Your condo violates Code and is unsafe, and your HOA consists of idiots
First off -- your condo's existing setup, with a recirculating hood over a domestic gas appliance, is quite clearly a Code violation and a flagrant safety hazard, as IFGC 503.3 strictly prohibits the recirculation of gas appliance exhaust due to the unacceptable CO buildup that would otherwise occur:
503.3 Design and construction Venting systems shall be designed and constructed so as to convey all flue and vent gases to the outdoors.
Second, that ceiling exhaust in the laundry room likely was installed to service the dwelling unit -- you'd need to replace that ventilation system in order to reuse the existing exterior penetration for the range hood duct, and that leaves you back where you started.
However, if you can have an engineer analyze your ventilation situation as per Chapter 4 of the IMC and determine that the vent fan in the laundry room is indeed not necessary to provide Code-compliant ventilation to the dwelling unit as a whole, then you can disconnect the ductwork from the laundry room vent fan and reuse that penetration for the range hood, provided that the duct meets the conditions given in IMC 505.1 for domestic range hood ducts:
505.1 Domestic systems Where domestic range hoods and domestic appliances equipped with downdraft exhaust are located within dwelling units, such hoods and appliances shall discharge to the outdoors through sheet metal ducts constructed of galvanized steel, stainless steel, aluminum or copper. Such ducts shall have smooth inner walls, shall be air tight, shall be equipped with a backdraft damper, and shall be independent of all other exhaust systems.
Clarification on the question may change this, but I took a look at the Wolf "Ventilation Guide" on their site, and it does recommend their PRO hoods for the dual fuel ranges. The 36" model calls for a 900CFM hood, but for the introduction to the page it says:
Ventilation performance is measured in cubic feet per
minute, or CFM. The chart below provides CFM suggestions specific to the Wolf cooking appliance and ventilation
system used.
Now the use of the word suggestions tells me that these are not hard requirements. Another section of the manual has this to say:
The appropriate airflow capacity is determined by the
cooking space and cooking style. ... Greater exhaust capacity is required to handle the moisture
generated by boiling large pots of water or the grease and
smoke from grilling or frying. Cooking with high heat or
cooking aromatic foods may require additional CFM and
increasing the capture area...
That shows that they can't possibly give you a hard requirement because the variables are all usage related and also depend on the space the range is going to be set in.
These luxury brands also live on customer experience, so if anything they are going to pad any requirements to make sure they meet expectations. You don't want someone spending $15,000 on a stove to complain to their friends when the boiling spaghetti pot steams up the kitchen.
So, I say get the best hood that you can, but if you're not going to do much cooking, 300CFM will be fine. If you do end up hosting a party and the stove goes into overdrive, you might get more odor or moisture than you would like.
Best Answer
Exhaust duct is greasy clogged, right? - We do not know, we can not see it from here.
How can I clean it, but not access it? - You can not. You have to access the duct if you want to clean it.
Are there safe chemicals I can spray at range hood fans? - There are dozens of safe grease cutting/cleaning chemicals on the market.
Then when I turn on range hood fans, these chemicals suck into exhaust duct, destroy all grease, and everything sucked out? - NO, that is not how it works. There is no sucking mechanism in your duct.
I don't want remove range hood or open exhaust duct. - Sorry but removal of the hood is required to clean the duct ( and to even assess if it is indeed full of grease.)
Here is the USA distributors web site. Your model is the R-727II.
Here is the contact email for sakura USA - achoo@sakura-usa.com
Here is link to a search results on YouTube for cleaning range hoods.
Your unit does appear to be rather unconventional, looking at the photo it is not clear where the filters are or how to access them.
That is why you need to contact them directly.
UPDATE: Your range hood does not have "traditional" screens that trap the grease. There are two clear plastic grease collectors for each fan. one is mounted to the cone shaped fan guard and the other is at the back of the unit behind each fan near the wall. I believe the premise is condenses or collects on some unknown to me part of the unit and then drips down into the removable plastic receptacles. In theory the grease should not be getting into your duct. this video, not in English shows a brief simulation of the grease trap at work near the end of the video. Here is link to a parts page that has the plastic trays.
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