Question : Cost of retrofitting a building with a commercial kitchen exhaust hood system?
We are beginning construction on a restaurant, and the HVAC exhaust hood quote seems high. As in, more than I made last year high. I would like an educated guess from others out there about how much this should cost us. Here are our mechanical specs for the system per our architect and engineer:

Hood must be 115″ long x 51″ wide x 24″ high UL listed type 1 exhaust hood with rear supply, incandesent lights, fire suppression, and controlls for lights and fan.

A makeup duct must be routed from the first floor restaurant through a second floor space and to a rooftop fan. The exaust duct will also go through the roof to a separate rooftop fan. The exhaust duct is described in our plans as being 16/14 welded steel grease exhaust duct wrapped with flameshield insulation. We don’t have an accurate length of ductwork, but it is at least 40 feet per duct (both floors have very high ceilings).

A mechanical gas shut-off valve must be interlocked with hood suppression system.
commercial kitchen floor plan

Best answer:

Answer by mechclimcorp
i do a lot of kitchen work exhaust refer. a/c etc. Kitchen exhaust is very expensive.all the ductwork needs to be welded water tight stainless steel. which can run upwards of 400 a linear foot installed. the hood itself can cost about 5000 plus install. equipment make up and exhaust can run about 5$ /cfm and the halon fire suppression must be done by a certified fire company and is also pretty expensive. there must also be access doors to the ductwork for grease cleaning which can cost more on const. in other areas.insulation is about another 20$ /lin.ft.