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1) Stale air is diluted or removed by ventilation which supplies fresh air to your home.
2) Using common sources of moisture, odors, and gases means improving indoor air quality.
3) General ventilation is used for localized pollution sources.
4) In spot ventilation the exhaust fan is usually turned off when the source is producing pollutants.
5) General ventilation fans operate constantly to control pollutants.
6) Exhaust fans draw fresh air in through cracks, windows, or fresh air intakes while pulling stale air out of your house.
7) Exhaust-only ventilation is more simple than supply-and-exhaust.
8) Exhaust-only ventilation means energy-recovery ventilation.
9) Air always moves from lower to higher pressure areas.
10) Your home's location, the type of system used, and how your home was built influence operating costs.
Complete the following sentences according to the text.
1) Good ventilation is important because …
2) … are signs of poor ventilation.
3) Spot ventilation uses exhaust fans in order to …
4) General ventilation is used constantly because...
5) General ventilation can be provided in two ways: …
6) Exhaust-only ventilation is a good choice for homes that …
7) With supply-and-exhaust ventilation, exhaust fans pull stale air out of the house while …
8) Supply-and-exhaust ventilation is a good choice for homes with …
9) Understanding how air moves inside your home can help you …
10) The cost of ventilation system depends on …
Answer the following questions and give examples.
1) What is ventilation?
2) What are the examples of home ventilation?
3) What is fresh air provided by in general ventilation?
4) What do the fans in general ventilation do?
5) What is pressurizing and depressurizing?
6) What are the advantages of supply-and-exhaust ventilation?
7) What are air pressure differences caused by? Give examples.
8) When is your home under positive pressure / negative pressure / neutral pressure?
9) Can good ventilation be achieved at a reasonable cost?
10) How can operating costs be minimized?
11) Ventilation systems in time can pay for themselves in energy savings, can’t they?
Fill in the table using the information from Text 1.
| Types | Peculiarities | Usage | |
| spot ventilation | ----------------- | ||
| general ventilation | exhaust-only | ||
| supply-and-exhaust |
10. What do you think?
v What is the main purpose of the text?
v Why is ventilation important?
v How are houses ventilated?
v What can you do to improve ventilation?
Write a summary of Text 1.
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