We ship to the Philippines — door-to-door, customs and logistics handled by 3G Electric

3G Electric
RFQ CartGet a QuoteSign inSign up
Dayton 21"H-W 6.5"L Extrd Alu Backdraft Dampr: For 18 in Fan, Single Panel, 21 in H - Wall-Mount Backdraft Dampers
DaytonWall-Mount Backdraft Dampers

Dayton 21"H-W 6.5"L Extrd Alu Backdraft Dampr: For 18 in Fan, Single Panel, 21 in H

The Dayton 4FZH5 is a wall-mount backdraft damper with extruded aluminum flat blades, designed for horizontal airflow in a vertical mounting position. It has a maximum air velocity of 3250 fpm and is sized for an…

SKU 3G-OTH-76230

Brand
Dayton
Item
21"H-W 6.5"L Extrd Alu Backdraft Dampr: For 18 in Fan, Single Panel, 21 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
4FZH5
Type
Single Panel, 21 in W, Wall
D
3 in
H
21 in
Blade Type
Flat Blade
Airflow Direction
Horizontal
Mounting Position
Vertical
Maximum Air Velocity
3250 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 4FZH5 is a wall-mount backdraft damper with extruded aluminum flat blades, designed for horizontal airflow in a vertical mounting position. It has a maximum air velocity of 3250 fpm and is sized for an 18-inch fan, with dimensions of 21 inches high, 21 inches wide, and 3 inches deep.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is the Dayton 4FZH5 backdraft damper used for?

The Dayton 4FZH5 is a wall-mount backdraft damper that prevents reverse airflow in exhaust systems. It is used with 18-inch fans in commercial or industrial ventilation, allowing horizontal airflow only when the fan operates and closing automatically when the fan stops.

What are the specifications of the Dayton 4FZH5 damper?

The Dayton 4FZH5 has extruded aluminum flat blades, a maximum air velocity of 3250 fpm, and dimensions of 21 in H x 21 in W x 3 in D. It is designed for horizontal airflow with vertical mounting and fits an 18-inch fan. The manufacturer part number is 4FZH5.

Where to buy the Dayton 4FZH5 damper worldwide?

3G Electric supplies the Dayton 4FZH5 backdraft damper 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 region.

How to install the Dayton 4FZH5 backdraft damper?

Mount the Dayton 4FZH5 vertically on a wall with the airflow direction arrow pointing horizontally. Secure the damper frame to the wall opening using appropriate fasteners. Ensure the blades move freely and the damper is level for proper gravity-assisted closing.

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
23"H-W 6.5"L Extrd Alu Backdraft Dampr: For 20 in Fan, Single Panel, 23 in H, 23 in W, 3 in D, Wall (MPN 4FZH6). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 3250 fpm; Mounting Position: Vertical.
Dayton
23"H-W 6.5"L Extrd Alu Backdraft Dampr: For 20 in Fan, Single Panel, 23 in H, 23 in W, 3 in D, Wall (MPN 4FZH6). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 3250 fpm; Mounting Position: Vertical.
33"H-W 6.5"L Extrd Alu Backdraft Dampr: For 30 in Fan, Single Panel, 33 in H, 33 in W, 3 in D, Wall (MPN 4FZH8). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 3250 fpm; Mounting Position: Vertical.
Dayton
33"H-W 6.5"L Extrd Alu Backdraft Dampr: For 30 in Fan, Single Panel, 33 in H, 33 in W, 3 in D, Wall (MPN 4FZH8). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 3250 fpm; Mounting Position: Vertical.
27"H-W 6.5"L Extrd Alu Backdraft Dampr: For 24 in Fan, Single Panel, 27 in H, 27 in W, 3 in D, Wall (MPN 4FZH7). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 3250 fpm; Mounting Position: Vertical.
Dayton
27"H-W 6.5"L Extrd Alu Backdraft Dampr: For 24 in Fan, Single Panel, 27 in H, 27 in W, 3 in D, Wall (MPN 4FZH7). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 3250 fpm; Mounting Position: Vertical.
39"H-W 6.5"L Extrd Alu Backdraft Dampr: For 36 in Fan, Single Panel, 39 in H, 39 in W, 3 in D, Wall (MPN 4FZH9). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 3250 fpm; Mounting Position: Vertical.
Dayton
39"H-W 6.5"L Extrd Alu Backdraft Dampr: For 36 in Fan, Single Panel, 39 in H, 39 in W, 3 in D, Wall (MPN 4FZH9). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 3250 fpm; Mounting Position: Vertical.
21"H-W 5 1/4"L SS Backdraft Dampr: For 18 in Fan, Single Panel, 21 in H, 21 in W, 2 in D, Horizontal (MPN 4FZJ6). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
Dayton
21"H-W 5 1/4"L SS Backdraft Dampr: For 18 in Fan, Single Panel, 21 in H, 21 in W, 2 in D, Horizontal (MPN 4FZJ6). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 2500 fpm; Mounting Position: Vertical.
45"H-W 6.5"L Extrd Alu Backdraft Dampr: For 42 in Fan, Double Panel, 45 in H, 45 in W, 3 in D, Wall (MPN 4FZJ1). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 3250 fpm; Mounting Position: Vertical.
Dayton
45"H-W 6.5"L Extrd Alu Backdraft Dampr: For 42 in Fan, Double Panel, 45 in H, 45 in W, 3 in D, Wall (MPN 4FZJ1). Key specifications — Airflow Direction: Horizontal; Blade Type: Flat Blade; Brand: DAYTON; Maximum Air Velocity: 3250 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.