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In heating, cooling, ventilation, or a combination thereof, a grille is a perforated cover for an air duct. Grilles sometimes have louvers which allow the flow of air to be directed. A register differs from a grille in that a damper is included. [3] [4] However, in practice, the terms "grille", "register", and "return" are often used ...
The energy assessment of UFAD systems has not been extensive, but some studies indicates potential energy savings due the lower pressure drop and lower air flow rate. Typical plenum pressures are 25 pascals (0.0036 psi ) (0.1 inch of water column) or less. [ 8 ]
Grilles sometimes have louvers which allow the flow of air to be directed. A register differs from a grille in that a damper is included. [1] [2] However, in practice, the terms grille, register, and return are often used interchangeably, and care must be taken to determine the meaning of the term used. [2] [3]
A basic duct leakage testing system includes three components: a calibrated fan, a register sealing system, and a device to measure fan flow and building pressure. Supply registers or return air grills are sealed using adhesive tapes, cardboard, or non-adhesive reusable seals.
When beginning the balance of a system, you must locate the terminal with the least amount of flow in regards to the engineer's drawing. Once the "low" terminal has been located, you can then proceed to adjust all other diffusers/grilles (air) or circuit balancing valves (water) to proportionally match the original "low" terminal.
A plenum space is a part of a building that can facilitate air circulation for heating and air conditioning systems, by providing pathways for either heated/conditioned or return airflows, usually at greater than atmospheric pressure.
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