Double Panel, 63 in H, 63 in W, 3 in D (MPN 3HHP2). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
Dayton
63"H-W 6 1/4"L Aluminum Backdraft Damper: For 60 in Fan, Double Panel, 63 in H, 63 in W, 3 in D (MPN 3HHP2). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
25"H-W 5.75"L Aluminum Wall Fan Shutter: For 20 in Fan, Single Panel, 25 in H, 25 in W, 3 in D, Wall (MPN 53DR17). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
Dayton
25"H-W 5.75"L Aluminum Wall Fan Shutter: For 20 in Fan, Single Panel, 25 in H, 25 in W, 3 in D, Wall (MPN 53DR17). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
27"H-W 5 1/4"L SS Backdraft Dampr: For 24 in Fan, Double Panel, 27 in H, 27 in W, 2 in D, Horizontal (MPN 4FZJ8). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
Dayton
27"H-W 5 1/4"L SS Backdraft Dampr: For 24 in Fan, Double Panel, 27 in H, 27 in W, 2 in D, Horizontal (MPN 4FZJ8). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
13"H-W 5.75"L Aluminum Backdraft Damper: For 10 in Fan, Single Panel, 13 in H, 13 in W, 2 1/2 in D (MPN 4C555). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
Dayton
13"H-W 5.75"L Aluminum Backdraft Damper: For 10 in Fan, Single Panel, 13 in H, 13 in W, 2 1/2 in D (MPN 4C555). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
19"H-W 6.5"L Extrd Alu Backdraft Dampr: For 16 in Fan, Single Panel, 19 in H, 19 in W, 3 in D, Wall (MPN 4FZH4). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 3250 fpm; Mounting Position: Vertical.
Dayton
19"H-W 6.5"L Extrd Alu Backdraft Dampr: For 16 in Fan, Single Panel, 19 in H, 19 in W, 3 in D, Wall (MPN 4FZH4). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 3250 fpm; Mounting Position: Vertical.