Product Overview

Allegro 20 Inch Explosion-Proof Fan is an equipment, accessory, or hardware item supplied for facility operations and process support.

Product Description

Electric, explosion-proof motor is UL/CSA listed single phase motor and NEMA rated. 115V plug and 3 blade fan. Meets Class I, Division 1 and 2, Groups C & D, and Class II, Division 1 and 2, Groups F & G.

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GENERAL DESCRIPTION:

For use in applications requiring a large amount of output in a hazardous location environment. Allegro’s 20” (50.8cm) Explosion Proof blower is offered with a 1/2 HP Explosion Proof motor with an efficient 3-blade fan in a rugged metal housing. Certified to CSA Standard C22.2 No. 113. 


Free Air One 90° Bend Two 90° Bends

4650   3150   2950
75 lbs. 8.2A /4.1A/115/230V


CONSTRUCTION:

  • Complete unit epoxy powder coated in orange
  • Interchangeable flange for intake or exhaust side mounting
  • 16 gauge cold rolled steel housing
  • Integrated carrying handles on four sides
  • Steel grill (zinc plated)
  • Equipped with four rubber feet
  • Stackable design MOTOR: HP: 1/2 HP Certifications: UL Listed, CSA certified Voltage/Hz: 115/230V AC, 60 Hz, Single Phase RPM: 1725 Current Draw: 8.2/4.1A Cord: 25’ (7.62m) 12/3 AWG SJOOW 90C 300V medium duty Plug: NEMA 20 Amp plug, explosion proof rated.


MOTOR:

  • HP: 1/2 HP
  • Certifications: UL Listed, CSA certified
  • Voltage/Hz: 115/230V AC, 60 Hz, Single Phase RPM: 1725
  • Current Draw: 8.2/4.1A
  • Cord: 25’ (7.62m) 12/3 AWG SJOOW 90C 300V medium duty
  • Plug: NEMA 20 Amp plug, explosion-proof rated.


FAN:

  • Anti-Static glass reinforced polyamide three blade fan with aluminum hub
  • Moving fan mounted 1 5/8” (4.12 cm) from grill for safety, grill gap 5/16” (0.79 cm) DUCTING: (Accessory)
  • Black single-ply, neoprene coated, statically conductive vinyl/polyester material, temperature resistant up to 250°F (121.1°C)
  • Retractable, non-collapsible design. Class 1 hard drawn spring steel wire helix (meets ASTM 227 specs)


HAZARDOUS LOCATION RATING:

Class: I 

Class: II

Divisions: 1 & 2 Divisions 1 & 2
Groups: C & D Groups: F & G


BLOWER DIMENSIONS:

Length ln. (cm) Width ln. (cm) Height ln. (cm)  Weight Lbs. (Kg)
19” (48.2 cm) 22” (55.8 cm) 22 ½” (57.1 cm) 75 lbs. (34 kg)

 

 FLOW RATES: (CFM calculated using 15’ (4.75m) of 20” (50.8cm) ducting)

Free Air CFM (m3 /hr)  One 90° Bend CFM (m3 /hr)  Two 90° Bends CFM (m3 /hr)
4650 (7900.39)  3150 (5351.88)  2950 (5012.08)

 

Key Features

  • Explosion-Proof Construction
  • High-Volume Airflow
  • Heavy-Duty Industrial Design

Common Applications

Confined spaces

Worker ventilation

Provides fresh air circulation for tanks, vaults, manholes, and other confined work areas.

Industrial safety

Hazardous location ventilation

Designed for facilities where combustible gases, vapors, or volatile atmospheres require explosion-proof equipment.

Chemical processing

Fume extraction

Helps ventilate processing areas during maintenance, cleaning, and equipment servicing.

Handling & Storage

Store the fan in a clean, dry location protected from moisture, corrosive chemicals, and physical damage. Inspect the power cord, housing, motor, and guards before each use. Keep ventilation openings free of debris and follow manufacturer recommendations for transport, storage, and routine maintenance. When used with ducting, ensure all connections are properly secured before operation.

Safety Notes

Only operate the fan in accordance with the manufacturer's instructions and applicable hazardous-location regulations. Verify that the equipment is suitable for the classified area before use. Inspect electrical components before operation and never use the fan if damage is present. Wear appropriate personal protective equipment (PPE) and follow confined space entry procedures when applicable. Disconnect power before servicing or cleaning the unit, and ensure all maintenance is performed by qualified personnel.

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