My sibling’s home constantly aromas like grease

My sibling’s home somehow constantly aromas like leftover grease & I know it’s because she’s constantly cooking things like chicken wings & greasy hamburgers, however first of all, those aren’t the healthiest things for her to be cooking for herself & for her family, and but I’m not trying to tell her what to cook all the time.

I would just like for her to address the fact that the indoor air pollen levels in her home is just terrible.

I know that she prefers her health & the health of her family, so it’s odd that she hasn’t already addressed the indoor air pollen levels situation already! Maybe it’s just one of those things where since she lives there all the time, she has just gone nose blind to the aroma that’s permeating the HVAC ducts in her house. I don’t know, & I don’t entirely want to be mean to her or anything, however it sure is annoying. I don’t even like going over there to visit or hang out much at all because of it. I told her that maybe she should talk to one of the local Heating, Ventilation & A/C companies about the situation. I know that there are unusual ways to deal with things like this… She could get her air vents & HVAC duct professionally cleaned, for one thing; There are also these things called whole home UV air purifiers that you can install to run in tandem with your existing heating & cooling system. I assume that’s absolutely what my sibling should do, however I don’t want to come off as being all pushy & bossy. She constantly accuses myself and others of that anyway, since I’m her older sibling!

Dial thermostat