Dedicated outdoor air systems (DOAS) have been available for over 20 years, with the primary benefit being the ability to decouple outdoor air tempering from conditioned space thermal loads that can be handled by separate, secondary systems.
Cooking over a wood flame is hardly a novel concept, but as a popular trend in restaurants, it causes headaches and occasionally much worse from a life safety perspective. Survey a range of incidents and get reminded why creosote is a key enemy in this environment. Then finish with a look at what manufacturers, designers, and owners are (or should be) doing to win a new duel with an old fuel.
The codes and standards aren’t what they used to be when it comes to ventilation requirements. It might also be time to reconsider real-life occupancies with regard to design demands. Is there room to tighten up and boost efficiencies while maintaining adequate airflows?
For many years, duct products have often involved significant on-site measurement and construction, bringing certain advantages and risks. Here, that practice is com-pared to the use of listed ductwork, with an eye on duct integrity, hood connections, clearance to combustibles,
fire ratings, and more.