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Plastic Diffusers

Non-corrosive plastic ceiling registers, vents and air returns are ideal for wet and humid areas such as kitchens, locker rooms, showers, indoor pools, dishwashing areas and medical MRI rooms. Larger 2'x2' are made to be installed into a ceiling grid system while our smaller 12" x 12" plastic vents are ideal for rest rooms and showers.

Ceiling Repairs

Black soot and dust on your ceiling tiles can be expensive and difficult to clean or replace. Avoid damage to the ceiling tiles surrounding your ceiling diffusers by installing our unique ceiling dust deflectors. carries many innovative repair products and even offers How-To videos for the do-it-yourselfers.

Air Diverters

Block and redirect annoying drafts from square 2'x2' ceiling diffusers and linear ceiling vents. Our diverters install quickly without the need for tools. Stay comfortable while sitting at your work station. Ideal for offices, restaurants, commercial kitchens and medical facilities.

Linear Air Diverter-White. For 48" Linear Air Diffusers. Actual length is 47-3/4"

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  • Linear Air Diverter-White. For 48" Linear Air Diffusers
  • 48" Linear Diverter with a 90 degree air deflection. Actual length is 47-3/4"
  • Install the perimeter flange between the ceiling support grid and the diffuser
  • Sizes to fit 1, 2, 3, & 4 Slot Linear Diffusers
  • Stock widths available 3.75", 5.5" & 6.75". Custom widths up to 10" For custom widths, email us at, please include pictures of your existing diffuser.
  • We stock linear diverters for 2, 3, & 4 slot diffusers. Custom widths available for 5 & 6 slot diffusers.
  • Most linear diffusers are 24",48" or 60" but there are custom sized diffusers. Please measure from inside grid to inside grid.
  • Flange width is approx. 1/2".
  • Linear Air Diverter-White. For 48" Linear Air Diffusers. Actual length is 47-3/4"

4' Long White Linear Air Diverter (4875-48-xx) for 1 slot, 2 slot, 3 slot or 4 slot linear diffusers/vents

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Product Name Price Qty
White Linear Diverter 48" x 2" for 48" 1 Slot Diffuser (#4875-48x2) $31.49
Buy 10 for $29.49 each
White Linear Diverter 48" x 3.75" for 48" 2 Slot Diffuser (#4875-48x3.75) $33.49
Buy 10 for $31.99 each
White Linear Diverter 48" x 5.5" for 48" 3 Slot Diffuser (#4875-48x5.5) $33.49
Buy 10 for $31.99 each
White Linear Diverter 48" x 6.75" for 48" 4 Slot Diffuser (#4875-48x6.75) $35.49
Buy 10 for $33.99 each

Availability: In stock.



Linear Diffusers

Most standard strip air vents are designed to push air directly down, but this can make working beneath such a vent uncomfortable. Linear diverters & linear diffusers are designed to divert the air flow from strip air vents, thus making the space much more comfortable. These air diverters effectively divert hard-blowing hot or cold air outward along the ceiling so it is more evenly dispersed through the room. More importantly, they do so without compromising the air flow quality of the HVAC system.

At, we carry linear air diffusers in Stock Widths, including: 2" (for 1-slot diffusers), 3.75" (for 2-slot diffusers), 5.5" (for 3-slot diffusers), and 6.75" (for 4-slot diffusers). We also have custom widths available up to 10". All of our linear diffusers are made from 0.080 gauge high-impact white polystyrene. Item 4874 is similar to the standard linear air diffusers, but it is designed to divert air in a 45-degree pattern.

Additional Information

Item # 4875-48-xx

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