But if you are just acting on the hunch, we advise you start by inspecting the vents, grilles, drip pans, and/or registers of one's device. Would you see any discoloration or dim dust? Would you scent nearly anything uncommon? The U.S. Environmental Security Agency promises that indoor exposure to pollutants https://duct-cleaning44443.bloggerswise.com/35969699/the-greatest-guide-to-air-duct-cleaning