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20 Cards in this Set
- Front
- Back
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What extra protection is needed when velocity in a duct exceeds 4000 FPM? |
Metal nosing. |
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What do HVAC shop drawings show that blueprints don’t normally? |
Duct length & throat radii. |
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What is needed for square heel square throat duct? |
Hat sections in cheeks. |
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What is the main cause of noise in HVAC units? |
Air turbulence. |
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Secure rooftop equipment against earthquakes & ________? |
Wind. |
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When cutting insulation for square/ rectangular duct You should cut it? a) slightly shorter b) slightly longer c) 1/2” shorter |
Slightly longer |
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Before putting HVAC units on a rooftop curb, first put down? |
Closed cell foam tape. |
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What is the coating that forms on stainless steel? |
Oxide. |
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What are angle iron flanges used to bolt heavy gauge fittings together? Companion Vanstone Pittsburgh Standing seam |
Companion |
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What are lines that represent edges called? |
Element lines |
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When laying out a pattern for a gutter miter, what is required? |
Plan & profile view. |
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What is used when soldering new galvanized steel? |
Hydrochloric acid |
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With soft solder, what does 60/40 mean? |
60% tin 40% lead |
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Toggle bolts are typically used in? |
Hollow block walls |
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What is the required slope for effective eaves trough (gutter) drainage? |
1/4” per Foot |
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What is a blow horn stake used most often to form? |
Funnels |
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To find the minimum length of an offset, multiply what? |
Offset x 4 |
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What soldering flux is used for old galvanized metal? |
Zinc chloride (zinc adds weatherproofing) |
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When punching metals, the punch list penetrate at least ____ % of the material thickness before the slugs snaps out? |
40% |
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What seam is not used for roofing? Batten Standing Flat Groove |
Groove |
