If a return air vent is located directly on the ceiling, it poses the valid question of what direction the grates should face. Related: 10 Winter Hacks for a Warmer House Without Cranking Up the Heat ...

Company: Invi Air Product: G100 – Custom Return Grille Description: For a clean, seamless look to accommodate high airflow requirements, Invi Air offers frameless mud-in grilles.Fully customized, Invi ...

Ceiling diffusers near a return grille that discharge along a ceiling surface have the potential to use the Coanda Effect in a negative manner while in heating mode. If the heated air from the ceiling ...