A residential heating and air conditioning system is only as efficient as its air delivery component. The quantity and velocity of air movement within space and the proper mixing of supply air with space affect comfort levels.
Supply air should be directed to the sources of greatest heat loss or heat gain to offset their effects. Registers and grilles for the supply and return systems should accommodate all aspects of the supply distribution patterns such as throw, spread and drop; also, the outlet and return grille velocities must be held within reasonable limits. Any noise generated at the grille is of equal or greater importance than duct noise. The diagrams show recommended grille and register locations.