| 摘要 |
A flexible inspection and access view port window that conforms to the shape of air ducts present in forced air heating, cooling and ventilation systems and hel d in place using a border layer which is magnetic or peelable adhesive, so that it can easily be installed, removed and re-installed without tools. This device allows the us er to visually inspect the air ducts by sighting the clarity of a graphic viewing target with border attached within the duct. The graphic will be obscured with an accumulation of dust or other contaminants. Air pressure integrity inside the air duct syste m is maintained without the use of sealing gaskets or screws. The viewer can assi st inspection with the aid of an optional light by activating a switch at the time of inspection. An optional dust alarm can also be installed that will trigger a n audible or visual alarm when the accumulated dust level inside the duct exceeds a prese t threshold.
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