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22 Cards in this Set
- Front
- Back
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If it is necessary to convert a section of flexible duct trunk line to a rectangular metal duct the connection point should be fitted with a?
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Sheet metal square to round transition
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The thickness of duct insulation is governed by ___________ codes.
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Municipal
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A transverse joint is used to connect _________ end to end.
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Ductwork
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Metal ductwork used in heat only application covered with fibrous insulation must be insulated to local code and a vapor barrier added to eliminate ___________.
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Condensation
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Location of condensate drains is typically covered by ________ codes.
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Local
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The UMC states that condensate drains must have a pitch of 1/8"" per foot as well as the size and location of the pipe used for _________ drains.
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Secondary
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What is the minimum diameter of schedule 40 pipe used in secondary drains.
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3/4"
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The UMC states that secondary drains should terminate in a _________ spot for the homeowner to see.
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Conspicuous
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The UMC states that an attic-mounted furnace must have a permanently mounted lighting fixture. The switch that controls the light must be located at the required __________ opening.
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Passageway
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Cloth tape and mastic must be used when sealing interior joints of chases and _________ ducts.
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Return
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An Extended Plenum Duct system extends in 1 or 2 directions and has multiple ________ ducts
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Branch
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Fiberglass ducts are connected to sheet metal ducts using ________ and __________.
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Sheet metal screws and Washers
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The UMC states that All ductwork must be mechanically _______ and ________.
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Connected and Sealed
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A basic ductboard trunk utilizes 3 _______ grooves and 1 shiplap joint on one corner
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V
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The shiplap joint of a ductboard trunk must have a ______ in staple flap and stapled with ______" minimum outward clinching staples
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3in, 1/2in
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Flex ducts should be supported every ______ feet maximum with a metal strap or saddle of 1 1/2" minimum.
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5
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The maximum sag of flexible duct is ____ per foot.
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1/2 inch
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When running Flex Duct vertically is must be supported every _____ feet and may not be used as a riser over _______ stories
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6 feet , 2 stories
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Flex duct may rest on joists as long as the 5 foot rule applies. True or False
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True
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Pressure sensitive aluminum foil tape can be used on flex or metal ducts. True or False
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True
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Heat activated aluminum foil tape is used for ductboard joints. True or False
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True
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Mastic and Glass fabric tape system is used on any mechanical joint metal, ductboard or combination of both.
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True
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