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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.

Item # 4877 Eight  filtered slots direct air across the ceiling.

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  • Item # 4877 Eight  filtered slots direct air across the ceiling.
  • Install the White "U" channel support system to the ceiling grid and the flange of the filter system.
  • Made to cover and filter air from a 2'x2' diffuser.
  • Install the remaining 3 "U" channel supports on the grid system.
  • Attach white side of filter to Velcro.
  • 3 ply filter captures course and fine dust. 4 pack replacement filters, item # 4877-Filter
  • Filter specifications sheet
  • Cross Reference Chart G4 = Merv 6-7
  • Item # 4877-9/16 grid. Cut slightly smaller with thinner "U" channels for support. Special Order. Call 1-800-234-5464

Filtered Air System

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Product Name Price Qty
Filtered Air System for 1" grid system (4877n-1" grid) $79.99
Buy 5 for $76.99 each
Buy 10 for $74.99 each
4 Pack of Replacement Filters for Filtered Air System (4877-4RF) Price $6.99
Special Price $5.79

Availability: In stock.


Quick Overview

Price includes Filtered Air System face piece, 8 filters (1 extra set) and "U" channel attachment strips For decades employees have complained about cold air blowing on them from overhead air diffusers. The Filtered Air System will eliminate the draft while filtering the air, improving indoor air quality.


● Four-way airflow. Reduces cold and hot spots while creating a more uniform ambient temperature throughout the room. ● Hangs only 2.75" from the ceiling; discreet enough for use in an office, restaurant, hotel or retail setting. ● Filters trap ductwork pollution particle improving air quality which helps to reduce allergic reaction and illness. ● Helps prevent dust buildup on acoustical ceiling tiles, maintaining a cleaner appearance. Installs with ease on any 24" x 24" drop ceiling with a T-Bar grid system. ● 2 sets of filters are included with each system. Filters last about 6 months and replacements are sold separately. ● Installs on most 24" x 24" drop ceiling with a T-Bar grid system. NO tools required. All parts included. ● Outside dimensions: 25" x 25" x 2.75" ● We also have filtered air systems for 9/16". Please call to order: 1800-234-5464

Additional Information

Item # 4877-1" grid, 4877-RF

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