Mechanical journeyman (test
1) latest updated version
with expert solutions
An installer has an 80,000 Btu per hour input appliance
with a 4 - inch - diameter draft hood outlet that needs to
be vented into a 12 - foot- high Type B vent . The vent
connector has a 5 - foot lateral length and is also Type B.
Can this appliance be vented using a 4 - inch - diameter
vent ? - answer Yes
Plastic fire sprinkler piping exposed within a plenum shall
be used only in______________systems and shall have a peak
optical density not greater than 0.50 , an average optical
density not greater than 0.15 , and a flame spread of not
greater than 5 feet ( 1524 mm ) when tested in
accordance with UL 1887. Piping shall be listed and
labeled . - answer Wet pipe
An inside tank provided with fill and vent pipes shall be
provided with a device to indicate____________ at the fill
point when the oil in the tank has reached a
predetermined safe level . - answer Visually or audibly
Where vents pass through insulated assemblies an
insulation shield constructed of not less than ________ gage
sheet metal shall be installed to provide clearance
between the vent and the insulation material - answer 26
gage
, A means of access shall be provided to an energy recovery
ventilation system as required for_______ - answer
Replacement, repair, maintenance, and service
35,000 btu per hour input draft - hood - equipped water
heater with a 4 - inch - diameter draft hood outlet , 2 feet
of connector rise , and 4 feet of horizontal length is to be
common vented with a 100,000 btu per hour fan - assisted
furnace with a 4 - inch - diameter flue collar , 3 feet of
connector rise , and 6 feet of horizontal length . The
common vent consists of a 30 - foot height of type b vent .
What are the recommended vent diameters for each
connector and the common vent ? The installer would like
to use a single - wall metal vent connector . - answer
Water Heater Vent Connector Diameter : 4 inch , Furnace
Vent Connector Diameter : 4 inch , Common Vent Diameter
: 5 inch
Dryer exhaust ducts for clothes dryers shall terminate on
the outside of the building and shall be equipped with a -
answer Back draft damper
The type of refrigerant in refrigeration systems having a
refrigerant circuit containing more than 220 pounds of
Group A1 or_________pounds of any other group refrigerant
shall not be changed without prior notification to the code
official and compliance with the applicable code provisions
for the new refrigerant type . - answer 30 pounds
Screens shall not be installed at the duct termination for a
clothes dryer vent . - answer True
1) latest updated version
with expert solutions
An installer has an 80,000 Btu per hour input appliance
with a 4 - inch - diameter draft hood outlet that needs to
be vented into a 12 - foot- high Type B vent . The vent
connector has a 5 - foot lateral length and is also Type B.
Can this appliance be vented using a 4 - inch - diameter
vent ? - answer Yes
Plastic fire sprinkler piping exposed within a plenum shall
be used only in______________systems and shall have a peak
optical density not greater than 0.50 , an average optical
density not greater than 0.15 , and a flame spread of not
greater than 5 feet ( 1524 mm ) when tested in
accordance with UL 1887. Piping shall be listed and
labeled . - answer Wet pipe
An inside tank provided with fill and vent pipes shall be
provided with a device to indicate____________ at the fill
point when the oil in the tank has reached a
predetermined safe level . - answer Visually or audibly
Where vents pass through insulated assemblies an
insulation shield constructed of not less than ________ gage
sheet metal shall be installed to provide clearance
between the vent and the insulation material - answer 26
gage
, A means of access shall be provided to an energy recovery
ventilation system as required for_______ - answer
Replacement, repair, maintenance, and service
35,000 btu per hour input draft - hood - equipped water
heater with a 4 - inch - diameter draft hood outlet , 2 feet
of connector rise , and 4 feet of horizontal length is to be
common vented with a 100,000 btu per hour fan - assisted
furnace with a 4 - inch - diameter flue collar , 3 feet of
connector rise , and 6 feet of horizontal length . The
common vent consists of a 30 - foot height of type b vent .
What are the recommended vent diameters for each
connector and the common vent ? The installer would like
to use a single - wall metal vent connector . - answer
Water Heater Vent Connector Diameter : 4 inch , Furnace
Vent Connector Diameter : 4 inch , Common Vent Diameter
: 5 inch
Dryer exhaust ducts for clothes dryers shall terminate on
the outside of the building and shall be equipped with a -
answer Back draft damper
The type of refrigerant in refrigeration systems having a
refrigerant circuit containing more than 220 pounds of
Group A1 or_________pounds of any other group refrigerant
shall not be changed without prior notification to the code
official and compliance with the applicable code provisions
for the new refrigerant type . - answer 30 pounds
Screens shall not be installed at the duct termination for a
clothes dryer vent . - answer True
