Copyright Goodheart-Willcox Co., Inc. 115
Name __________________________________________Date _________________Class ______________________________
________2. The portion of the air distribution system shown contains which of the
following?
A. Straight duct sections and an offset
B. Straight duct sections and a transition
C. Straight duct sections, an offset, and a transition
D. Offsets and one transition
________3. Consider a tee fi tting that has three duct sections connected to it. A 300-cfm
airstream is entering the tee from one duct, while a 200-cfm airstream is
leaving the tee through another duct. What is the airfl ow and its direction in
the third duct connected to the tee fi tting?
A. An airstream of 500 cfm is fl owing out of the tee.
B. An airstream of 500 cfm is fl owing into the tee.
C. An airstream of 100 cfm is fl owing into the tee.
D. An airstream of 100 cfm is fl owing out of the tee.
Critical Thinking
1. Why is it important for all of the tee “infl ows” to equal all of the tee “outfl ows”?
2. Why do offset fi ttings have the same inlet and outlet cross-sectional measurements?
3. With respect to system and space pressures, what function does a transfer grille perform?