Title: Discussion Board
Course: HET 293 - HVAC and Building Codes > Section: HET 293 - HVAC and Building Codes

HVAC Code Week Nine and Ten

In chapter 11 and 12 it covers Chimneys and Fireplaces; Mechanical and Fuel-Gas. Working with fuel operated heating equipment, chimneys is necessary; however, with older homes the chimney was designed for large BTUs inefficient systems where a great deal of heat would travel through the flue and chimney. Sizing both of these passages is critical for proper venting because of the newer efficient system with low heat load. Both health and safety must be maintained at all times.

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Read chapter 11, 12, and websites, watch the You Tube videos and make comments of the next questions.

1. Why is it necessary to size the chimney liner smaller than the existing chimney?
2. What material is the flue liner made out of? Why
3. Should a chimney be positive or negative pressure?
4. What is a down draft?
5. What causes a down draft?
6. Explain what prohibited sources of combustion air are.
7. Explain what combustion air is and why it is necessary.

http://www.youtube.com/watch?v=MOiQ6hGbzfE

http://www.ehow.com/way_5853455_proper-chimney-flue-installation.html

http://www.csia.org/HomeownerResources/ChimneySafetyInfo/AboutChimneyLiners/tabid/117/Default.aspx

http://www.youtube.com/watch?v=wxygqO5cQAQ&feature=related