7. WHAT IS THE DIFFERENCE BETWEEN VENTS, AIR DIFFUSERS, GRILLES, LOUVERS, REGISTERS

 
 

ΚΩΔ. 10.7.1 ΑΕ

ΑΕ/AP

What do the terms register, grille, and diffuser mean?

These terms are used in the industry loosely.  Here is our interpretation of the terms:

  • Register is a supply vent that has a damper.
  • Grille is a return or a supply that does not have a damper.
  • Diffuser is a supply that is in the ceiling.  (An air diffuser is a circular, square, or rectangular air distribution outlet, generally located in the ceiling and comprised of deflecting members discharging supply air in various directions and planes, and arranged to promote mixing of primary air with secondary room air.)

What is a supply?

A vent in which the air is coming out of the wall, ceiling, or floor.

What is a return?

An intake vent in which the air goes back to the air handler.

What is a damper?

A device on a vent or in ductwork that regulates the airflow.  It can be either a handle on the face of the grille or a gear that is operated with a screwdriver or key.

What is the difference between wall and floor registers?

Floor registers can support the weight of a person while a wall register cannot.  The damper operator on a floor register is almost flush with the floor while a wall register's handle stands out from the face of the grille.

What is a louver?

A louver vent is a kind of physical installation that helps vent air through a fixture that incorporates slanted pieces for natural control in heating and cooling systems.  Lots of buildings have a louver vent system in place to help route warm or cool air into rooms.  This kind of engineering is also popular in vehicles and other heating and cooling systems for any kinds of interior spaces.

The term "louver vent" comes from the French "l'ouvert" meaning "open".  Original louver vent systems were made from wooden slats to let in air and sunlight while keeping out precipitation.  These were very simple additions to exterior walls.  As technology improved, it became more common for louver designs to include an ability to shift their angle, in order to provide more versatility for these kinds of air control systems.

How can I find the grille I want?

You need to know three things:

  1. The opening size.
  2. Is it a supply or a return?
  3. Is it in the wall, ceiling, or floor?

How to order the correct vent:

To ensure proper fit be sure to order your vent in the same size of the opening or duct it will fit into or cover.  We do not use overall dimensions of the existing vent in the listed sizes of our product.  If you are ordering a wall return or filter grille be sure to order with the horizontal opening sized listed first followed by the height (width x height).

How do you determine what size to order?

Grilles, registers, and diffusers are listed by the opening size.  To calculate the size you need, measure the opening or ductwork.  The width and height of your opening will match the listed dimensions of the grilles.  Grilles are listed with the width dimension first and the height second.  Each item listed will also show the outside dimensions if this is critical to your situation.

 
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