A grille is an air terminal device with multiple passages of airflow. A register is a combination of grille and damper assembly.
Clamp meter connected to an AC monitors the current flow and indicates usage (range) through green, orange and red colour codes. The four friends had learnt about capacitor and its use in many electronic appliances in their physics class. Ageing of these, leads to lesser efficiency of the appliance. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.

Linear bar grilles are architecturally beautiful and robust in construction. They are suitable for supply and return air applications where the air volume requirements are medium and high. They are best suited for side wall mounting applications but they may be used in other applications like false ceiling , sill and floor mounting . hospital,shoping maiis,auditoriums are typical applications of these bar grilles.

Square Diffusers supply large volumes of conditioned air at reasonable pressure drop and satisfactory sound levels.
Square diffusers are popularly used when overall dimensions are limited or some times architectural design considerations and by the choice of the client. 
Square diffusers have pleasing appearance and synchronize with the ceiling.
In square diffusers, the uniform horizontal jet from outer core guides effective air distribution for wide range of air volumes.
A range of square ceiling diffusers designed to produce 4 way directional air pattern.

Clamp meter connected to an AC monitors the current flow and indicates usage (range) through green, orange and red colour codes. The four friends had learnt about capacitor and its use in many electronic appliances in their physics class. Ageing of these, leads to lesser efficiency of the appliance. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.