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2. Duct (flow) - Wikipedia

   en.wikipedia.org/wiki/Duct_(flow)

   Inspections are typically visual, looking for water damage or biological growth. [5] [6] [7] When visual inspection needs to be validated numerically, a vacuum test (VT) or deposit thickness test (DTT) can be performed. A duct with less than 0.75 mg/100m 2 is considered to be clean, per the NADCA standard. [7]

3. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Rooftop HVAC unit with view of fresh-air intake vent Ventilation duct with outlet diffuser vent. These are installed throughout a building to move air in or out of rooms. In the middle is a damper to open and close the vent to allow more or less air to enter the space. The control circuit in a household HVAC installation.

4. The Sealegend Dryer Vent Cleaner Kit is on sale at Amazon - AOL

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   Save money and energy with this dryer vent-cleaning kit loved by over 14,000 shoppers.

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6. Fume hood - Wikipedia

   en.wikipedia.org/wiki/Fume_hood

   Daily fume hood inspections entail visual inspections of the fume hood for improper storage of material and other visible blockages. Airflow is often monitored for these daily inspections by taping a piece of tissue paper to the open face of the hood such that it will be drawn inward; if the tissue is not pulled inward, the hood exhaust is not ...

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