CSIA C-DET LATEST EXAMS PAPER QUESTIONS AND
ANSWERS FIRM A+
✔✔Properly described as a duct system used to discharge, Key, moisture and
combustion by products from clothes dryer to the outside of a home or building -
✔✔What is a dryer exhaust system?
✔✔Replaced with metal ductwork - ✔✔If existing ductwork is plastic, nonmetal or a
combustible, it should be _________ _______ _________ _________
✔✔Independent - ✔✔Dryer exhaust system should be _____________ of all other
venting system
✔✔No - ✔✔Can a dryer be connected to a Masonry chimney?
✔✔Rigid transition duct shall be conducted of minimum 0.016 inch thick (28 gauge) rigid
metal duct pipe, having smooth interior surfaces with joints, running in the direction of
the airflow. - ✔✔What should rigid transition duct be constructed of?
✔✔Shall be use the transition ducts - ✔✔What shall flexible duct connectors be used
for?
✔✔Metallic, 8 feet - ✔✔Flexible duct connectors use as transition duct shall be
__________, not more than ____ feet in length, and an approved type
✔✔No - ✔✔Can metallic, flexible duct be concealed within construction
✔✔To the outside air - ✔✔Where should both type 1 and type 2 clothes dryer
exhausted too.
✔✔Mechanically
Heat resistant metal tape - ✔✔IRC states that dryer exhaust duct joints ___________
fasten, and sealed with ________ __________ __________ ________
✔✔1/8" - ✔✔IRC states screws and rivers or similar fasteners, showing up protrude
more than _______ into the inside of the duck
✔✔NFP to 11 states that these fasten devices shall not be used - ✔✔What does the
NFPA 211 State regarding dryer exhaust ducks in the use of metal screws of other
fastening means that extend it to the duct
✔✔4 inches unless specified differently in the manufacturers instructions - ✔✔What is
the minimum diameter for a dryer exhaust duct?
, ✔✔pi r squared - ✔✔What is the calculation used for the area of a duct outlet?
✔✔3.14 - ✔✔What is the calculation for Pi
✔✔Pi r squared
Pi = 3.14 - ✔✔Area of duct outlet calculation
✔✔4 inch duct = 3.14×2×2. - ✔✔4 inch duct calculation
✔✔3 inch duct equals 3.14×1.5×1.5. - ✔✔3 inch duct calculation
✔✔Smooth - ✔✔What type of surface should the interior finish be in a dryer duct?
✔✔Rigid Galvanized
Aluminum - ✔✔The entire exhaust system should be supported and secured in place
and use __________ _________ pipe or ___________ construction.
✔✔Away from the dryer, or the direction of airflow - ✔✔Which way should the mail end
of the dryer ducts joints face
✔✔self-closing damper
door - ✔✔Exhaust duck should end with an exhaust hood that has a _________-
_________ _________ or _________ to prevent Backdraft in the entry of birds, rodents,
or wildlife.
✔✔Heads with magnetic or mechanical closing devices - ✔✔You should never what
type of exhausted hood?
✔✔12" - ✔✔What is the clearance of an exhaust hood to the bottom of the ground or
other instructions?
✔✔The duck should be insulated and slope, slightly downward towards exhausted -
✔✔Exhaust duct work must run through an unheated area. How should it be installed?
✔✔They cannot be a second fuel burning appliance in a closet - ✔✔If the dryer is
located in the closet, can there be another fuel burning a appliances located in the same
closet?
✔✔100 square inches must be provided in the closet enclosure for make up air -
✔✔When a dryer is installed in a closet, how large of an opening is required for make
up air
ANSWERS FIRM A+
✔✔Properly described as a duct system used to discharge, Key, moisture and
combustion by products from clothes dryer to the outside of a home or building -
✔✔What is a dryer exhaust system?
✔✔Replaced with metal ductwork - ✔✔If existing ductwork is plastic, nonmetal or a
combustible, it should be _________ _______ _________ _________
✔✔Independent - ✔✔Dryer exhaust system should be _____________ of all other
venting system
✔✔No - ✔✔Can a dryer be connected to a Masonry chimney?
✔✔Rigid transition duct shall be conducted of minimum 0.016 inch thick (28 gauge) rigid
metal duct pipe, having smooth interior surfaces with joints, running in the direction of
the airflow. - ✔✔What should rigid transition duct be constructed of?
✔✔Shall be use the transition ducts - ✔✔What shall flexible duct connectors be used
for?
✔✔Metallic, 8 feet - ✔✔Flexible duct connectors use as transition duct shall be
__________, not more than ____ feet in length, and an approved type
✔✔No - ✔✔Can metallic, flexible duct be concealed within construction
✔✔To the outside air - ✔✔Where should both type 1 and type 2 clothes dryer
exhausted too.
✔✔Mechanically
Heat resistant metal tape - ✔✔IRC states that dryer exhaust duct joints ___________
fasten, and sealed with ________ __________ __________ ________
✔✔1/8" - ✔✔IRC states screws and rivers or similar fasteners, showing up protrude
more than _______ into the inside of the duck
✔✔NFP to 11 states that these fasten devices shall not be used - ✔✔What does the
NFPA 211 State regarding dryer exhaust ducks in the use of metal screws of other
fastening means that extend it to the duct
✔✔4 inches unless specified differently in the manufacturers instructions - ✔✔What is
the minimum diameter for a dryer exhaust duct?
, ✔✔pi r squared - ✔✔What is the calculation used for the area of a duct outlet?
✔✔3.14 - ✔✔What is the calculation for Pi
✔✔Pi r squared
Pi = 3.14 - ✔✔Area of duct outlet calculation
✔✔4 inch duct = 3.14×2×2. - ✔✔4 inch duct calculation
✔✔3 inch duct equals 3.14×1.5×1.5. - ✔✔3 inch duct calculation
✔✔Smooth - ✔✔What type of surface should the interior finish be in a dryer duct?
✔✔Rigid Galvanized
Aluminum - ✔✔The entire exhaust system should be supported and secured in place
and use __________ _________ pipe or ___________ construction.
✔✔Away from the dryer, or the direction of airflow - ✔✔Which way should the mail end
of the dryer ducts joints face
✔✔self-closing damper
door - ✔✔Exhaust duck should end with an exhaust hood that has a _________-
_________ _________ or _________ to prevent Backdraft in the entry of birds, rodents,
or wildlife.
✔✔Heads with magnetic or mechanical closing devices - ✔✔You should never what
type of exhausted hood?
✔✔12" - ✔✔What is the clearance of an exhaust hood to the bottom of the ground or
other instructions?
✔✔The duck should be insulated and slope, slightly downward towards exhausted -
✔✔Exhaust duct work must run through an unheated area. How should it be installed?
✔✔They cannot be a second fuel burning appliance in a closet - ✔✔If the dryer is
located in the closet, can there be another fuel burning a appliances located in the same
closet?
✔✔100 square inches must be provided in the closet enclosure for make up air -
✔✔When a dryer is installed in a closet, how large of an opening is required for make
up air
