Grilles the function of a grille is to pull air from a room to return it to the heating or cooling system.
													
																	Ceiling return air grille installation. 
									
	
		
	
																	Warm air rises and the return will direct that air to the cooler. 
																	A return air grille is a vital component of a reverse cycle air conditioning system. 
																	25 75 w x 25 75 h 147 99 147. 
																	It differs from a register because it does not have a damper to control airflow. 
															
													
									
	
		
	
																	30 w x 6 h steel return air grilles sidewall and ceiling hvac duct cover white outer dimensions. 
																	24 x 24 adjustable air supply diffuser hvac vent cover sidewall or ceiling grille register high airflow white outer dimensions. 
																	31 75 w x 7 75 h 4 2 out of 5 stars 237 23 99 23. 
																	Homes will either have multiple small grilles throughout or a single large grille installed in either ceilings or walls.