• 23 37 13 - Diffusers, Registers, and Grilles
• 46 51 46 - Membrane Diffusers
• 46 33 73 - Liquid Chemical Diffusers
• 46 51 43 - Floating Membrane Diffusers
• 46 51 33 - Flexible Membrane Disc Diffusers
• 46 51 26 - Shear Box Diffusers
• 46 51 31 - Flexible Membrane Tube Diffusers
• 46 51 21 - Coarse Bubble Diffusers
• 46 51 36 - Ceramic Disc Fine Bubble Diffusers
• 46 51 00 - Air and Gas Diffusion Equipment
• 23 37 00 - Air Outlets and Inlets

• Prihoda North America has an UPDATED Spec for Fabric Ducts and Diffusers
  2016-02-10 Company
• Prihoda North America has a NEW Spec for Fabric Ducts and Diffusers
  2016-01-06 Company