Appliance Venting Part A And B Flashcards
What is a category 1 appliance
Operates with a negative vent static pressure and a flue loss of no less than 17%
What does category 1 appliances consist of?
Draft hood equipped appliances, and fan assisted appliances for venting into B vents
What is a forced draft
A mechanical draft produced by a device upstream from the combustion zone
What is induced draft
A mechanical draft produced by a device DOWNSTREAM from the Comobution zone
Natural draft is?
Any draft other than mechanical
Another name for stack action, what is it?
Motive power, the suction in the flue caused by the products of combustion
What is the most biggest problem with venting
Condensation
2 types of barometric draft controls
Single acting and double acting
What does a double acting barometric act do and how does it work
Swings 2 ways inwards and outwards, when it swings inwards, it lets diluation air in, if spillage occurs the damper swings outwards allowing combustion into the mech room rather then back to combustion zone
What does a single acting barometric damper do and how does it work
Only swings inward, allows dilution AIT into the vent
Barormatric damper can only be used appliances that have what?
Been certified by the manufacturer for such use
How can venting gas appliances be accomplished.
Through convection or mechanical induction. Mechanical uses a
What is the total vent height
Min of 5’ft measured from the height of the draft hood or flue collar to where it vents outside
What is b vent made of
Inner lining is made of aluminum the outer wall is constructed of galvanized iron
Maximum allowable flue gas temp for b vent
470f°
Difference between b and bw vent
Bw is oval and has a smaller clearance
B vent is 1” BW is ½”
2 types of chimneys
Factory built and field constructed.
What is a vent
A vent for chimneys made of an inner liner of stainless steel and an outer layer of gal iron. 1” thick layer of mineral Fibre insulation between the 2 layers
What is super A vent
The most commonly used style of manufactured chimneys. Inner and outer layer made of stainless steel and insulated with 2” fiber insulation.
What is the recommended grade for BH venting
¼”
What is 8.18.17 what venting does it apply to
A METAL vent connector shall not be installed without dips or sags
What is a field built chimney
A chimney constructed of brick, stone, concrete, glazed tile or approved masonry units
C.2.12
What is a coaxial pipe
A single wall metal vent pipe installed inside another single wall metal air supply pipe.
Min distance from grade for direct vent, what can you use to achieve that
12” a snorkel fitting
A vent terminal cannot be located where?
Within 6ft of a mechanical air supply
A vent shall not terminate within what of a service regulator
3ft
The fresh air inlet connected to the return air duct is not considered a what
Mechanical air supply inlet
