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2. Register (air and heating) - Wikipedia

   en.wikipedia.org/wiki/Register_(air_and_heating)

   A grille is a perforated cover for an air duct (used for heating, cooling, or ventilation, or a combination thereof). Grilles sometimes have louvers which allow the flow of air to be directed. A register differs from a grille in that a damper is included.

3. 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!

4. 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.

5. Turning vanes (HVAC) - Wikipedia

   en.wikipedia.org/wiki/Turning_vanes_(HVAC)

   This product article is a stub. You can help Wikipedia by expanding it.

6. AOL.com - News, Sports, Weather, Entertainment, Local & Lifestyle

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   AOL latest headlines, entertainment, sports, articles for business, health and world news.

7. Spark arrestor - Wikipedia

   en.wikipedia.org/wiki/Spark_arrestor

   Screen type spark arresters use a physical mesh to prevent large particles from leaving the exhaust system. This is the simplest and most common type of spark arrester. Screen type devices are used on most motorcycles, ATVs, and small engines.