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. at higher makeup airflow rates). Temperature of the locally supplied makeup air also was . of makeup air affecting hood performance increases as the . | By Richard T. Swierczyna, Associate Member ASHRAE, & Paul A. Sobiski, Associate Member ASHRAE large portion of kitchen ventilation planning is dedicated to project focused on how the introduction Aproperly exhausting cooking effluent. Appliance layout and of makeup air affects the capture and containment (C&C) performance of com- energy input are evaluated, hoods are located and specified, ductwork mercial food service ventilation equip- size and routing are determined, and exhaust fans are specified to re- ment. The investigation included move the proper volume of air. Unfortunately, much less time is usu- combinations of hoods, appliances, cooking conditions, MUA strategies and ally dedicated to planning how the exhausted volume of air will be other factors. replaced, although an air balance schedule is commonly used to indi- Three hood types were tested: wall- cate the source of the makeup air (MUA). mounted canopy, island-mounted canopy, and proximity (backshelf). Overlooking MUA delivery system de- Overall commercial kitchen ventila- Charbroilers and griddles, representing tails can have a negative impact on the tion issues include indoor air quality, fire heavy-duty and medium-duty appliances performance of an otherwise well-de- prevention, safety, employee comfort and respectively, were tested during idle and signed kitchen. Cross drafts and high air equipment first costs, energy operating representative cooking conditions. velocities due to improper introduction costs and maintenance costs. This article The six MUA strategies included: dis- of MUA can result in failure of the hood presents strategies that can minimize the placement ventilation (base case), ceiling to capture and contain effluent from the impact that makeup air introduction has diffuser, front face diffuser, air curtain dif- appliances. This effluent spillage may in- on hood performance. fuser, backwall supply, and short-circuit clude convective heat, products of com- To address these MUA .
