Filter Curb


Final Filter Curb Markets

  • Healthcare
  • Green Buildings (LEED)
  • K-12 Education/Higher Education
  • Airports
  • Government/Commercial Building
  • Manufacturing Facilities

Standard Features

  1. Single access door
  2. 1”, 2” or 4” Slide-in racks
  3. 1” Racks can be used with cartridge (6” or 12”), bag or carbon filters

Pre-Fabricated Final Filters roof curbs are available in the following:

  • Insulated curb
  • Non-insulated curb
  • Vibration isolated curb


Final Filter curbs can be provided with the following filters

  • Pleated Filters
  • Cartridge Filters (60-95% Efficient)
  • Bag Filters
  • Carbon Filters
  • HEPA Filters

Final Filter Options

  • Doors on both sides of filter curb
  • Diffuser
  • Return air filtration
  • Magnahelic or filter gauge
  • Curb extension (for factory curbs)


  • Pre-Fabricated Final Filter Curb to be manufactured of prime G-90 galvanized steel construction, 18 or 14 gauge as required, meeting ASTM A-653/653M, with welded corners and with seams joined by continuous water and air tight welds.
  • All areas in contact with supply air shall have double wall solid construction with a 20 gage galvanized steel liner.
  • Hinged side filter access door with heavy-duty hasp or locking system.
  • Intermediate wood nailer strip with galvanized steel flashing located below filter access door.
  • Insulated with 1 ½” thick 3 lbs. density rigid fiberglass insulation.
  • Filter racks shall be constructed of heavy gauge, G90 galvanized steel and accommodate standard size pleated, cartridge, bag, carbon or HEPA style filters with 1” perimeter header frame. *Maximum filter depth for standard final filter curb is 12”.
  • Final Filter area of roof curb shall be an air-tight plenum with bottom opening to match factory duct opening size.