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2. Cable jetting - Wikipedia

   en.wikipedia.org/wiki/Cable_Jetting

   Another capability is to install a single cable or a bundle of small ducts into an occupied duct. The most expensive activity in installing a network is the need for civil works. Thus, re-using ducts occupied with one cable, leaving some space, is a tempting and often possible and cost-effective alternative.

3. Duct leakage testing - Wikipedia

   en.wikipedia.org/wiki/Duct_leakage_testing

   A duct leakage tester is a diagnostic tool designed to measure the airtightness of forced air heating, ventilating and air-conditioning (HVAC) ductwork. A duct leakage tester consists of a calibrated fan for measuring an air flow rate and a pressure sensing device to measure the pressure created by the fan flow.

4. List of construction trades - Wikipedia

   en.wikipedia.org/wiki/List_of_construction_trades

   Roofers replace, repair, and install the roofs of buildings. Sheet metal worker, also known as a Mechanical Worker, A person who installs Heating Ventilation and Air Conditioning systems (HVAC), duct work, and exhaust systems for kitchens, bathrooms, laundry rooms, furnaces, etc. They also install gas lines and gas piping to a variety of ...

5. Sound attenuator - Wikipedia

   en.wikipedia.org/wiki/Sound_attenuator

   A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.

6. 15 Things That Will Always Fail a Home Inspection (and ... - AOL

   www.aol.com/15-things-always-fail-home-160000027...

   Depending on its condition, or if your roof is over 20 years old, your inspector might suggest you budget for a new roof, which can cost $25,000 on average to replace.

7. Dust collector - Wikipedia

   en.wikipedia.org/wiki/Dust_collector

   However, they are seldom used as primary dust collectors because of their large space requirements and low efficiency. A practical use is as precleaners for more efficient collect. Advantages: 1) simple construction and low cost 2) maintenance free 3) collects particles without need of water. Disadvantages: 1) low efficiency 2) large space ...