If you’ve ever stuck a musty scent when the AC kicks on or puzzled why your allergic reactions flare up indoors, your HVAC gadget, together with the air vents and ducts, may well be seeking to let you know one thing. Hidden at the back of vents and tucked away in ductwork, there’s part of your house that hardly ever will get spotted—nevertheless it performs an enormous position on your indoor air high quality.
Source hyperlink