Selecting a HVAC Grille

Advice and FAQ information to help you select the right HVAC grille.

• How to size grilles and diffusers.
• What’s the difference between fixed grilles and adjustable grilles?
• How do I properly choose a register grille for my duct hole?
• What is the difference between a register grille and diffuser?
• Why are some HVAC vents on the floor?