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quote=“cbaxter”]what about hood systems and a/c? is there a formula to use based on sq/ft? my last store i could never really keep cool. i went into a dominos the other day and had goose bumps it was so cold in there. NICE
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Hi Cbaxter:
As regards hood systems and A/c.
The ventilation system and A/c that is used in a pizza shop or restaurant is critical for several reasons.
Comfort in the shop and cost of operation being primary considerations after proper extraction of the cooking vapors.
The hood should be designed so that it extracts a minimum of air from the building as money has been spent to cool or warm that air depending on the season.
Properly designed, tested and certified hoods of say 11 ft. X 6 ft. need only pull 880 CFM of air from the building. Some hoods that size of uncertified designs would extract 4000 CFM of expensive conditioned air.
As to the size of The air conditioner. That depends on several considerations. Seating is a big factor, people in an enclosed space create substantial heat. Single or multiple floor building, any windows facing south and size of the facility are all factors.
Almost any HVAC contractor can calculate the required A/C tonnage based on above but often they do not take into sufficient consideration the heat generated by the equipment. The average delivery carry out shop with no seating will need 5-ton of A/C just to break even with the heat produced by the equipment. Larger Kitchen installations will create more heat and need more A/C to offset those temperatures. A 1200 sq. ft. pizza delivery-carry out with a certified hood as described would need at least 12 ton of A/C
Many suppliers will supply hoods that extract air at higher CFM and install a make up air unit to supply the additional air into the building. This may be a somewhat less costly system to buy, but operating costs can be so high as to be prohibitive. Most make up air units are equipped to heat the in coming air in the winter but do not cool the air in the summer. The result is the make up air unit picks up extremely hot summer air off the roof and dumps it into the building. Those type make up air units are responsible for most shops that are excessively warm in the summer.
George Mills