Plenumrisers

A plenumriser is a component used in certain HVAC (heating, ventilation, and air conditioning) systems. It specifically refers to a vertical duct or shaft that extends from a central plenum, which is a large box or chamber that distributes air, upwards through a building. The purpose of a plenumriser is to deliver conditioned air from the main air handling unit to various floors or zones of a building in a vertical configuration.

These risers are typically constructed from sheet metal or other suitable materials and are designed to be fire-rated for safety. They are an integral part of the air distribution network, connecting the main supply or return air plenum to smaller branch ducts that lead to individual rooms or spaces. The design and size of a plenumriser are determined by the airflow requirements of the building and the overall HVAC system design.

In some older or specialized systems, the plenum itself might extend vertically, and the term "plenumriser" could describe this entire vertical air distribution shaft. Modern HVAC designs often utilize more compartmentalized ductwork, but the principle of a vertical air distribution pathway remains relevant. Proper sealing and insulation of plenumrisers are crucial for energy efficiency and to prevent air leakage. They play a vital role in ensuring consistent temperature and air quality throughout a building.