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59 Cards in this Set
- Front
- Back
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What is the minimum dimension of a chimney if it is not round? |
2” |
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What is the minimum size diameter of a vent or vent connector? |
3” |
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What is the purpose of the General Venting Requirements?
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To adjust the sizing tables to reflect variations in the installation |
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When using rule of thumb sizing , how is the size of the vent connector serving a single appliance determined? |
It’s always the same size as the draft hood outlet |
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When using ROT , how is the size of the vent connector serving a single appliance with multiple draft hood outlets determined? |
It’s the combined area of all outlets |
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When using ROT sizing what is the minimum size chimney serving a single appliance ? |
One size larger than the vent connector |
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Using ROT what is the formula used to Size a vent serving multiple appliances ? |
100% of the area of the largest appliance output and 50% of the sum of the additional outlet areas. |
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What is the minimum size (area) of a chimney? |
12 inches square |
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What is the maximum size of a masonry chimney for a given installation? |
Not to exceed the appliances input by more than 25% |
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Do the self test questions |
**** face |
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What is the smallest size opening grille used for air supply? |
1/4” |
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What is the minimum distance above grade for an air supply inlet? |
12” |
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Where must the combustion air pot be located when the total appliance input is less than 400 MBH? |
Within 1 foot above and 2 feet away from the largest appliance burner. |
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When air supply is brought into the mech room by the through a transfer grill from type B ( loose construction) building , how is the size of opening calculated ? |
The opening shall not be less than 1”sq for every 1000 BTU’s if appliance input. |
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Where would the transfer grill in the last question be located ? |
Between 12” and 18” off floor level. |
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How is , in a draft hood hood appliance in a loosely constructed building , air supply sized? |
Two openings , one off the floor and one opening close to the ceiling sized 1 in sq for each 1000 BTU of appliance input |
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Category 1 appliances installed in an enclosure have a total input of 525,000 BTU’s . What size of outdoor air supply is needed? |
75 sq inches |
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What is the formula to determine for Air supply sizing for appliances more than 400MBH? |
1sq”for every 7000 BTU up to a million. Any BTU over that million is 1 sq” for every 14000 bTU. Add the two together for the total square inches. |
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What size of outdoor combustion air supply is required for a power burner appliance with 1,500,000 BTU’s? |
1,500,000/30,000= 50 sq” |
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How is VENTILATION Air for appliance installations over 400MBH sized? |
It is sized at 10% of the air supply size but not larger than 10” square |
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What is the smallest area allowed for a square or rectangular air supply? |
9inches square |
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What is the smallest dimension of a square or rectangular air supply ? |
3X3” |
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What is the formula for sizing air supply for Power Burner appliances ? |
1 square inch for every 30,000 BTU |
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Using ROT, what size of vent is required for a single appliance with a draft hood outlet of 4” diameter ? |
4”, same size as the draft hood outlet |
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A draft Hood appliance with a 5”outlet and a draft hood appliance with a 3” outlet are connected to a common vent through separate vent connectors. Using ROT what size is the vent for this? |
5X5=25 3X3=9/2=4.5 25+4.5=29.5 6X6+36” 6” |
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A venting system has a common vent connector and common vent offset . How much would the values in the vent sizing tables be reduced ? |
A total of 30% |
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TOT |
Total of 30% |
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How much reduction of the vent sizing table is required for a corrugated chimney liner? |
20% |
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ROT vent sizing methods only apply to _________ appliances |
Natural Draft Hood |
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ROT sizing method for single appliance connected to a chimney |
Vent connector same size as draft hood and chimney shall be one size larger. |
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ROT sizing method for two or more appliances connected to a chimney: |
Each appliance the same as draft hood and chimney is the 100% the size of the largest and 50% of the area of the other appliances . |
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The ROT method for a COMMON VENT CONNECTOR :
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Area of common vent is equal to 100% of the area of All the appliances |
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What is required when a mechanical air supply duct is used? |
The mechanical unit must be interlocked with the appliance it serves. |
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A vent terminal must be at least ________ feet above any obstruction within ______feet of the terminal |
2 10 |
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A chimney terminal must be at least _____ feet above a roof and at at least ______ feet above any obstruction within _____ feet. |
2 3 10 |
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The minimum gauge material used for a vent connector must be ____________ or ________. If no dilution Air is entrained the minimum guage is _____ and must be at least ______ for an incinerator. |
28 GSG 22!B&SG 24 GSG 20 GSG |
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A ventilated thimble must be at least 4” larger than the vent connector if it is less than ______ feet long. |
6 |
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A ventilated thimble must be must be ____larger than the vent connector if it is more than _____ feet long. |
2” 6 |
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The DP column must be used to size a vent connector or vent in an air tight building when ________ appliances are installed. |
Draft Hood |
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Category II, III and IV appliances are sized by ________________, not the code |
Manufacturers certified instructions |
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Table |
Combustion/Dilution Air requirements for appliances having DRAFT CONTROL DEVICES with a combined input up to 400,000 BTU Always use round column |
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Table 8.2 |
Combustion air requirements for appliances NOT having draft control devices when the combined input is up to 400MBH Always use round pipe column |
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Table C.1 |
Capacity of type B vents with B-Vent connectors serving a single category 1 appliance. |
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Table C.2 |
Capacity of B-vents with single wall ( c vent) vent connectors serving a single Category 1 appliance. |
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Table C.3 |
Capacity of type B double wall vents with Type B double wall vent connectors serving two or more category 1 appliances |
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Table C.4 |
Capacity of double wall ( B VENT) with Single wall (C VENT) vent connectors serving 2 or more category 1 appliances . |
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Minimum clearance for single wall ( c vent ) is _____”. For double wall (b vent ) it is __”. C Vent clearance may be reduced to ___” if combustibles are protected. |
6” 1” 2” |
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Special Venting Systems used for category 3 and 4 appliances must be certified to the ____/____ standard. |
CSA/ULC S-636 |
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Types of piping allowed for category 2,3 and 4 appliances |
Stainless Steel System 636 |
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Max allowable pressure drop for category 1 appliances? |
5 pascal, -0.02” (-0.5mm) |
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The resistance of a 90• elbow is equivalent to ______’ |
10 feet |
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Each additional elbow installed to the vent connector requires the tables to be reduced ____% for draft hood appliances |
10% |
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Each additional elbow installed to the vent connector requires the tables to be reduced ____% for fan assisted appliances |
15% |
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Whenever the vent connectors from two or more appliances (common header), the reduction will be _____% |
10% |
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Length of the header or common vent connector manifold should not exceed ______ for each inch of diameter. |
1.5’ |
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An offset results in a reduction of _____ or 2 elbows. |
20% |
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If an appliance is not rated for high altitude it must be de-rated by____% |
10% |
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Chimney liners result is a reduction of ______% |
20% |
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Good luck |
**** face |
