Is Demand Control Ventilation required on all projects?
Demand Control Ventilation is a control system that varies the volume of exhaust (and supply) based on cooking activity. Since there are idle and peak periods for most cooking operations, the potential to save fan and HVAC energy is significant. ASHRAE 90.1 (American Society of Heating Refrigeration and Air Conditioning Engineers) establishes design standards for […]
What is the difference between pollution control units?
Pollution Control units, also referred to as Scrubbers are systems that remove a high percentage of grease, vapor and odors from the cooking process through a means of filtration. The devices fall into 2 major categories, media filter type and electrostatic precipitators (ESP). Both systems have a form of odor abatement technology associated with them. […]
How do replacement air ceiling registers affect the hood?
The placement and location of ceiling registers (diffusers) for the introduction of replacement air can have a direct impact on the proper operation of the exhaust hood. Diffusers that have been designed for commercial spaces, such as “four way diffusers” were developed to have a high induction capability. That means they discharge at a relatively […]
Why is a heat load based design important for kitchen hoods?
Establishing exhaust volumes for hoods had been an inexact science, primarily relying on U.L. values to establish exhaust rates. U.L. however clearly states that the minimum exhaust rates established during testing should not be used for design purposes since they were achieved in a laboratory environment. A greater exhaust might be required to provide proper […]