Blueprint Flashcards
What type of estimating for large jobs usually begins 3 to 4 years in advance of the actual start of the project?
Rough Order of Magnitude (ROM) estimating
What must be completed after the ROM estimate is entered?
Risk assessment factors
What are 2 basic techniques for putting an estimate together?
Top down estimate & bottom up estimate
When pricing out a job, what are 2 categories of pricing?
Preliminary Estimates & detailed estimates
What are 3 requirements to include in a detailed estimate?
A task list, material take-off, & pricing sheets for each task item plus labour
Is it common practice to submit an un-priced copy of your bid proposal and your proposal letter to the general contractor 3 to 4 days before the bid closing date?
Yes
What is the most reliable or best type of estimate?
Detailed estimate
When you are calculating a job and you wish to make a 10 percent profit, do you add 10 percent to the selling price?
No
What does a title block contain?
Scale, project address, & sheet identification number
What would the sheet identification number A-6 on the bottom right of a blueprint mean?
The 6th page of architectural drawings
What height are floor plans in a kitchen drawn at?
4 feet
Information on the furnace location would be found on what part of a blueprint?
The foundation plan
If there is a discrepancy between the blueprint and what is on the specifications which one should you go by?
The specifications
What is the key to an accurate material list?
Organization
What are 2 things that must be completed before you can create a material list?
Heat loss calculation & duct design
What are 5 ways that air can be conditioned?
Heating, cooling, filtering, humidifying, & de-humidifying
How often should round supply duct be supported?
Every 5 inches
What are 2 reasons for using a return air rail?
Provides backing for return air grilles & ensures that the dry wallers cut out the hole
What type of vent do low & mid efficient furnaces use to remove the products of combustion?
B-vents
What type of vent do high efficient furnaces use to remove the products of combustion?
Special plastic venting
Why must an insulated duct be specified for the entire length of a fresh air duct?
Because condensation will form on the duct otherwise
What is the most efficient type of duct?
Round
What is the combustion air termination used for?
To keep cold air from dropping into the furnace room
Installations requiring you to run forced air heating under concrete slab are known as what?
Underslab heating
What is combustion air?
The air that furnaces require to fuel the fire inside of them
An entire underslab ducting system must slop what way back to the furnace?
It must slope back to the furnace
When a return air branch run is finished on the bottom with a dry wall ceiling, what is the bottom of the branch run finished with?
Light gauge metal
What is the uncontrolled leakage of air from a building called?
Exfiltration
What type of ductwork should be coming off the plenum for underground heating installations?
Round
What is the heart of a HVAC system?
The air re-circulation fan
What should the ratio between the width and the depth of duct never exceed?
4:1
Dynamic losses on flexible duct are how many times as great per foot as in smooth duct?
10 times greater
What piece of equipment is used to change fuel into heat energy?
A furnace
Where are perimeter loop systems mostly found?
In underslab heating situations
What is the most common distribution system that is used today?
An extended plenum system
What is the heating value of natural gas?
1000 Btu/ft3
What is the heating value of propane?
2500 Btu/ft3
What is the burner of choice for high rates of combustion in an oil furnace?
Atomizing burner
What is the minimum efficiency of a gas furnace allowed to be manufactured and sold in Canada?
78 percent
What are high efficiency gas furnaces also known as?
Condensing furnaces
What are 3 types of gas fire places?
Free standing, zero clearance, and insert fireplace
The safety of workers and job sites is governed by which code?
OH&S
The installation of gas appliances & piping is governed by which code?
B149.1-05 CAN/CSA
Which agency conducts tests and certifies products used by consumers?
CSA & ULC
Which agency conducts tests & writes standards specifically for the HVAC industry?
SMACNA
Which agency conducts tests & writes standards related to fire protection?
NFPA
What is the stage of the job called where the penetrations to the exterior are installed?
The rough-in stage
What is the stage of the job called where the furnace is placed in a permanent position?
The ductwork stage
What is the stage of the job called where the thermostat is mounted permanently?
The final stage
Underslab heating systems grade which way from the furnace?
Towards the furnace
Whose responsibility is it to ensure the job is done properly and to the applicable code?
The installer
B-vent requires how much clearance to combustible materials?
1 inch
A single wall vent connector on a wood burning application requires how much clearance to combustibles?
18 inches
How much clearance do you need between an exhaust hood and the regulator vent on a natural gas or propane line coming into a building?
3 feet
How much clearance do you need between a mechanical fresh air intake hood and the regulator vent on a natural gas or propane line coming into a building?
10 feet
What is the distance required between a fresh air connection to the furnace and the furnance fan inlet if the air is not connected through an approved mixing device?
10 feet
