CHICAGO - It seemed that everywhere you looked at the 2006 International Air-Conditioning, Heating, Refrigerating Exposition (AHR Expo), there were new duct, grille, register, and diffuser offerings.

When confronted with the task of choosing terminal outlets (grilles and diffusers) for a supply duct system, the designer has many types from which to choose. Whether the duct system will be exposed ...

Question:We have seven-inch round ducts in the ceiling of our house, for heating and air conditioning. In a little-used room, we’ve never bothered to find ceiling diffusers for them. Now that we’d ...