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What extra protection is needed when velocity in a duct exceeds 4000 FPM?
Metal nosing.
What do HVAC shop drawings show that blueprints don’t normally?
Duct length & throat radii.
What is needed for square heel square throat duct?
Hat sections in cheeks.
What is the main cause of noise in HVAC units?
Air turbulence.
Secure rooftop equipment against earthquakes & ________?
Wind.
When cutting insulation for square/ rectangular duct You should cut it?
a) slightly shorter
b) slightly longer
c) 1/2” shorter
Slightly longer
Before putting HVAC units on a rooftop curb, first put down?
Closed cell foam tape.
What is the coating that forms on stainless steel?
Oxide.
What are angle iron flanges used to bolt heavy gauge fittings together?
Companion
Vanstone
Pittsburgh
Standing seam
What are lines that represent edges called?
Element lines
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