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2. List of building materials - Wikipedia

   en.wikipedia.org/wiki/List_of_building_materials

   This is a list of building materials.. Many types of building materials are used in the construction industry to create buildings and structures.These categories of materials and products are used by architects and construction project managers to specify the materials and methods used for building projects.

3. Duct (flow) - Wikipedia

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

   Round duct is made using a continuous spiral forming machine which can make round duct in nearly any diameter when using the right forming die and to any length to suit, but the most common stock sizes range evenly from 4" to 24" (10-60 cm) with 6"-12" (15-30 cm) being most commonly used. Stock pipe is usually sold in 10' (300 cm) joints.

4. R.I. Bong Air Force Base - Wikipedia

   en.wikipedia.org/wiki/R.I._Bong_Air_Force_Base

   The U.S Army Corps of Engineers made an effort to sell 16,372 feet of 3" electrical fibre duct and fittings, 34,0000 pounds of number 4, 5, 6 and 8 reinforcing bars, miscellaneous fabricated cages, forms, metal grates and manhole covers, 1,420 ft of 8 inch diameter Helcor pipe, miscellaneous concrete paving supplies, miscellaneous airport ...

5. Rivet - Wikipedia

   en.wikipedia.org/wiki/Rivet

   The most common machine is the impact riveter and the most common use of semi-tubular rivets is in lighting, brakes, ladders, binders, HVAC duct-work, mechanical products, and electronics. They are offered from 1/16-inch (1.6 mm) to 3/8-inch (9.5 mm) in diameter (other sizes are considered highly special) and can be up to 8 inches (203 mm) long.

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. Heating, ventilation, and air conditioning - Wikipedia

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

   Warm air systems distribute the heated air through ductwork systems of supply and return air through metal or fiberglass ducts. Many systems use the same ducts to distribute air cooled by an evaporator coil for air conditioning. The air supply is normally filtered through air filters [dubious – discuss] to remove dust and pollen particles. [15]