20" Blade Diameter Fans | McMaster-Carr

Measured in decibels (dB), volume ratings indicate how much noise equipment makes. Some common volume levels include a whisper @ 20 dB, a refrigerator @ 40 dB, a conversation @ 60 dB, and a light machine shop @ 90 dB. OSHA recommends hearing protection for exposure to 80 dB and greater.

Economy Wall-Mount Fans

Position these wall-mount fans to direct air where it’s needed. All of these fans have a direct-drive motor, which has fewer moving parts than belt-drive motors for less maintenance. They also have a totally enclosed motor enclosure, which can be used in dirty and dusty environments.

Fans															Replacement Motors
Blade Dia.	Airflow, cfm	Volume	Motor Speed, rpm	No. of Speeds	Power, hp	Current, A	Cord Lg., ft.	Blade Material	Guard Material	Mount. Fasteners Included	Mount. Hole Dia.	Specifications Met		Each		Each
120V AC, Single Phase—Three Prong Plug
Non-Oscillating
20"	3,600	52 dBA @ 15 ft.	1,500	3	1/6	1.6	9	Steel	Powder-Coated Steel	No	3/8"	ETL Listed	0000000	0000000	0000000	000000
Oscillating
20"	4,100	63 dBA @ 15 ft.	1,075	2	1/4	3.0	10	Aluminum	Powder-Coated Steel	No	3/8"	__	00000000	000000	000000	00

Premium Wall-Mount Fans

With Mounting Bracket

With a ball-bearing motor and cupped fan blades, these fans last longer and focus airflow better than economy fans. All have a direct-drive motor, which has fewer moving parts than belt-drive motors for less maintenance. They also have a totally enclosed motor enclosure, which can be used in dirty and dusty environments.

120V AC, Single Phase—Three Prong Plug
Blade Dia.	Airflow, cfm	Volume	Motor Speed, rpm	No. of Speeds	Power, hp	Current, A	Cord Lg., ft.	Blade Material	Guard Material	Mount. Fasteners Included	Mount. Hole Dia.	Includes		Each
Non-Oscillating
20"	3,100	65 dB @ 5 ft.	1,100	3	1/5	1.6	15	Aluminum	Chrome-Plated Steel	No	7/16"	Mounting Bracket	0000000	0000000
Oscillating
20"	3,100	67 dB @ 5 ft.	1,100	3	1/5	1.6	15	Aluminum	Chrome-Plated Steel	No	7/16"	Mounting Bracket	0000000	000000

Replacement Cord for Fans with Chrome-Plated Steel Guards

0000000

Each

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Economy Pedestal Fans

Place these pedestal fans to circulate air where it’s needed. A direct-drive motor means they have fewer moving parts than fans with belt-drive motors for less maintenance. They also have a totally enclosed motor enclosure, which can be used in dirty and dusty environments.

120V AC, Single Phase—Three Prong Plug
Blade Dia.	Airflow, cfm	Volume	Motor Speed, rpm	No. of Speeds	Power, hp	Current, A	Ht., ft.	Cord Lg., ft.	Blade Material	Guard Material	Pedestal Material	Pedestal Color	Specifications Met		Each
Non-Oscillating
20"	3,600	52 dBA @ 15 ft.	1,500	3	1/6	1.6	4-5	9	Steel	Powder-Coated Steel	Powder-Coated Steel	Black	ETL Listed	0000000	0000000

Replacement Motor for 1,500-rpm Non-Oscillating Fans

0000000

Each

000000

Premium Pedestal Fans

120V AC, Single Phase—Three Prong Plug
Blade Dia.	Airflow, cfm	Volume	Motor Speed, rpm	No. of Speeds	Power, hp	Current, A	Ht., ft.	Cord Lg., ft.	Blade Material	Guard Material	Pedestal Material	Pedestal Color	Specifications Met		Each
Non-Oscillating
20"	3,100	62 dB @ 5 ft.	1,125	3	1/5	1.6	3-5	15	Aluminum	Chrome-Plated Steel	Powder-Coated Steel	Black	C-UL Listed, UL Listed	0000000	0000000

Replacement Cord for 120V AC Fans

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Each

000000

High-Visibility Pedestal Fans

A bright yellow guard makes these fans easy to spot. All fans have a direct-drive motor, which has fewer moving parts than belt-drive motors for less maintenance.

Energy-saving modules (sold separately) power off the fan when it isn’t in use to reduce motor wear and dirt buildup on fan parts.

Fans

20" and 36" Blade Dia.

120V AC, Single Phase—Three Prong Plug
Blade Dia.	Airflow, cfm	Volume	Motor Speed, rpm	No. of Speeds	Power, hp	Current, A	Ht.	Cord Lg., ft.	Motor Enclosure Type	Blade Material	Guard Material	Pedestal Material	Pedestal Color		Each
Non-Oscillating
20"	4,200	60 dB @ 5 ft.	1,100	2	1/4	2.4	5 ft.	18	Open	Galvanized Steel	Powder-Coated Steel	Powder-Coated Steel	Yellow	0000000	0000000

Energy-Saving Modules

For Fan Blade Dia.	Run Time, hrs.	Specifications Met		Each
20"	4, 5, 6, 10	ETL Listed	0000000	000000

Economy Ceiling-Mount Fans

Shown With Extension Pipe (Not Included)

Hanging from the ceiling, these fans direct air where it's needed. A direct-drive motor means these fans have fewer moving parts than fans with belt-drive motors for less maintenance. A totally enclosed motor enclosure means these fans can be used in dirty and dusty environments. Threaded extension pipe for mounting is not included. These fans cannot be sold to California due to local energy efficiency requirements.

										Mounting
Blade Dia.	Airflow, cfm	Volume	Motor Speed, rpm	No. of Speeds	Power, hp	Current, A	Cord Lg., ft.	Blade Material	Guard Material	Fasteners Included	Hole Dia.	Required Pipe Size	Specifications Met	Cannot Be Sold To		Each
120V AC, Single Phase—Three Prong Plug
Non-Oscillating
20"	3,600	52 dBA @ 15 ft.	1,500	3	1/6	1.6	9	Steel	Powder-Coated Steel	No	3/8"	1 1/2	ETL Listed	CA	0000000	0000000

Replacement Motor for 1,500-rpm Fans

0000000

Each

000000

Economy Beam-Mount Fans

Attach these fans to beams to direct air where it’s needed. They have a direct-drive motor, which has fewer moving parts than belt-drive motors for less maintenance. They also have a totally enclosed motor enclosure, which can be used in dirty and dusty environments.

Fans															Replacement Motors
Blade Dia.	Airflow, cfm	Volume	Motor Speed, rpm	No. of Speeds	Power, hp	Current, A	Cord Lg., ft.	Blade Material	Guard Material	For Beam Wd.	Mounting Fasteners Included	Specifications Met		Each		Each
120V AC, Single Phase—Three Prong Plug
Non-Oscillating
20"	3,600	52 dBA @ 15 ft.	1,500	3	1/6	1.6	9	Steel	Powder-Coated Steel	4"-14"	Yes	ETL Listed	0000000	0000000	0000000	000000

Wall-Mount Misting Fans

Connect these fans to a hose to produce a fine mist. Because they are direct-drive fans, they have fewer moving parts than belt-drive fans and require less maintenance.

For technical drawings and 3-D models, click on a part number.

							Inlet
Blade Dia.	Airflow, cfm	Volume	Motor Speed, rpm	No. of Speeds	Power, hp	Current, A	Hose Size	Thread Type	Cord Lg., ft.	Blade Material	Guard Material	Mount. Fasteners Included	Mount. Hole Dia.		Each
120V AC, Single Phase—Three Prong Plug
Non-Oscillating
20"	12,000	68 dB @ 10 ft.	1,100	2	1/4	1.6	1/4	GHT	10	Aluminum	Powder-Coated Steel	No	3/8"	0000000	0000000

Office Floor Fans

Fan

Tilt the head of these fans to direct air where it's needed.

				Overall
Blade Dia.	Airflow, cfm	No. of Speeds	Current, A	Ht.	Wd.	Dp.	Cord Lg., ft.	Blade Material	Guard Material	Specifications Met		Each
120V AC, Single Phase—Three Prong Plug
Non-Oscillating, Tilting
20"	3,600	3	1.6	25"	26"	13"	9	Steel	Steel	ETL Listed	00000000	0000000

Box Fans

Position these fans in a window, set them on the floor, or attach them to an optional box fan stand.

				Overall
Blade Dia.	Airflow, cfm	No. of Speeds	Current, A	Ht.	Wd.	Dp.	Cord Lg., ft.	Housing Material	Blade Material	Guard Material	Specifications Met		Each
120V AC, Single Phase—Three Prong Plug
Non-Oscillating
20"	2,100	3	0.9	23"	21"	6"	6	Steel	Plastic	Plastic	ETL Listed	0000000	000000

Wall-Mount Office Fans

Keep cool with these personal-size wall-mount fans. The fan head tilts to direct air where it's needed.

For technical drawings and 3-D models, click on a part number.

				Overall
Blade Dia.	Airflow, cfm	No. of Speeds	Current, A	Ht.	Wd.	Dp.	Cord Lg., ft.	Blade Material	Guard Material	Mount. Fasteners Included	Mount. Hole Dia.	Specifications Met		Each
120V AC, Single Phase—Three Prong Plug
Non-Oscillating, Tilting
20"	1,700	3	1.3	29 1/2"	22"	20 1/2"	9	Aluminum	Steel	No	3/8"	UL Listed, C-UL Listed	0000000	0000000

Window-Mount Office Fans

Draw fresh air in or push stale air out of your windows. Reverse airflow with the flip of a switch. Side panels expand to fit the width of your window.

				Overall					Blade
Blade Dia.	Airflow, cfm	No. of Speeds	Current, A	Ht.	Wd.	Dp.	Cord Lg., ft.	Housing Material	Material	Rotation	Guard Material	Specifications Met		Each
120V AC, Single Phase—Three Prong Plug
Non-Oscillating
20"	3,500	3	1.4	26"	27"-38"	10"	7	Plastic	Steel	Reversible	Steel	ETL Listed	0000000	0000000

Fan Guards

These two-piece guards attach to NEMA frame motors.

For technical drawings and 3-D models, click on a part number.

For Blade Dia.	Guard Dia.	For Motor Frame Size	Guard Material		Each
18", 20"	23"	NEMA 42Y	Chrome-Plated Steel	000000	0000000

Dust-Resistant Direct-Drive Wall-Mount Exhaust Fans

Better suited for dirty, dusty, and damp environments than standard direct-drive fans, these have a totally enclosed motor enclosure. Direct-drive fans have fewer moving parts than belt-drive fans for less maintenance. Use these fans to draw stagnant and humid air out of a room or area.

Collars and louvers are sold separately. Use a collar to connect a wall-mount exhaust fan to a louver.

For technical drawings and 3-D models, click on a part number.

							Overall
	Blade Dia.	Airflow, cfm	Volume	Motor Speed, rpm	No. of Speeds	Power, hp	Ht.	Wd.	Dp.	Wt., lbs.	Max. Ambient Temperature	Frame Material	Blade Material	Specifications Met		Each
120V AC, Single Phase—Hardwire
3	20"	2,925	Not Rated	1,140	2	1/4	23"	23"	12"	35	100° F	Steel	Aluminum	UL Recognized Component	0000000	0000000

Direct-Drive Wall-Mount Exhaust Fans

Direct-drive fans have fewer moving parts than belt-drive fans for less maintenance. Use these fans to draw stagnant and humid air out of a room or area.

Fans with an open dripproof motor enclosure are for relatively clean, dry, indoor locations. Use a collar (sold separately) to connect these fans to a louver.

Fans with louvers create a weather-tight seal when they're turned off. The louvers open automatically on startup and spring closed when not in use.

Weather hoods (sold separately) help extend the life of your exhaust fan by protecting it from harsh weather, such as severe wind, and debris.

For technical drawings and 3-D models, click on a part number.

120V AC, Single Phase (Hardwire)—Open Dripproof Motor Enclosure

Fans
						Overall								Collars
Blade Dia.	Airflow, cfm	Volume	Motor Speed, rpm	No. of Speeds	Power, hp	Ht.	Wd.	Dp.	Frame Material	Blade Material	Specifications Met		Each		Each
20"	4,100	64 dBA @ 5 ft.	1,075	1	1/2	24 1/8"	24 1/8"	10 5/8"	Powder-Coated Steel	Aluminum	UL Listed, C-UL Listed	0000000	0000000	0000000	0000000

120V AC, Single Phase (Hardwire)—Totally Enclosed Motor Enclosure

						Overall					Mounting Hole
Blade Dia.	Airflow, cfm	Volume	Motor Speed, rpm	No. of Speeds	Power, hp	Ht.	Wd.	Dp.	Blade Material	Guard Material	Dia.	Location	No. of		Each
20"	2,900	65 dBA @ 5 ft.	1,125	2	1/4	25 1/2"	25 1/2"	8 3/4"	Aluminum	Steel	1/4"	Guard	4	0000000	0000000

120/230V AC, Single Phase (Hardwire)—Totally Enclosed Motor Enclosure

Fans (Includes Louvers)
						For Opening		Overall					Mounting Hole					Weather Hoods
Blade Dia.	Airflow, cfm	Volume	Motor Speed, rpm	No. of Speeds	Power, hp	Ht.	Wd.	Ht.	Wd.	Dp.	Frame Material	Blade Material	Dia.	Location	No. of		Each		Each
20"	3,100	Not Rated	1,725	1	1/3	22"	22"	23 1/2"	23 1/2"	18 3/4"	Galvanized Steel	Aluminum	3/16"	Frame	4	0000000	0000000	00000000	0000000

Light Duty Direct-Drive Wall-Mount Exhaust Fans with Louvers

These light duty fans are designed for use without duct. They come complete with a movable-blade louver. The louvers are gravity operated so they open only when air flows through them, which prevents backdrafts. Direct-drive fans have fewer moving parts than belt-drive fans for less maintenance. Use these fans to draw stagnant and humid air out of a room or area. All have a totally enclosed motor enclosure, which can be used in dirty, dusty, and damp environments.

					For Opening		Overall
Blade Dia.	Airflow, cfm	Motor Speed, rpm	No. of Speeds	Power, hp	Ht.	Wd.	Ht.	Wd.	Dp.	Max. Ambient Temperature	Control Type	Frame Material	Blade Material	Mount. Fasteners Included	Mount. Hole Dia.	Specifications Met		Each
120V AC, Single Phase—Hardwire
20"	2,925	1,140	2	1/4	20 1/2"	20 1/2"	23"	23"	9 1/2"	100° F	Pull Switch	Steel	Aluminum	No	5/16"	UL Recognized Component	00000000	0000000
120V AC, Single Phase—Three-Prong Plug
20"	2,925	1,140	2	1/4	20 1/2"	20 1/2"	23"	23"	9 1/2"	100° F	Pull Switch	Steel	Aluminum	No	5/16"	UL Recognized Component	00000000	000000
230/460V AC, Three Phase—Hardwire
20"	2,820	1,720	1	1/3	20 1/2"	20 1/2"	23"	23"	12 1/2"	100° F	__	Steel	Aluminum	No	1/4"	UL Recognized Component	00000000	000000

Corrosion-Resistant Direct-Drive Wall-Mount Exhaust Fans with Louvers

Rust won't be a problem with the durable plastic housing and louvers on these fans. The fans come complete with a movable-blade louver. The louvers are gravity operated so they open only when air flows through them, which prevents backdrafts. Direct-drive fans have fewer moving parts than belt-drive fans for less maintenance. Use these fans to draw stagnant and humid air out of a room or area. All have a totally enclosed motor enclosure, which can be used in dirty, dusty, and damp environments.

For technical drawings and 3-D models, click on a part number.

					For Opening		Overall
Blade Dia.	Airflow, cfm	Motor Speed, rpm	No. of Speeds	Power, hp	Ht.	Wd.	Ht.	Wd.	Dp.	Max. Ambient Temperature	Housing Material	Blade Material		Each
120/230V AC, Single Phase—Hardwire
20"	3,100	1,700	1	1/3	25 3/4"	25 3/4"	28 1/4"	28 3/4"	25 1/2"	104° F	Fiberglass	Polypropylene Plastic	0000000	0000000

Exterior-Wall-Mount Exhaust Fans

Fan with Totally Enclosed Motor Enclosure

Good when you don't have room to mount an exhaust fan inside your facility, these fans attach to openings in outside walls. Use them to draw stagnant and humid air out of a room or area.

Direct-drive fans have fewer moving parts than belt-drive fans, so they’re easier to maintain. Fans with a totally enclosed motor enclosure can be used in dirty, dusty, and damp environments. They mount through the wall, so you'll need to cut a hole on the inside of the wall as well.

Note: Airflow depends on the resistance created by louvers, filters, and ductwork in your system. This resistance, known as static pressure (SP), is measured in inches of water.

For technical drawings and 3-D models, click on a part number.

					For Opening			Overall
Blade Dia.	Airflow @ Static Pressure	Drive Type	Motor Speed, rpm	Power, hp	Dia.	Ht.	Wd.	Dia.	Dp.	Motor Enclosure Type	Includes		Each
120/230V AC, Single Phase—Hardwire
20"	4,000 cfm @ 0.2 in. of H₂O 5,000 cfm @ 0 in. of H₂O	Direct	1,725	1/3	20"	25 3/4"	25 3/4"	29 1/2"	40"	Totally Enclosed	Louvers	0000000	000000000

Exhaust-Side Guards for Wall-Mount Exhaust Fans

Protect the exhaust side of your wall-mount exhaust fans from debris.

For technical drawings and 3-D models, click on a part number.

	Overall
For Blade Dia.	Ht.	Wd.	Dp.	Material	Mounting Fasteners Included		Each
20", 24"	27 3/4"	27 3/4"	6"	Galvanized Steel	Yes	00000000	0000000

Supply-Side Guards for Wall-Mount Exhaust Fans

Protect the supply side of your wall-mount exhaust fans from debris.

For technical drawings and 3-D models, click on a part number.

	Overall
For Blade Dia.	Ht.	Wd.	Dp.	Material	Mounting Fasteners Included		Each
20", 24"	30 1/2"	30 1/2"	25"	Galvanized Steel	Yes	00000000	0000000

Belt-Drive Downdraft Roof-Mount Exhaust Fans

Belt-drive fans are quieter and have a longer life span than direct-drive fans because components can be replaced if worn or damaged. More economical than upblast roof-mount exhaust fans, these draw stagnant and humid air out through your roof and then direct it back toward the roof.

Note: Airflow depends on the resistance created by ductwork. This resistance, known as static pressure (SP), is measured in inches of water.

Fans
					Overall						Mounting Bases
Blade Dia.	Airflow @ Static Pressure	Volume	Motor Speed, rpm	Power, hp	Dia.	Ht.	Base Wd.	Housing Material		Each		Each
Open Dripproof Motor Enclosure
120/208-230V AC, Single Phase—Hardwire
20"	4,900 cfm @ 1/2 in. of H₂O 5,400 cfm @ 0 in. of H₂O	74 dBA @ 5 ft.	1,080	1 1/2	38 1/4"	31 3/4"	30"	Aluminum	0000000	000000000	0000000	0000000

Hazardous Location Exhaust Fans

These fans have a motor that is UL listed for hazardous environments. Use them to draw stagnant and humid air out of a room or area.

Direct-drive fans have fewer moving parts than belt-drive fans for less maintenance. Add a collar (sold separately) to connect a wall-mount fan these fans to a louver.

For technical drawings and 3-D models, click on a part number.

Fans
							Overall								Collars
Blade Dia.	Airflow, cfm	Volume	Drive Type	Motor Speed, rpm	No. of Speeds	Power, hp	Ht.	Wd.	Dp.	Housing Material	Blade Material	Environmental Rating		Each		Each
120/230V AC, Single Phase—Hardwire
20"	4,800	73 dBA @ 5 ft.	Direct	1,725	1	1/2	24 1/8"	24 1/8"	19 1/2"	Steel	Aluminum	NEC Class I Divisions 1, 2 Group D; NEC Class II Divisions 1, 2 Groups F, G	0000000	000000000	0000000	0000000
230/460V AC, Three Phase—Hardwire
20"	4,800	73 dBA @ 5 ft.	Direct	1,725	1	1/2	24 1/8"	24 1/8"	19 1/2"	Steel	Aluminum	NEC Class I Divisions 1, 2 Group D; NEC Class II Divisions 1, 2 Groups F, G	0000000	00000000	0000000	000000

Fan Blades

Keyway

Replace worn and damaged fan blades. Use the included set screw or shaft collar to fasten a blade to your fan's shaft. Fan blades with a keyway are for use on motors with a keyed shaft. For difficult-to-remove hubs and fan blades, use fan blade pullers (not included).

Styles A-C blades are for use in low-airflow applications.

Style D blades are sturdier than Styles A-C blades and produce higher airflow.

Style E blades are cupped to create a focused stream of high airflow.

For technical drawings and 3-D models, click on a part number.

	Blade
Style	Dia.	Number of	Pitch	Rotation	For Maximum Motor Speed, rpm	Airflow @ Max. Motor Speed, cfm	Power @ Max. Motor Speed, hp	Hub Material	Includes		Each
Aluminum
For Round Shaft with 1/2" Diameter
B	20"	3	22°	Clockwise	1,800	4,200	0.5	Steel	Shaft Collar	00000000	000000
B	20"	3	30°	Clockwise	1,800	5,840	0.83	Steel	Shaft Collar	00000000	00000
B	20"	5	27°	Clockwise	1,800	6,040	1.29	Steel	Shaft Collar	00000000	000000
C	20"	3	23°	Clockwise	1,800	3,600	0.47	Steel	Shaft Collar	00000000	00000
C	20"	4	23°	Clockwise	1,800	3,500	0.32	Steel	Shaft Collar	00000000	000000
For Round Shaft with 5/8" Diameter
D	20"	3	__	Clockwise	1,100	3,100	0.2	Aluminum	Set Screw	0000000	000000
For Keyed Shaft with 5/8" Diameter
B	20"	3	22°	Clockwise	1,800	4,200	0.5	Steel	Shaft Collar	00000000	00000
B	20"	3	30°	Clockwise	1,800	5,840	0.83	Steel	Shaft Collar	00000000	00000
B	20"	5	27°	Clockwise	1,800	6,040	1.29	Steel	Shaft Collar	00000000	000000
C	20"	3	23°	Clockwise	1,800	3,600	0.47	Steel	Shaft Collar	00000000	00000
C	20"	4	23°	Clockwise	1,800	3,500	0.32	Steel	Shaft Collar	00000000	000000
Galvanized Steel
For Keyed Shaft with 1/2" Diameter
E	20"	4	36°	Clockwise	1,925	5,600	1	Steel	Shaft Collar	000000000	000000
For Keyed Shaft with 5/8" Diameter
E	20"	4	36°	Clockwise	1,925	5,600	1	Steel	Shaft Collar	000000000	000000
For Keyed Shaft with 7/8" Diameter
E	20"	4	36°	Clockwise	1,925	5,600	1	Steel	Shaft Collar	000000000	000000
For Keyed Shaft with 1" Diameter
E	20"	4	36°	Clockwise	1,925	5,600	1	Steel	Shaft Collar	000000000	000000
For Keyed Shaft with 1 3/16" Diameter
E	20"	4	36°	Clockwise	1,925	5,600	1	Steel	Shaft Collar	000000000	000000
For Keyed Shaft with 1 3/8" Diameter
E	20"	4	36°	Clockwise	1,925	5,600	1	Steel	Shaft Collar	000000000	000000

High-Output Fan Blades

Keyway

Generate at least 25% greater airflow than standard fan blades. Use these blades to replace worn and damaged fan blades. The fan blades with a keyway are for use on motors with a keyed shaft. For difficult-to-remove hubs and fan blades, use fan blade pullers (not included).

Style B 12"-24" dia. blades use the included set screw to fasten a blade to your fan's shaft. The 30" and 36" dia. blades require an SH style quick-disconnect bushing (not included).

For technical drawings and 3-D models, click on a part number.

	For Shaft		Blade
Style	Dia.	Shape	Dia.	Number of	Pitch	Rotation	For Maximum Motor Speed, rpm	Airflow @ Max. Motor Speed, cfm	Power @ Max. Motor Speed, hp	Hub Material	Includes		Each
Plastic
B	5/8"	Keyed	20"	6	35°	Counterclockwise	3,800	11,900	6.1	Aluminum	Set Screw	0000000	000000