Roof-Mount Blowers | 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.

Direct-Drive Upblast Roof-Mount Exhaust Fans

Direct-drive fans have fewer moving parts than belt-drive fans for less maintenance. These exhaust fans draw stagnant and humid air out through your roof and then expel it up and away from the roof surface. All fans have a disconnect switch to turn off the power for servicing.

Fans with a brushless motor have advanced electronic controls that allow them to precisely operate at wide range of speeds, making them more efficient, quieter, and longer lasting than fans with a standard motor.

Fans that cannot be sold to the listed areas are restricted by energy efficiency requirements.

Note: Airflow depends on the resistance created by ductwork. 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.

Fans
						Overall										Mounting Bases
	Blade Dia.	Airflow @ Static Pressure	Volume	Motor Speed, rpm	Power, hp	Dia.	Ht.	Base Wd.	Wt., lbs.	Max. Ambient Temp., °F	Housing Material	Specifications Met	Cannot Be Sold To		Each		Each
Open Dripproof Motor Enclosure
120V AC, Single Phase—Hardwire
1	9"	300 cfm @ 1/2 in. of H₂O 400 cfm @ 0 in. of H₂O	54 dBA @ 5 ft.	1,300	1/32	17 3/4"	14 1/2"	19"	40	120°	Aluminum	AMCA Certified, ETL Listed	__	0000000	0000000	0000000	0000000
1	11"	400 cfm @ 1/2 in. of H₂O 710 cfm @ 0 in. of H₂O	60 dBA @ 5 ft.	1,625	3/16	22"	18"	19"	43	300°	Aluminum	AMCA Certified, ETL Listed	__	0000000	000000	0000000	000000
1	11 3/4"	750 cfm @ 1/2 in. of H₂O 1,050 cfm @ 0 in. of H₂O	59 dBA @ 5 ft.	1,300	1/4	25 1/2"	25 1/4"	21"	67	300°	Aluminum	AMCA Certified, ETL Listed	__	0000000	000000	0000000	000000
1	12"	1,100 cfm @ 1/2 in. of H₂O 1,300 cfm @ 0 in. of H₂O	68 dBA @ 5 ft.	1,625	1/3	25 1/2"	25 1/4"	21"	50	300°	Aluminum	AMCA Certified, ETL Listed	__	0000000	000000	0000000	000000
1	13 3/4"	1,500 cfm @ 1/2 in. of H₂O 1,950 cfm @ 0 in. of H₂O	68 dBA @ 5 ft.	1,475	1/2	28 7/8"	27 1/4"	21"	78	300°	Aluminum	AMCA Certified, ETL Listed	__	0000000	000000	0000000	000000
1	16"	2,450 cfm @ 1/2 in. of H₂O 2,900 cfm @ 0 in. of H₂O	69 dBA @ 5 ft.	1,625	3/4	31 7/8"	30 1/2"	24 3/4"	80	300°	Aluminum	AMCA Certified, ETL Listed	__	0000000	00000000	0000000	000000
208-230V AC, Three Phase—Hardwire
1	18 3/4"	3,750 cfm @ 1/2 in. of H₂O 4,100 cfm @ 0 in. of H₂O	68 dB @ 5 ft.	1,150	2	37 3/8"	33 3/4"	28"	184	300°	Aluminum	AMCA Certified, ETL Listed	__	0000000	00000000	0000000	000000
1	20 3/4"	5,900 cfm @ 1/2 in. of H₂O 6,450 cfm @ 0 in. of H₂O	85 dBA @ 5 ft.	1,425	5	37 3/8"	33 1/4"	28"	221	300°	Aluminum	AMCA Certified, ETL Listed	__	0000000	00000000	0000000	000000
1	24"	7,000 cfm @ 1/2 in. of H₂O 7,750 cfm @ 0 in. of H₂O	72 dBA @ 5 ft.	900	3	41 7/8"	37 1/2"	33"	312	300°	Aluminum	AMCA Certified, ETL Listed	__	0000000	00000000	0000000	000000
1	30"	9,500 cfm @ 1/2 in. of H₂O 10,500 cfm @ 0 in. of H₂O	71 dBA @ 5 ft.	725	5	51 1/4"	44"	40"	497	300°	Aluminum	AMCA Certified, ETL Listed	__	0000000	00000000	0000000	000000
Totally Enclosed Motor Enclosure
460V AC, Three Phase—Hardwire
2	12"	1,150 cfm @ 1/2 in. of H₂O 1,800 cfm @ 0 in. of H₂O	71 dBA @ 5 ft.	3,450	1/3	18"	26 3/4"	22"	44	120°	Steel	__	__	0000000	00000000	00000000	000000
2	16"	3,050 cfm @ 0 in. of H₂O	70 dBA @ 5 ft.	1,750	1/3	22"	26 3/4"	26"	51	120°	Steel	__	__	0000000	00000000	00000000	000000
2	18"	3,900 cfm @ 0 in. of H₂O	69 dBA @ 5 ft.	1,750	3/4	24"	34 3/4"	28"	77	120°	Steel	__	__	0000000	00000000	00000000	000000
2	24"	7,400 cfm @ 0 in. of H₂O	66 dBA @ 5 ft.	1,750	3/4	30"	20 3/4"	36"	208	120°	Steel	__	__	0000000	00000000	0000000	000000
2	30"	7,300 cfm @ 1/2 in. of H₂O 11,700 cfm @ 0 in. of H₂O	66 dBA @ 5 ft.	1,150	2	36"	23 1/2"	42"	340	120°	Steel	__	CA	0000000	00000000	0000000	000000
2	36"	14,800 cfm @ 0 in. of H₂O	68 dBA @ 5 ft.	1,150	1	44"	26 3/4"	48"	370	120°	Steel	__	__	0000000	00000000	0000000	000000
2	42"	17,000 cfm @ 1/2 in. of H₂O 24,700 cfm @ 0 in. of H₂O	75 dBA @ 5 ft.	1,150	3	50"	29 1/2"	54"	471	120°	Steel	__	__	0000000	00000000	0000000	000000
2	48"	25,500 cfm @ 1/2 in. of H₂O 34,300 cfm @ 0 in. of H₂O	76 dBA @ 5 ft.	1,150	5	56"	38 3/4"	60"	650	120°	Steel	__	__	0000000	00000000	0000000	000000
2	54"	34,150 cfm @ 1/2 in. of H₂O 44,700 cfm @ 0 in. of H₂O	88 dBA @ 5 ft.	1,125	7 1/2	62"	63 1/2"	64 1/4"	628	120°	Steel	__	__	0000000	00000000	00000000	000000
2	60"	40,500 cfm @ 1/2 in. of H₂O 57,000 cfm @ 0 in. of H₂O	97 dBA @ 5 ft.	1,125	10	68"	63 1/2"	70 1/4"	640	120°	Steel	__	__	0000000	00000000	00000000	000000
Totally Enclosed Motor Enclosure—Brushless Motor
120V AC, Single Phase—Hardwire
1	11 3/4"	1,050 cfm @ 1/2 in. of H₂O 1,300 cfm @ 0 in. of H₂O	70 dBA @ 5 ft.	1,575	1/3	25 1/2"	25 1/4"	21"	64	300°	Aluminum	AMCA Certified, ETL Listed	__	0000000	000000	0000000	000000
1	13 3/4"	1,550 cfm @ 1/2 in. of H₂O 2,000 cfm @ 0 in. of H₂O	69 dBA @ 5 ft.	1,500	1/2	28 7/8"	27 1/4"	21"	71	300°	Aluminum	AMCA Certified, ETL Listed	__	0000000	00000000	0000000	000000
1	15 3/4"	2,850 cfm @ 1/2 in. of H₂O 3,200 cfm @ 0 in. of H₂O	72 dBA @ 5 ft.	1,550	1	31 7/8"	30 1/2"	24 3/4"	87	300°	Aluminum	AMCA Certified, ETL Listed	__	0000000	00000000	0000000	000000

Direct-Drive Downdraft Roof-Mount Exhaust Fans

Direct-drive fans have fewer moving parts than belt-drive fans for less maintenance. 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. All fans have a disconnect switch to turn off the power for servicing.

Fans with a brushless motor are more efficient than fans with a standard motor. They operate at a wide range of speeds for precise speed control and greater energy savings. They’re also quieter and have a longer lifespan because of their advanced electronic controls.

Note: Airflow depends on the resistance created by ductwork. 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.

Fans
						Overall									Mounting Bases
	Blade Dia.	Airflow @ Static Pressure	Volume	Motor Speed, rpm	Power, hp	Dia.	Ht.	Base Wd.	Wt., lbs.	Max. Ambient Temp., °F	Housing Material	Specifications Met		Each		Each
Totally Enclosed Motor Enclosure
120V AC, Single Phase—Hardwire
1	10"	60 cfm @ 1/2 in. of H₂O 500 cfm @ 0 in. of H₂O	Not Rated	1,500	1/30	18 5/16"	11 1/4"	19"	21	Not Rated	Aluminum	AMCA Certified, ETL Listed	0000000	0000000	0000000	0000000
1	12"	430 cfm @ 1/2 in. of H₂O 830 cfm @ 0 in. of H₂O	Not Rated	1,500	1/10	20 5/16"	11 3/4"	19"	30	Not Rated	Aluminum	AMCA Certified, ETL Listed	0000000	000000	0000000	000000
1	14"	520 cfm @ 1/2 in. of H₂O 1,100 cfm @ 0 in. of H₂O	Not Rated	1,100	1/6	27 5/16"	14 5/8"	21"	39	Not Rated	Aluminum	AMCA Certified, ETL Listed	0000000	000000	0000000	000000
1	18"	1,200 cfm @ 1/2 in. of H₂O 2,400 cfm @ 0 in. of H₂O	Not Rated	1,100	1/3	33 9/16"	16 3/8"	26"	60	Not Rated	Aluminum	AMCA Certified, ETL Listed	0000000	000000	0000000	000000
Totally Enclosed Motor Enclosure—Brushless Motor
120V AC, Single Phase—Hardwire
2	12"	1,000 cfm @ 1/2 in. of H₂O 1,300 cfm @ 0 in. of H₂O	66 dBA @ 5 ft.	1,575	1/3	26 1/4"	19 1/8"	21"	54	120°	Aluminum	AMCA Certified, ETL Listed	0000000	000000	0000000	000000
2	14"	1,900 cfm @ 1/2 in. of H₂O 2,300 cfm @ 0 in. of H₂O	68 dBA @ 5 ft.	1,525	1/2	29 3/4"	21 3/4"	21"	61	120°	Aluminum	AMCA Certified, ETL Listed	0000000	00000000	0000000	000000
2	16"	2,850 cfm @ 1/2 in. of H₂O 3,300 cfm @ 0 in. of H₂O	71 dBA @ 5 ft.	1,525	1	33 1/4"	23 3/8"	24"	74	120°	Aluminum	AMCA Certified, ETL Listed	0000000	00000000	0000000	000000
Open Dripproof Motor Enclosure
120V AC, Single Phase—Hardwire
2	9"	100 cfm @ 1/2 in. of H₂O 400 cfm @ 0 in. of H₂O	50 dBA @ 5 ft.	1,250	1/32	20 3/4"	14 1/2"	19"	40	120°	Aluminum	AMCA Certified, ETL Listed	0000000	000000	0000000	000000
2	11"	600 cfm @ 1/2 in. of H₂O 800 cfm @ 0 in. of H₂O	57 dBA @ 5 ft.	1,625	3/16	23 3/4"	16 1/4"	19"	37	Not Rated	Aluminum	AMCA Certified, ETL Listed	0000000	000000	0000000	000000
2	12"	950 cfm @ 1/2 in. of H₂O 1,250 cfm @ 0 in. of H₂O	62 dBA @ 5 ft.	1,625	1/4	26 1/4"	19 1/8"	21"	53	Not Rated	Aluminum	AMCA Certified, ETL Listed	0000000	000000	0000000	000000
2	14"	1,800 cfm @ 1/2 in. of H₂O 2,100 cfm @ 0 in. of H₂O	66 dBA @ 5 ft.	1,625	1/2	29 3/4"	21 3/4"	21"	56	Not Rated	Aluminum	AMCA Certified, ETL Listed	0000000	000000	0000000	000000
2	16"	2,600 cfm @ 1/2 in. of H₂O 3,100 cfm @ 0 in. of H₂O	70 dBA @ 5 ft.	1,450	3/4	33 1/4"	23 3/8"	24"	77	120°	Aluminum	AMCA Certified, ETL Listed	0000000	000000	0000000	000000
208/230V AC, Three Phase—Hardwire
3	19"	4,500 cfm @ 1/2 in. of H₂O 5,000 cfm @ 0 in. of H₂O	75 dBA @ 5 ft.	1,300	2	38 15/16"	32 3/4"	28"	189	120°	Aluminum	AMCA Certified, ETL Listed	0000000	00000000	0000000	000000
3	21"	6,200 cfm @ 1/2 in. of H₂O 6,700 cfm @ 0 in. of H₂O	82 dBA @ 5 ft.	1,400	5	38 15/16"	32 1/4"	28"	201	120°	Aluminum	AMCA Certified, ETL Listed	0000000	00000000	0000000	000000
3	24"	8,100 cfm @ 1/2 in. of H₂O 9,000 cfm @ 0 in. of H₂O	73 dBA @ 5 ft.	925	3	43 7/16"	37 1/4"	33"	288	120°	Aluminum	AMCA Certified, ETL Listed	0000000	00000000	0000000	000000
3	30"	10,400 cfm @ 1/2 in. of H₂O 11,500 cfm @ 0 in. of H₂O	69 dBA @ 5 ft.	700	5	52 13/16"	44"	40"	467	120°	Aluminum	AMCA Certified, ETL Listed	0000000	00000000	0000000	000000
3	36"	11,000 cfm @ 1/2 in. of H₂O 13,500 cfm @ 0 in. of H₂O	64 dBA @ 5 ft.	450	5	63 5/16"	49 1/2"	44"	532	120°	Aluminum	AMCA Certified, ETL Listed	0000000	00000000	0000000	000000

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
16"	2,800 cfm @ 1/2 in. of H₂O 3,200 cfm @ 0 in. of H₂O	70 dBA @ 5 ft.	1,145	3/4	33 11/16"	29 1/4"	26"	Aluminum	0000000	000000000	0000000	0000000
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	00000000	0000000	000000
208-230/460V AC, Three Phase—Hardwire
24"	6,900 cfm @ 1/2 in. of H₂O 7,750 cfm @ 0 in. of H₂O	73 dBA @ 5 ft.	875	2	44 1/4"	39 11/16"	33"	Aluminum	0000000	00000000	0000000	000000

Hazardous Location Upblast Roof-Mount Exhaust Fans

With a UL-listed motor, these fans can be used in hazardous environments with combustible gases and dust to draw stagnant and humid air out through your roof, forcing it up and away from its surface.

Direct-drive fans have fewer moving parts than belt-drive fans for less maintenance.

Belt-drive fans are quieter and last longer than direct-drive fans because their components can be replaced if they’re worn or damaged.

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

Direct-Drive Exhaust Fans

Fans
					Overall									Mounting Bases
Blade Dia.	Airflow @ Static Pressure	Volume	Motor Speed, rpm	Power, hp	Dia.	Ht.	Base Wd.	Wt., lbs.	Max. Ambient Temp., °F	Housing Material	Environmental Rating		Each		Each
Totally Enclosed Motor Enclosure
120/240V AC, Single Phase—Hardwire
24"	3,900 cfm @ 1/2 in. of H₂O 6,900 cfm @ 0 in. of H₂O	75 dBA @ 5 ft.	1,150	3/4	33"	25"	36"	340	100°	Steel	NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Divisions 1, 2 Groups E, F, G	0000000	000000000	0000000	0000000
30"	5,900 cfm @ 1/2 in. of H₂O 9,350 cfm @ 0 in. of H₂O	72 dBA @ 5 ft.	1,150	1	39"	28"	42"	370	100°	Steel	NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Divisions 1, 2 Groups E, F, G	0000000	00000000	0000000	000000
240/460V AC, Three Phase—Hardwire
36"	15,700 cfm @ 1/2 in. of H₂O 21,000 cfm @ 0 in. of H₂O	79 dBA @ 5 ft.	1,150	3	45"	31"	48"	480	100°	Steel	NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Divisions 1, 2 Groups E, F, G	0000000	00000000	0000000	000000
42"	19,400 cfm @ 1/2 in. of H₂O 25,300 cfm @ 0 in. of H₂O	80 dBA @ 5 ft.	1,150	3	51"	34"	54"	520	100°	Steel	NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Divisions 1, 2 Groups E, F, G	0000000	00000000	0000000	000000
48"	31,600 cfm @ 1/2 in. of H₂O 36,200 cfm @ 0 in. of H₂O	89 dBA @ 5 ft.	1,150	7 1/2	57"	37"	60"	670	100°	Steel	NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Divisions 1, 2 Groups E, F, G	0000000	00000000	0000000	000000

Belt-Drive Exhaust Fans

Fans
					Overall									Mounting Bases
Blade Dia.	Airflow @ Static Pressure	Volume	Motor Speed, rpm	Power, hp	Dia.	Ht.	Base Wd.	Wt., lbs.	Max. Ambient Temp., °F	Housing Material	Environmental Rating		Each		Each
Totally Enclosed Motor Enclosure
120/240V AC, Single Phase—Hardwire
24"	3,530 cfm @ 1/2 in. of H₂O 6,150 cfm @ 0 in. of H₂O	71 dBA @ 5 ft.	1,750	3/4	33"	25"	36"	340	100°	Steel	NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Divisions 1, 2 Groups E, F, G	0000000	000000000	0000000	0000000
30"	2,950 cfm @ 1/2 in. of H₂O 9,800 cfm @ 0 in. of H₂O	68 dBA @ 5 ft.	1,750	3/4	39"	28"	42"	410	100°	Steel	NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Divisions 1, 2 Groups E, F, G	0000000	00000000	0000000	000000
240/460V AC, Three Phase—Hardwire
36"	20,200 cfm @ 1/2 in. of H₂O 24,100 cfm @ 0 in. of H₂O	82 dBA @ 5 ft.	1,750	5	45"	31"	48"	590	100°	Steel	NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Divisions 1, 2 Groups E, F, G	0000000	00000000	0000000	000000
42"	22,400 cfm @ 1/2 in. of H₂O 27,800 cfm @ 0 in. of H₂O	78 dBA @ 5 ft.	1,750	5	51"	34"	54"	720	100°	Steel	NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Divisions 1, 2 Groups E, F, G	0000000	00000000	0000000	000000
48"	28,600 cfm @ 1/2 in. of H₂O 36,700 cfm @ 0 in. of H₂O	80 dBA @ 5 ft.	1,750	5	57"	37"	60"	840	100°	Steel	NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Divisions 1, 2 Groups E, F, G	0000000	00000000	0000000	000000

Direct-Drive Exhaust Fans

With fewer moving parts than belt-drive fans, these direct-drive exhaust fans require less maintenance. They have a built-in grease pan to collect waste while cooking. Mount these fans directly to your roof with the attached mounting brackets. They meet UL standards for ventilation in residential, commercial, and institutional kitchens.

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

Totally Enclosed Motor Enclosure
Blade Dia.	Airflow @ Static Pressure	Volume	Motor Speed, rpm	No. of Speeds	Power, hp	Overall Ht.	Base Wd.	Max. Ambient Temp., °F	Housing Material	Blade Material	Features	Specifications Met		Each
120V AC, Single Phase—Hardwire
12"	1,250 cfm @ 1/2 in. of H₂O 1,500 cfm @ 0 in. of H₂O	64 dB @ 5 ft.	1,725	Variable	1	51 1/8"	29 1/2"	350°	Steel	Aluminum	Grease Pan	UL 705, UL 762, ULC-S645, ETL Listed	0000000	000000000
14"	2,100 cfm @ 1/2 in. of H₂O 2,500 cfm @ 0 in. of H₂O	66 dB @ 5 ft.	1,650	Variable	1	55 3/8"	31"	350°	Steel	Aluminum	Grease Pan	UL 705, UL 762, ULC-S645, ETL Listed	0000000	00000000
Open Dripproof Motor Enclosure
208V AC, Three Phase—Hardwire
16"	3,000 cfm @ 1/2 in. of H₂O 3,500 cfm @ 0 in. of H₂O	71 dB @ 5 ft.	1,650	Variable	1 1/2	59 3/4"	32 5/8"	350°	Steel	Aluminum	Grease Pan	UL 705, UL 762, ULC-S645, ETL Listed	0000000	00000000
19"	3,800 cfm @ 1/2 in. of H₂O 4,500 cfm @ 0 in. of H₂O	76 dB @ 5 ft.	1,175	Variable	1 1/2	66 1/8"	37 1/2"	350°	Steel	Aluminum	Grease Pan	UL 705, UL 762, ULC-S645, ETL Listed	0000000	00000000
21"	5,000 cfm @ 1/2 in. of H₂O 5,500 cfm @ 0 in. of H₂O	77 dB @ 5 ft.	1,275	Variable	3	71 7/8"	38 1/4"	350°	Steel	Aluminum	Grease Pan	UL 705, UL 762, ULC-S645, ETL Listed	0000000	00000000
25"	5,500 cfm @ 1/2 in. of H₂O 6,500 cfm @ 0 in. of H₂O	72 dB @ 5 ft.	900	Variable	3	80 3/8"	49 1/4"	350°	Steel	Steel	Grease Pan	UL 705, UL 762, ULC-S645, ETL Listed	0000000	00000000
31"	7,000 cfm @ 1/2 in. of H₂O 8,500 cfm @ 0 in. of H₂O	72 dB @ 5 ft.	675	Variable	5	85 7/8"	52 1/4"	350°	Steel	Steel	Grease Pan	UL 705, UL 762, ULC-S645, ETL Listed	0000000	00000000
37"	12,000 cfm @ 1/2 in. of H₂O 14,000 cfm @ 0 in. of H₂O	72 dB @ 5 ft.	575	Variable	7 1/2	93 1/4"	59"	350°	Steel	Steel	Grease Pan	UL 705, UL 762, ULC-S645, ETL Listed	0000000	00000000