Various Practice Assignments (CODE) Flashcards
Can a draft hood be used with an appliance that needs a positive overtire draft or induced draft?
NO
if an appliance requires a draft hood and it is not supplied, who can supply it?
manufacturer or installer
Can a draft hood be substituted for a draft regulator?
No
Can a draft hood be supplied by the manufacturer for an appliance altered?
No
what device is required when a power exhauster is used in place of natural draft vent?
flow switch
Can you discharge the products of combustion into a large adequately ventilated space?
Yes, max input not exceed 20btuh
What type of draft regulator is required on an incinerator?
Single acting barometric
When commissioning a barometric damper, what instrument should be used to set the draft and where should the draft measurement be taken?
Magnehelic/ draft gauge/manometer
- combustion fire
- flue outlet before damper
If we are adjusting draft on a barometric damper, and we want to increase the draft, what should we do?
Add weight to choke dilution and increase draft
When can an electrically operated vent damper be used in a dwelling unit?
where device provided is an integral part of appliance
If an appliance has an automatic flue damper what is required prior to the ignition of the main burner?
Flue damper must be in open position and proved by end/flow switch
How are air supply requirements for a direct vent appliance determined?
Table 8.1 of CSA B149.1
Table 8.2 of CSA B149.1
Clause 8.2.6 of CSA B149.1
Manufacturer’s literature
d
What is the minimum required free area of a square combustion air opening?
3 in2 (1 900 mm2)
6 in2 (3 900 mm2)
9 in2 (5 800 mm2)
10 in2 (6 500 mm2)
c
The combustion air supply for a less than 400 MBtu/h installation must terminate within __________ above, and within ____________ horizontally from the burner level of the appliance having the largest input.
1 ft (300 mm), 2 ft (600 mm)
2 ft (600 mm), 3 ft (1 m)
3 ft (1 m), 4 ft (1.2 m)
4 ft (1.2 m), 5 ft (1.5 m)
a
What is the smallest opening dimension in a fixed louvre, grille, or screen?
1/8 inch (3.2 mm)
1/4 inch (6.4 mm)
1/2 inch (12 mm)
1 inch (25 mm)
b
Under what conditions can a gas-fired appliance be installed in a building and not have a separate combustion air supply?
Tight building of sufficient volume
Loose building of less than 1000 ft2
Loose building of sufficient volume
Tight building appliance in an enclosure
c
When compared to the air supply opening, what is the minimum cross-sectional area of the ventilation air opening for an appliance over 400 MBtu/h?
5% or 5 in2
10% or 10 in2
20% or 20in2
50% or 50 in2
b
Does a Category I appliance have a flue vent pressure that is above or below atmospheric
pressure?
below
Does a Category IV appliance have a flue vent pressure that is above or below atmospheric
pressure?
above
Is a Category I appliance considered condensing or non-condensing?
non-condensing
Is a Category I appliance considered condensing or non-condensing?
non-condensing
In what section of the B149.1 can you find code for venting systems?
section 8
In What section of the B149.1 can you find General Venting Requirements and Vent Sizing
Tables?
Annex C
What is “C” vent referred to in the vent sizing tables?
single wall
Can C-vent pass through a ceiling? If so, explain clearances and special materials required.
NO
Can C-vent pass through a wall? If so, explain clearances and special materials required
yes. clauses attached
What type of fuel is A-vent suitable for?
solid, liquid, or gaseous
What is the minimum clearance for an A-vent?
1”
What is the minimum size in diameter allowed for a vent?
3”
Can B-vent (double wall) be used as a chimney liner?
yes
max b vent temp
470f
What is the maximum temperature for Class II Type BH vent?
135C
What is the maximum temperature for Class II (b) Type BH vent?
90C
What Category appliance can BH be used on?
2,3,4
What is the inside wall of a B-vent constructed of?
aluminum
Can B-vent be used as a chimney liner?
yes
If a corrugated metal chimney liner is used, what are the capacities of the applicable tables
reduced by?
20%
What is the minimum clearance from combustibles for a Type B-vent connector?
1”
What is the inside wall of an L-vent made of?
stainless steel
What Category appliance does the vent sizing tables only deal with?
category 1
Can a Category III appliance be sized using the tables in Annex C?
no
If a vent connector for a fan assisted appliance has the equivalent of three 90° turns, what must
be done to the appropriate table to ensure the vent is properly sized
reduce tables by 15%
If a vent connector for a fan assisted appliance is sized smaller than the flue collar it serves, what
should be done to the maximum capacity listed in the tables to ensure the vent is still adequate?
reduced 10%
What does ACF mean?
altitude correction factor
What is generally accepted as the ACF for below 1000 feet above sea level?
1.08
How to remember the gas laws?
very tight pants = very tight pants
1,2,1 = 2,1,2
Boyles: easy
Gay: No V
Which vent type can withstand the highest flue gas temperature?
Type A vent
Type B vent
Type C vent
Type L vent
a
What is the maximum input of an appliance being vented through an exhaust canopy?
12 kW
40 kW
120 kW
400 kW
c
How are the joints on a C-vent secured?
Gear clamps
Three screws
Locking bands
Solvent cement
b
How are the joints on a BH Class II, A and B temperature rated, vents secured?
Gear clamps
Three screws
Locking bands
Solvent cement
d
How are the joints on a BH Class II, C temperature rated, vents secured?
Gear clamps
Three screws
Locking bands
Solvent cement
c
How are the joints on a BH Class II, D temperature rated, vents secured?
Gear clamps
Three screws
Locking bands
Solvent cement
a
What type of vent is used with a recessed wall furnace?
Type B vent
Type L vent
Type BH vent
Type BW vent
d
What is the maximum vent gas temperature for Type L vents?
90 °C (195°F)
110 °C (230°F)
243 °C (470°F)
288 °C (550°F)
d
What is the maximum vent gas temperature for Type BH Class IIB vents?
90 °C (195°F)
110 °C (230°F)
243 °C (470°F)
288 °C (550°F)
a
What is the maximum vent gas temperature for Type B vents?
90 °C (195°F)
110 °C (230°F)
243 °C (470°F)
288°C (550°F)
c
What is the maximum vent gas temperature for Type BH Class IIC vents?
90 °C (195°F)
110 °C (230°F)
243 °C (470°F)
288 °C (550°F)
b
What type of BH vent is CPVC?
Class I
Class II A
Class II B
Class II C
c
What type of BH vent is Polypropylene?
Class I
Class II A
Class II B
Class II C
d
What type of BH vent is PVC?
Class I
Class II A
Class II B
Class II C
b
Except for a BH vent, what is the minimum height a vent must terminate above a flat roof?
450 mm
600 mm
900 mm
1500 mm
b
What is the minimum height a chimney must terminate above a flat roof?
450 mm
600 mm
900 mm
1500 mm
c
For a positive pressure BH vent, what is the minimum termination height above a flat roof?
450 mm
600 mm
900 mm
1500 mm
a
What is the minimum horizontal clearance from an obstruction to a vent termination without increasing the height?
2 ft (0.6 m)
4 ft (1.2 m)
8 ft (2.4 m)
10 ft (3.6 m)
d
As per Table 8.6 what is the minimum Type C vent connector clearance for a boiler?
25 mm
75 mm
150 mm
225 mm
c
