How many inches of water column does it take to equal one psi of gas pressure?

27.7"

30"

27.3"

27"

What is Zero pressure based on when using instruments?

Local atmospheric

Pressure controls

Tool safety

Load zone

What is the key underlying principle of airflow?

Pressure difference

Pressure of airflow

Pressure of venting

1 psi is equal to how many kPa?

6.895

6.734

6.298

6.982

What does Draft intensity mean?

The difference in pressure from zero atmospheric pressure

The difference in pressure from ultimate atmospheric pressure

The difference in pressure from draft regulators

What type of fluid does an incline manometer usually employ?

Water

Oil

Propane

Co2 fuild

What piece of documentation must be kept with any and all draft measuring equipment?

A record of calibration

A record of emplyment

A record of history

Passport

All draft measuring instruments employ what common piece of equipment?

A rubber hose for sampling

A manometer

A toolbox

Reamer

In most appliances, what should the overfire draft be, positive or negative?

A slight negative

A slight possitive

Very negative

Very positive

Too high an overfire draft will do what to efficiency?

Reduce it

Make it stronger

It will do nothing

Cause a fire

What type of draft is required to ensure consistent air supply?

Steady minimum draft

Steady maximum draft

Total control draft

Direct draft

Who gives the recommended readings for a breech draft?

The manufacturer

The code book

You can make it

House owner

What’s draft loss mean?

Draft loss= over fire draft-breech draft

Draft loss= breech draft + over fire draft

Draft loss= breech draft- over fire draft

Draft loss= breech draft/overfiredraft

What’s the definition of natural draft?

Draft that occurs without the aid of mechanical devices

Draft the occurs with the aid of mechanical devices

Draft is measured in the chimney

What are the two main types of natural draft?

Thermal & currential

Thermal & convection

Currential & convection

Convection & induced

What’s the definition of thermal draft?

Draft produced by hot gasses rising

Draft produces by cold air rising

Draft produced by hot gasses dropping

Draft produced by cold gasses dropping

What’s currential draft?

Draft created when wind blows into the top of chimney

Draft created when it blows into the garage

Draft created when air blow out the chimney

Draft created when hot air get stuck in chimney plenum

What’s positive currential draft cause?

Downdraft or backdraft

Overcurrent and oversurge

Downdraft and oversurge

Backdraft and overcurrent

What two ways can a mechanical blower move air through a system?

Pushing and pulling

Back and front

Top and bottom

What does a blower do to the air on an induced draft system?

It pulls/induces the air through the appliance

It blows the air through the home

It keeps it in the system

What’s it called when a blower pusher or forces air through the system?

Forced draft

Induced draft

Complete draft

Regulate draft

How does a draft regulator control draft?

It dilutes hot flue gases with room temp air

It dilutes cold flue gases with room temp

It dilutes hot air with room temp

It dilutes cold air with room temp

What’s the other name for a draft regulator?

Barometric danper

Draft regulation

Inducder draft

Barometer

Using a draft regulator, how is maximum draft achieved?

Close the damper

Open the damper

Test outside

Cut a hole in draft

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