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Question DetailsAsked on 7/24/2017

Cost to install commercial vent hood? 2-12' Single story restaurant

Single story plaza. I need two 12' vents installed. One estimate I got total for new hood with fire supp etc, installation etc was $25000. It seems I can buy brand new myself for around 14k so that means installation is 13k which seems ridiculously high.

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You are probably not going to like this, but there is a fairly accurate rule-of-thumb that restaurant vent hoods run about $1000/LF of hood, plus about $100-200/LF for exhaust duct to the roof or outside - so sounds like you are right in that range with that bid.

Also, 50% labor for HVAC work is not at all unusual - commonly even higher but exhaust hoods are pricey and the fire suppression, system is relatively high equipment cost, so 50% would sound about right to me, off hand.

Cost of course varies by regional cost factors. Can also run a couple to few hundred $/LF less for odor/moisture control-only type hoods, and can easily run a few hundred to $500/LF more for the much more expensive positive flame control hoods with automatic fire supression system triggering and/or self cleaning units which are required in some cases over deep friers and grills and such. Though those specialty units are commonly not required in 1-2 story buildings in many areas - normally they are required in multi-story resorts and hotels and hospitals/schools and such where a grease fire in the ducting can be a major life safety issue.

Ducting penetrating through concrete floors or into ventilation isolation zones (requiring automatic positive cutoff fire dampers and/or positive fire isolation) and such can also up the cost significantly.

BTW - one hint - do NOT allow them to run the exhaust duct through the roof and flash it direct to the roof even if allowed in your area. Firstly, if the ducting needs to be replaced in the future, that will also mean redoing the roofing flashing/waterproofing - which generally means a "patch" type job, not correct flashing/waterseal integration into the roofing system. Second, that is a quick way to get a roof fire in the event of a flash event in the ducting because the ducting is directly in contact with the presumably combustible roofing material, and thirdly the heating and cooling of the ducting will also cause leakage around the penetration in no time. Best to put in a separate penetration collar and/or curbing (aka penetration pocket) with proper fire rating clearance from the hood ducting and expertly done waterproofing with the roofing, then the hood flue passing through it (with proper standoff from it all around) has flashing installed on it as a hood or skirt which overlies the top of the roof penetration collar to allow for hood ducting movement up and down. Here is an image of what that is - though for a vent pipe not a hood duct, so does not have the fireproof features and uses combustible sealants - but shows the essential elements of what I am talking - probably about $250-400 extra per normal size restaurant hood duct penetration -

Of course, you can always get another bid, unless your GC has this included in his scope of work, though even then you can ask HIM to get another subcontractor bid if you think this is too high and you are not already under a fixed-price contract.

Answered 3 years ago by LCD

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