Grilles | McMaster-Carr

	Material Material

	Opening Pattern Opening Pattern


Diamond	Square

Circle	Oval

Weave

	Mounting Location Mounting Location

	System of Measurement System of Measurement

Inch

Metric

	Overall Length Overall Length

	Overall Width Overall Width

	Overall Thickness Overall Thickness

	For Opening Width For Opening Width

	Opening Width Opening Width

	For Opening Height For Opening Height

	Frame Material Frame Material

	Panel Style Panel Style

Flattened

Raised

	Opening Length Opening Length

	Mount Style Mount Style


Surface	Recess	Flush

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	For Duct Width For Duct Width

	Color Color

	White		Clear
	Brown		Gray

	Face Plate Width Face Plate Width

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	For Fan Width For Fan Width

	Face Plate Height Face Plate Height

	Blade Adjustability Blade Adjustability

Fixed

Movable

	Shape Shape

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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1,208 Products

Diffusers, Registers, and Grilles

Return Grilles

Cover the opening where air is pulled into your HVAC system.

Drop-Ceiling Return Grilles with Filter Holder

Place these grilles in the grid of a drop ceiling.

Return Grilles with Filter Holder

Add a filter to these grilles for protection against dust and debris entering your HVAC system.

Wall/Ceiling Registers

Direct air coming out of HVAC systems. Adjust the damper to control airflow.

Floor Registers

Install onto floor ducts to direct hot and cold air from your HVAC system.

Ready-to-Connect Drop-Ceiling Diffusers

No additional fittings or collars needed.

Drop-Ceiling Diffusers

Place these diffusers in the grid of a drop ceiling to distribute air evenly throughout your space.

Ready-to-Connect Moisture-Resistant
Drop-Ceiling Diffusers

No additional fittings or collars needed.

Moisture-Resistant Drop-Ceiling Diffusers

A vapor barrier provides moisture protection as these diffusers spread hot or cold air around a room.

Ready-to-Connect Ceiling Diffusers

Diffusers come with a collar and damper already in place for simple installation.

Ceiling Diffusers

Evenly disperse airflow into a room to maintain a consistent temperature throughout the space.

Air Diverters

Guide air toward your workspace or deflect unwanted drafts with these diverters and covers.

Louvers

Fixed-Blade Wall Louvers

Always open, these are our most basic wall louvers.

Fixed-Blade Louvers for Block and Brick Walls

Mount these louvers into openings that are too small for most louvers. They are sized for use in block and brick walls.

Heavy Duty Fixed-Blade Wall Louvers

Constructed with a thick frame and blades, these louvers have a long service life.

Adjustable-Width Fixed-Blade Wall Louvers

Get an exact fit for your opening by sliding out these louvers to the width you need.

Fixed-Blade Wall Louvers with
Adjustable Register and Filter

The included filter cleans the air as it passes through these louvers.

Fixed-Blade Wall Louvers with Adjustable Register

Mount these louvers through an outside wall and control airflow from the inside by adjusting the register.

Heavy Duty Movable-Blade Wall Louvers

Thicker than standard movable-blade wall louvers, these are rugged and dependable.

Movable-Blade Wall Louvers

These gravity-operated louvers remain open only when air flows, preventing backdrafts.

Corrosion-Resistant Movable-Blade Wall Louvers

Use these louvers in harsh environments—they won't rust.

Enclosure Louvers

Relieve heat buildup and prevent condensation from forming inside enclosures and other small spaces.

Weather-Resistant Enclosure Louvers

With a gasketed sealing kit, these louvers shield your enclosure from dirt, moisture, and weather while regulating heat and stopping condensation from forming inside.

Door Louvers

Allow air to circulate through doors while maintaining privacy.

Fire-Rated Door Louvers

A spring-loaded fusible link locks the blades closed if the temperature reaches 167° F. Louvers meet UL 10C fire requirements.

Roof Louvers

These louvers are gravity operated. The blades open when your roof-mounted exhaust fan goes on and close when it's off, preventing backdrafts.

Metal Panels

Close off openings in structures while allowing air to pass through.

Fans and Blowers

Equipment-Cooling Fan Guards

Equipment-Cooling Fan Guards with Filters

Filters remove dust and other particles from the air.

Shielded Equipment-Cooling Fan Guards

Made of conductive metal, these guards cover fans to block EMI (electromagnetic interference) and RFI (radio frequency interference).

Supply-Side Guards for Wall-Mount Exhaust Fans

Exhaust-Side Guards for Wall-Mount Exhaust Fans

Fan Guards

These two-piece guards attach to NEMA frame motors.

Vents for Enclosures

EMI/RFI-Shielding Enclosure Vents

These conductive aluminum screens block electromagnetic interference (EMI) and radio frequency interference (RFI) to prevent electrical problems such as radio static and faulty signals. Made of mesh, they let air flow through, so the pressure in your enclosure stays constant as temperatures fluctuate.

Enclosure Vents

Attach these vents to the top or side of sealed enclosures, so air can flow through to equalize internal and external temperature and pressure.

Diffusers, Registers, and Grilles

Return Grilles

Drop-Ceiling Return Grilles with Filter Holder

Return Grilles with Filter Holder

Wall/Ceiling Registers

Floor Registers

Ready-to-Connect Drop-Ceiling Diffusers

Drop-Ceiling Diffusers

Ready-to-Connect Moisture-ResistantDrop-Ceiling Diffusers

Moisture-Resistant Drop-Ceiling Diffusers

Ready-to-Connect Ceiling Diffusers

Ceiling Diffusers

Air Diverters

Louvers

Fixed-Blade Wall Louvers

Fixed-Blade Louvers for Block and Brick Walls

Heavy Duty Fixed-Blade Wall Louvers

Adjustable-Width Fixed-Blade Wall Louvers

Fixed-Blade Wall Louvers withAdjustable Register and Filter

Fixed-Blade Wall Louvers with Adjustable Register

Heavy Duty Movable-Blade Wall Louvers

Movable-Blade Wall Louvers

Corrosion-Resistant Movable-Blade Wall Louvers

Enclosure Louvers

Weather-Resistant Enclosure Louvers

Door Louvers

Fire-Rated Door Louvers

Roof Louvers

Metal Panels

Metal Panels

Fans and Blowers

Equipment-Cooling Fan Guards

Equipment-Cooling Fan Guards with Filters

Shielded Equipment-Cooling Fan Guards

Supply-Side Guards for Wall-Mount Exhaust Fans

Exhaust-Side Guards for Wall-Mount Exhaust Fans

Fan Guards

Vents for Enclosures

EMI/RFI-Shielding Enclosure Vents

Enclosure Vents

Ready-to-Connect Moisture-Resistant
Drop-Ceiling Diffusers

Fixed-Blade Wall Louvers with
Adjustable Register and Filter