3. Read and translate the given part of the instruction “Installing a Bathroom Fan”, filling in the missing words.

a) a motorized exhaust fan	f) vent pipes	k) exhaust
b) manufacturer's	g) outside wall	l) joists
c) moisture	h) odors	m) flexible duct
d) steel pipe	i) run	n) exhaust
e) air flow	j) ductwork

You can install (1)___ to help remove excessive (2)___ and unpleasant (3)___ from the bathroom. Usually the fan is installed in the ceiling between two (4)___. The fan will have (5)___ connected to it and (6)___ through the roof or an (7)___. Do not make the mistake of venting the fan to the attic. You could end up with mold and mildew forming all over the place and causing a serious health risk.

Whether you put in the fan or hire someone, it is important to buy a large enough fan and to run the (8)___ the right way. You will need to determine the CFM (cubic foot per minute). This is the amount of air removed from the space per minute.

It easy to figure out the fan size, just multiply the square footage of the bathroom by 1.1. For example, a 140-square-foot bathroom would need a ventilation fan with a 154 or higher CFM.

When you (9)___ the duct work, follow the fan (10)___ specifications for the fan you are installing. If the (11)___ port on the side of the fan calls for 4-inch pipe, install only a 4-inch-diameter pipe. Although some ventilation fans may allow (12)___, rigid stainless (13)___ will give you a more durable and efficient assembly. The smooth surface of rigid piping allows for better (14)___.

Unit 4______________________________________Humidification

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1. Choose the right word.

(Humidity / Humidification) is the amount of moisture that exists in the (air / soil). It can (occur / change) depending upon the time of year and whether there is active (rain / precipitation). Relative humidity is the percentage of (moisture / water) that actually exists relative (with / to) the amount that could. Dew points reflect the temperatures where (80 / 100) percent humidity will occur.

There are (certain / several) regions that tend to have higher levels of humidity than others. In general, cities that are located (farther / closer) to the equator have (lower / higher) dew points and feel more (humid / humidity).

2. Fill in the words listed below.

a) remove	c) increase	e) key	g) precipitation
b) dew	d) Moisture	f) cool	h) thunderstorms

Air moisture is a 1)______ component of humidity. When more moisture exists, there is a greater chance of 2)_______. Storm activity tends to 3)_______ with high amounts of air moisture. For example, locations such as Florida in the United States tend to experience regular afternoon 4)________ year round.

5)_______ levels tend to be higher when the air is 6)_______. In many locations, morning temperatures often result in visible 7)_______ on plants and grass. This is because colder temperatures are not able to 8)_______ as much moisture from the air.