HVAC Ceiling Diffusers & Return Grilles
Shop ceiling diffusers, return grilles and eggcrate grilles for T-grid (drop) ceilings and surface-mount installations, in plastic, aluminum and fire-rated plastic. Not sure which one you need? See how to choose below, or send us a photo and we’ll help.
- Fits standard 2x2 and 2x4 T-grid ceilings
- Plastic, aluminum & fire-rated options
Answer three questions and you’ll know what to order.
- Supply or return? A supply diffuser blows conditioned air into the room and connects to a duct. A return grille lets air flow back to the system. Eggcrate and filter grilles are return grilles.
- How is it mounted? T-grid (lay-in) grilles drop into a suspended ceiling grid like a ceiling tile. Surface-mount grilles screw onto drywall or a hard ceiling over the opening.
- What size? For T-grid, match the grid: 2×2 or 2×4 (egg crates). For a supply diffuser, also measure the round duct it connects to (the neck size, e.g. 6″, 8″ or 10″). For surface-mount, measure the duct opening in the ceiling or wall, not the old grille’s outside edge.
Material: plastic doesn’t rust and is light and easy to handle; aluminum is stiffer and more traditional. If your building requires fire-rated materials in the ceiling, choose a fire-rated option and confirm its rating on the product data sheet with your inspector or engineer.
Still not sure? Text us a photo of the grille and the ceiling, or call 508-788-1200.
Types of HVAC Grilles & Diffusers
Pick the type first, then the size and material.
T-grid supply diffusers
Drop into a 2x2 or 2x4 ceiling grid and spread supply air into the room. Match the duct neck size.
T-grid return grilles
Lay-in grilles that let air return to the system through the ceiling.
Eggcrate return grilles
An open cube grid for returns. The same core is also used as a lighting louver.
Filter return grilles
Return grilles that hold an air filter behind the face.
Surface-mount grilles
Screw onto drywall or hard ceilings and walls over the duct opening.
Fire-rated plastic
For buildings that require fire-rated ceiling materials. Check the rating on the data sheet.
Shop HVAC Ceiling Diffusers & Return Grilles
Showing all 5 resultsSorted by latest
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2 x 2 American Louver Stratus Plaque Style Plastic Ceiling Diffuser | Color: Black
$ 86.99 Select options -
2 x 2 American Louver Stratus Plaque Style Plastic Ceiling Diffuser | Color: White
$ 86.99 Select options -
American Louver Stratus Cone Style Plastic Ceiling Air Diffuser | Color: Tan
$ 86.99 Select options -
American Louver Stratus Cone Style Plastic Ceiling Air Diffuser | Color: Black
$ 86.99 Select options -
American Louver Stratus Cone Style Plastic Ceiling Air Diffuser | Color: White
$ 86.99 Select options
HVAC Grille & Diffuser FAQ
Questions before you order? Here are the most common ones.
Text us a photo
Send a picture of the grille and the ceiling to 617-867-5078.
Tax-exempt & POs
Schools, agencies and businesses can order by PO or tax-exempt.
Bulk orders
Outfitting a whole floor or building? Ask for a quote.
A supply diffuser connects to a duct and spreads conditioned air into the room. A return grille covers the opening where air flows back to the heating or cooling system. Eggcrate and filter grilles are return grilles.
Lay-in (T-grid) grilles are made to replace a ceiling tile, so match your grid: 2×2 or 2×4. For a supply diffuser, also match the round duct neck size, such as 6″, 8″ or 10″.
Plastic doesn’t rust, is light and is easy to handle. Aluminum is stiffer and is the traditional choice. Both come in standard T-grid sizes. If your building requires fire-rated ceiling materials, choose a fire-rated option.
It depends on your building and local code. If your inspector, engineer or facility requires fire-rated materials in the ceiling, choose a fire-rated product and check its rating on the data sheet before installing.
Yes. Email your exemption certificate or purchase order to csr@fluorolite.com, or see our tax-exempt and government orders page.