I used to have a job as a songs producer way back in the day, but and back then, I was constantly looking for new and genius ways to make audio effects, but i do recall 1 time I had this unquestionably unofficial thought. I was pondering exactly what it would sound savor to put a vocal through the heating plus cooling HVAC duct for reverb effect, Of course, I suppose it sounds strange… But, I still wanted to see if the sounds of singing or speaking through the HVAC ducts of a heating plus cooling plan would work. I figured because of the hollow area of the HVAC ducts through the HVAC duct, it may create an original sound. I decided to try this one random day with my own voice just speaking through the microphone, then, I fed the audio through the HVAC duct rather than the speakers in the building. The sound was unquestionably pretty flat sounding. Rapping through the heating in addition to air conditioning system HVAC duct was not going to be something to explore, but while I was up there in the HVAC duct removing all the unit from our test, I noticed there was built up grime in there. This unquestionably made me tell the studio owner to call his local heating plus cooling company to get the HVAC duct cleaned. I did suppose a little bit about Heating, Ventilation, and A/C systems plus how they operated. If that HVAC duct reMEd dirty, it could clog up the heating plus undefined. This could turn into a major cost to everyone involved, and especially for a recording studio! The owner of the place unquestionably took our advice. He also gave me a discounted cost in return the next time I recorded a song there.