exhaust duct cleaning
https://echo-wiki.win/index.php/Why_UL_300_Compliance_Matters_for_Your_Commercial_Kitchen_Exhaust_System
Every so often, you'll notice the exhaust duct in the kitchen isn't pulling smoke like it used to, or the bathroom vent starts sounding raspy. That's when a thorough cleaning is overdue—sticky grease and grime build up inside, cutting airflow and inviting odors back in. I tackled ours last weekend, and it was a messy job but worth it: the duct now runs quieter and the kitchen stays fresher when I cook.