Power Vents | 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.

Wall-Vent Flue-Gas Exhausters

Exhauster

Often used for electric-to-gas conversions and renovations, these exhausters allow gas- or oil-fired equipment to be vented through a sidewall rather than a chimney. A thermostat signal starts the exhauster and a sensor ensures proper draft prior to operation. Exhausters have an open dripproof motor enclosure for relatively clean, dry, indoor locations. Use a reducer to vent through ducts with diameters up to 2" wider than the exhauster.

A hood (sold separately) is required for the exterior of the sidewall.

Exhausters								Hoods
For Furnace Heating Capacity, Btu/hr.	For Duct Dia.	Motor Speed, rpm	Max. Temp., °F	Housing Material	Mounting Fasteners Included		Each		Each
24/120V AC—Hardwire
150,000-300,000	4"	3,000	600°	Steel	Yes	000000	0000000	0000000	0000000
300,000-600,000	6"	3,000	600°	Steel	Yes	000000	000000	0000000	000000

Inline Flue-Gas Exhausters

Increase airflow through exhaust duct to improve furnace performance. Create a cutout in your duct, insert the blower wheel, and mount the housing to the duct. All have an open dripproof motor enclosure for relatively clean, dry, indoor locations. They cannot be used for sidewall venting applications.

Optional safety switch (sold separately) prevents furnace from firing if exhausters fail.

	For Cutout
For Duct Dia.	Ht.	Wd.	Motor Speed, rpm	Max. Temp., °F	Housing Material	Mounting Fasteners Included		Each
120V AC—Hardwire
3"-6"	2 5/8"	7 5/8"	1,550	575°	Steel	Yes	0000000	0000000
5"-8"	3 1/8"	8 5/8"	1,550	575°	Steel	Yes	0000000	000000
8"-12"	4"	12 3/4"	1,725	575°	Steel	Yes	0000000	000000

Optional Safety Switches

Housing Material	Mounting Fasteners Included		Each
Zinc-Plated Steel	Yes	0000000	0000000

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.

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.	Wt., lbs.	Max. Ambient Temperature	Housing Material	Specifications Met		Each		Each
Open Dripproof Motor Enclosure
120V AC, Single Phase—Hardwire
1	11"	400 cfm @ 1/2 in. of H₂O 710 cfm @ 0 in. of H₂O	33 dB @ 15 ft.	1,625	3/16	22"	18"	19"	43	300° F	Aluminum	ETL Listed	0000000	0000000	0000000	0000000
1	12"	1,100 cfm @ 1/2 in. of H₂O 1,300 cfm @ 0 in. of H₂O	43 dB @ 15 ft.	1,625	1/3	25 1/2"	25 1/4"	21"	50	300° F	Aluminum	ETL Listed	0000000	000000	0000000	000000
1	16"	2,450 cfm @ 1/2 in. of H₂O 2,900 cfm @ 0 in. of H₂O	47 dB @ 15 ft.	1,625	3/4	31 7/8"	30 1/2"	24 3/4"	80	300° F	Aluminum	ETL Listed	0000000	000000	0000000	000000
Totally Enclosed Motor Enclosure
460V AC, Three Phase—Hardwire
2	24"	7,400 cfm @ 0 in. of H₂O	66 dB @ 15 ft.	1,750	3/4	30"	20 3/4"	36"	208	122° F	Steel	__	0000000	00000000	0000000	000000
2	30"	7,300 cfm @ 1/2 in. of H₂O 11,700 cfm @ 0 in. of H₂O	66 dB @ 15 ft.	1,150	2	36"	23 1/2"	42"	340	122° F	Steel	__	0000000	00000000	0000000	000000
2	36"	14,800 cfm @ 0 in. of H₂O	68 dB @ 15 ft.	1,150	1	44"	26 3/4"	48"	370	122° F	Steel	__	0000000	00000000	0000000	000000
2	42"	17,000 cfm @ 1/2 in. of H₂O 24,700 cfm @ 0 in. of H₂O	75 dB @ 15 ft.	1,150	3	50"	29 1/2"	54"	471	122° F	Steel	__	0000000	00000000	0000000	000000
2	48"	25,500 cfm @ 1/2 in. of H₂O 34,300 cfm @ 0 in. of H₂O	76 dB @ 15 ft.	1,150	5	56"	38 3/4"	60"	650	122° F	Steel	__	0000000	00000000	0000000	000000

Belt-Drive Upblast 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. 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 are AMCA (Air Movement and Control Association) rated.

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.	Max. Temp., °F	Housing Material	Specifications Met		Each		Each
Open Dripproof Motor Enclosure
120/208-230V AC, Single Phase—Hardwire
19"	3,000 cfm @ 1/2 in. of H₂O 3,725 cfm @ 0 in. of H₂O	45 dB @ 15 ft.	1,725	3/4	39 3/8"	33 3/4"	28"	300°	Aluminum	AMCA Rated, ETL Listed	0000000	000000000	0000000	0000000
208-230/460V AC, Three Phase—Hardwire
24"	4,900 cfm @ 1/2 in. of H₂O 6,250 cfm @ 0 in. of H₂O	46 dB @ 15 ft.	1,700	1 1/2	43 3/8"	37 1/2"	33"	300°	Aluminum	AMCA Rated, ETL Listed	0000000	00000000	0000000	000000
30"	8,250 cfm @ 1/2 in. of H₂O 9,500 cfm @ 0 in. of H₂O	49 dB @ 15 ft.	1,725	3	52 3/4"	40"	40"	300°	Aluminum	AMCA Rated, 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.

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.	Wt., lbs.	Max. Ambient Temperature	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	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	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	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	ETL Listed	0000000	000000	0000000	000000
Open Dripproof Motor Enclosure
120V AC, Single Phase—Hardwire
2	11"	600 cfm @ 1/2 in. of H₂O 800 cfm @ 0 in. of H₂O	37 dB @ 15 ft.	1,625	3/16	23 3/4"	16 1/4"	19"	37	Not Rated	Aluminum	ETL Listed	0000000	000000	0000000	000000
2	12"	950 cfm @ 1/2 in. of H₂O 1,250 cfm @ 0 in. of H₂O	41 dB @ 15 ft.	1,625	1/4	26 1/4"	19 1/8"	21"	53	Not Rated	Aluminum	ETL Listed	0000000	000000	0000000	000000
2	14"	2,100 cfm @ 0 in. of H₂O 1,800 cfm @ 1/2 in. of H₂O	45 dB @ 15 ft.	1,625	1/2	29 3/4"	21 3/4"	21"	56	Not Rated	Aluminum	ETL Listed	0000000	000000	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. All fans have a disconnect switch to turn off the power for servicing.

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	Specifications Met		Each		Each
Open Dripproof Motor Enclosure
120/208-230V AC, Single Phase—Hardwire
16"	1,950 cfm @ 1/2 in. of H₂O 2,600 cfm @ 0 in. of H₂O	43 dB @ 15 ft.	1,730	1/2	33 1/4"	30 5/8"	24 3/4"	Aluminum	ETL Listed	0000000	000000000	0000000	0000000
21"	4,500 cfm @ 1/2 in. of H₂O 5,200 cfm @ 0 in. of H₂O	46 dB @ 15 ft.	900	1	38 1/4"	32 3/4"	28"	Aluminum	ETL Listed	0000000	00000000	0000000	000000
208-230/460V AC, Three Phase—Hardwire
25"	6,500 cfm @ 1/2 in. of H₂O 7,300 cfm @ 0 in. of H₂O	48 dB @ 15 ft.	775	1 1/2	42 1/2"	37 3/4"	33"	Aluminum	ETL Listed	0000000	00000000	0000000	000000

Roof Louvers

Louver

Surface Mount

Mounting Base

These louvers are gravity operated. The blades open when your roof-mounted exhaust fan goes on and close when it's off, preventing backdrafts. The felt seal on the face of the blades ensures quiet closing and better protection from the weather.

Mounting bases are sold separately. Louvers fit the bottom of the mounting base and must be secured to the lip of the base with sheet metal screws (not included).

Also Available: Additional louver sizes. Please select 8061T999 and specify louver dimensions.

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

Louvers
For Opening		Overall							8" Overall Ht. Mounting Bases			12" Overall Ht. Mounting Bases
Wd.	Ht.	Wd.	Lg.	For Max. Air Velocity, fpm	Temp. Range, °F	Mounting Fasteners Included		Each	Inside Wd.		Each	Inside Wd.		Each
Surface Mount
Galvanized Steel Frame and Aluminum Blades
13 3/4"	13 3/4"	13 3/4"	13 3/4"	2,000	-40° to 180°	No	000000	000000	14 1/2"	0000000	0000000	14 1/2"	0000000	0000000
15 3/4"	15 3/4"	15 3/4"	15 3/4"	2,000	-40° to 180°	No	000000	00000	16 1/2"	0000000	000000	16 1/2"	0000000	000000
17 3/4"	17 3/4"	17 3/4"	17 3/4"	2,000	-40° to 180°	No	000000	00000	__	000000	00	19 1/2"	0000000	000000
19 3/4"	19 3/4"	19 3/4"	19 3/4"	2,000	-40° to 180°	No	0000000	00000	21 1/2"	0000000	000000	__	000000	00
21 3/4"	21 3/4"	21 3/4"	21 3/4"	2,000	-40° to 180°	No	0000000	00000	__	000000	00	23 1/2"	0000000	000000
23 3/4"	23 3/4"	23 3/4"	23 3/4"	2,000	-40° to 180°	No	0000000	00000	__	000000	00	25 1/2"	0000000	000000
27 3/4"	27 3/4"	27 3/4"	27 3/4"	2,000	-40° to 180°	No	0000000	00000	__	000000	00	28 1/2"	0000000	000000
34 3/4"	34 3/4"	34 3/4"	34 3/4"	2,000	-40° to 180°	No	0000000	000000	35 1/2"	0000000	000000	35 1/2"	0000000	000000
36 3/4"	36 3/4"	36 3/4"	36 3/4"	2,000	-40° to 180°	No	0000000	000000	__	000000	00	37 1/2"	0000000	000000