What friction rate should be used to size a duct for a design friction rate of 0.12 in WC if the duct has a total equivalent length of 150 ft?
A) 0.12 (150/100 ) = 0.12 1.5 = 0.18 in WC B) 0.12 (100/150 ) = 0.67 0.12 = 0.08 in WC
C) 0.1 in wc because that is the standard factor D) 0.12 in WC because the duct length is irrelevant
Question 2
Organizations that provide duct installation standards and guidelines include:
A) EPA and OSHA.
B) ACCA and SMACNA.
C) Underwriters Laboratories and the National Fire Protection Association.
D) AHRI and HVAC Excellence.
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