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Dayton Roof Curb: Fixed Ventilated Curbs, Square Curb, 21 x 21 in Inside Dim - Roof Curbs
DaytonRoof Curbs

Dayton Roof Curb: Fixed Ventilated Curbs, Square Curb, 21 x 21 in Inside Dim

The Dayton Roof Curb: Fixed Ventilated Curbs (SKU 4HX56) is a square steel roof curb with a galvanized finish, designed for downblast fans. It has an inside width of 21 in and an outside width of 24-1/2 in, and…

SKU 3G-OTH-79368

Brand
Dayton
Item
Roof Curb: Fixed Ventilated Curbs, Square Curb, 21 x 21 in Inside Dim
Category
Roof Curbs
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Technical Specifications

Dayton
Manufacturer Part Number
4HX56
Type
Square Curb, Mfr Part # 4HX56
Material
Steel
Finish
Galvanized
Standards
NFPA 96
Inside Dim
21 x 21 in
For Fan Type
Downblast Fans
Curb Inside Width
21 in
Curb Outside Width
24-1/2 in
View Full Spec Sheet

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

Product Description

The Dayton Roof Curb: Fixed Ventilated Curbs (SKU 4HX56) is a square steel roof curb with a galvanized finish, designed for downblast fans. It has an inside width of 21 in and an outside width of 24-1/2 in, and complies with NFPA 96 standards.

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 roof curbs. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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Roof Curb: Fixed Ventilated Curbs, Square Curb, 41 x 41 in Inside Dim, Mfr Part # 4HX60. Key specifications — Curb Outside Width: 44-1/2 in; Finish: Galvanized; For Fan Type: Upblast Fans; Standards: NFPA 96; Manufacturer Part Number: 4HX60; Brand: DAYTON; Curb Inside Width: 41 in; Material: Steel.
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Roof Curb: Fixed Ventilated Curbs, Square Curb, 41 x 41 in Inside Dim, Mfr Part # 4HX60. Key specifications — Curb Outside Width: 44-1/2 in; Finish: Galvanized; For Fan Type: Upblast Fans; Standards: NFPA 96; Manufacturer Part Number: 4HX60; Brand: DAYTON; Curb Inside Width: 41 in; Material: Steel.
Roof Curb: Fixed Ventilated Curbs, Square Curb, 29 x 29 in Inside Dim, Mfr Part # 4HX58. Key specifications — Curb Outside Width: 32-1/2 in; Finish: Galvanized; For Fan Type: Downblast Fans; Standards: UL 762; Manufacturer Part Number: 4HX58; Brand: DAYTON; Curb Inside Width: 29 in; Material: Steel.
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Roof Curb: Fixed Ventilated Curbs, Square Curb, 25 x 25 in Inside Dim, Mfr Part # 4HX57. Key specifications — Curb Outside Width: 28-1/2 in; Finish: Galvanized; For Fan Type: Downblast Fans; Standards: UL 705; Manufacturer Part Number: 4HX57; Brand: DAYTON; Curb Inside Width: 25 in; Material: Steel.
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Roof Curb: Fixed Ventilated Curbs, Square Curb, 25 x 25 in Inside Dim, Mfr Part # 4HX57. Key specifications — Curb Outside Width: 28-1/2 in; Finish: Galvanized; For Fan Type: Downblast Fans; Standards: UL 705; Manufacturer Part Number: 4HX57; Brand: DAYTON; Curb Inside Width: 25 in; Material: Steel.
Roof Curb: Adj Ventilated Curbs, Square Curb, 21 in to 26 in x 21 in to 26 in Inside Dim (MPN 4HX62). Key specifications — Curb Outside Width: 24 in to 29 in; Finish: Galvanized; For Fan Type: Downblast Fans; Standards: NFPA 96; Manufacturer Part Number: 4HX62; Brand: DAYTON; Curb Inside Width: 21 in to 26 in; Material: Steel.
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Roof Curb: Adj Ventilated Curbs, Square Curb, 21 in to 26 in x 21 in to 26 in Inside Dim (MPN 4HX62). Key specifications — Curb Outside Width: 24 in to 29 in; Finish: Galvanized; For Fan Type: Downblast Fans; Standards: NFPA 96; Manufacturer Part Number: 4HX62; Brand: DAYTON; Curb Inside Width: 21 in to 26 in; Material: Steel.
Roof Curb: Fixed Ventilated Curbs, Square Curb, 14 x 14 in Inside Dim, Mfr Part # 4HX54. Key specifications — Curb Outside Width: 17-1/2 in; Finish: Galvanized; For Fan Type: Upblast Fans; Standards: UL 705; Manufacturer Part Number: 4HX54; Brand: DAYTON; Curb Inside Width: 14 in; Material: Steel.
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Roof Curb: Fixed Ventilated Curbs, Square Curb, 14 x 14 in Inside Dim, Mfr Part # 4HX54. Key specifications — Curb Outside Width: 17-1/2 in; Finish: Galvanized; For Fan Type: Upblast Fans; Standards: UL 705; Manufacturer Part Number: 4HX54; Brand: DAYTON; Curb Inside Width: 14 in; Material: Steel.
Roof Curb: Fixed Ventilated Curbs, Square Curb, 17 x 17 in Inside Dim, Mfr Part # 4HX55. Key specifications — Curb Outside Width: 20-1/2 in; Finish: Galvanized; For Fan Type: Filtered Supply Fans; Standards: UL 762; Manufacturer Part Number: 4HX55; Brand: DAYTON; Curb Inside Width: 17 in; Material: Steel.
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Roof Curb: Fixed Nonventilated Curbs, Square Curb, 24.5 in x 24 1/2 in Inside Dim, Mfr Part # 2RB78. Key specifications — Curb Outside Width: 27-1/2 in; Finish: Galvanized; For Fan Type: Filtered Supply Fans; For Use With: 29 in Square Base; Standards: UL 705; Manufacturer Part Number: 2RB78; Brand: DAYTON; Curb Inside Width: 24-1/2 in.
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Roof Curb: Fixed Nonventilated Curbs, Square Curb, 24.5 in x 24 1/2 in Inside Dim, Mfr Part # 2RB78. Key specifications — Curb Outside Width: 27-1/2 in; Finish: Galvanized; For Fan Type: Filtered Supply Fans; For Use With: 29 in Square Base; Standards: UL 705; Manufacturer Part Number: 2RB78; Brand: DAYTON; Curb Inside Width: 24-1/2 in.
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Roof Curb: Adj Nonventilated Curbs, Square Curb, 60 in to 68 1/2 in Inside Dim, Mfr Part # 2ZV87. Key specifications — Curb Outside Width: 64 in to 72-1/2 in; Finish: Galvanized; For Fan Type: Downblast Fans; For Use With: 65-1/2 in to 71 in Square Base; Standards: UL 705; Manufacturer Part Number: 2ZV87; Brand: DAYTON; Curb Inside Width: 60 in to 68-1/2 in.
Roof Curb: Fixed Nonventilated Curbs, Square Curb, 59.5 x 59 1/2 in Inside Dim, Mfr Part # 2RB83. Key specifications — Curb Outside Width: 62-1/2 in; Finish: Galvanized; For Fan Type: Filtered Supply Fans; For Use With: 64 in Square Base; Standards: UL 705; Manufacturer Part Number: 2RB83; Brand: DAYTON; Curb Inside Width: 59-1/2 in.
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Roof Curb: Fixed Nonventilated Curbs, Square Curb, 34.5 x 34 1/2 in Inside Dim, Mfr Part # 3AZJ1. Key specifications — Curb Outside Width: 37-1/2 in; Finish: Galvanized; For Fan Type: Filtered Supply Fans; For Use With: 39 in Square Base; Standards: UL 705; Manufacturer Part Number: 3AZJ1; Brand: DAYTON; Curb Inside Width: 34-1/2 in.
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Roof Curb: Fixed Nonventilated Curbs, Square Curb, 34.5 x 34 1/2 in Inside Dim, Mfr Part # 3AZJ1. Key specifications — Curb Outside Width: 37-1/2 in; Finish: Galvanized; For Fan Type: Filtered Supply Fans; For Use With: 39 in Square Base; Standards: UL 705; Manufacturer Part Number: 3AZJ1; Brand: DAYTON; Curb Inside Width: 34-1/2 in.
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Roof Curb: Fixed Nonventilated Curbs, Square Curb, 37.5 x 37 1/2 in Inside Dim, Mfr Part # 2RB81. Key specifications — Curb Outside Width: 40-1/2 in; Finish: Galvanized; For Fan Type: Filtered Supply Fans; For Use With: 42 in Square Base; Standards: UL 705; Manufacturer Part Number: 2RB81; Brand: DAYTON; Curb Inside Width: 37-1/2 in.
Roof Curb: Adj Nonventilated Curbs, Square Curb, 10 1/2 in to 19 in Inside Dim, Mfr Part # 2ZV82. Key specifications — Curb Outside Width: 14-1/2 in to 23 in; Finish: Galvanized; For Fan Type: Upblast Fans; For Use With: 16 in to 21-1/2 in Square Base; Standards: UL 705; Manufacturer Part Number: 2ZV82; Brand: DAYTON; Curb Inside Width: 10-1/2 in to 19 in.
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Roof Curb: Adj Nonventilated Curbs, Square Curb, 10 1/2 in to 19 in Inside Dim, Mfr Part # 2ZV82. Key specifications — Curb Outside Width: 14-1/2 in to 23 in; Finish: Galvanized; For Fan Type: Upblast Fans; For Use With: 16 in to 21-1/2 in Square Base; Standards: UL 705; Manufacturer Part Number: 2ZV82; Brand: DAYTON; Curb Inside Width: 10-1/2 in to 19 in.