When testing chimney base temperatures, in what position should the barometric damper be?

Closed

Open

If adjustments to the draft regulator during poor draft conditions requires the damper to be more then one third open, what should the technician consider doing?

Adding a second regulator

Leaving it as is

Adding a barometric damper

Removing first regulator

What directions do hot gasses have trouble moving in?

Laterally and downwards

Laterally and upwards

Upwards and downwards

What are two components of a venting system that require an OBT’s attention?

Vent / chimney and vent connectors

Vent connectors and flue gases

Heat exchanger and vent/chimney

Which venting type is more susceptible to draft fluctuations and downdrafts, thermal or mechanical?

Thermal

Mechanical

If an inducer fan is mounted at the vent termination, what kind of venting is this called?

Sidewall power venting

Sidewall manual venting

Highwall power venting

Lowwall power venting

What should venting systems that are under positive pressure be?

Gas tight

Gas loose

Air tight

Liquid tight

What pressure should the air supply be?

Local atmospheric

5" w.c.

6"w.c.

Local temp

What are the advantages of direct connection between the outside air and the burner intake?

Reduces off-cycle and outdoor air infiltration heat loss

Reduces house emissions

Maintains house pressure

What are some problems associated with soot buildup?

If you up the draft, a heat exchanger will be more or less efficient?

Less

How is the resistance to flow measured?

The draft loss across the appliance

The draft loss through the venting

The draft loss accumulated throughout the home

The draft loss through the casing of the furnace

What type of draft regulator is used on an oil-fired appliance?

Single acting

Double acting

Triple acting

All of the above

What size should a draft regulator be?

Same size as vent connector

Same size as blower motor

Same size as pipe

Same size as gas inlet

In what room should the draft regulator be installed?

Same room as burner

Same room your sleep in

Garage

Kitchen

What side should a draft regulator be installed on the venting?

On accessible side

On back end side facing wall

None of the above

What angle should the regulator tee be installed?

Right angle to the flue gas flow

Left angle to the flue gas flow

Right angle to the oil flow

Left angle to the oil flow

What type of construction must the vent connector be if a draft regulator is not installed?

Double walled connection

Insulated and sealed single-wall pipe

None of the above

Both

What should automatically operated dampers be?

Certified for their purpose

Located on the furnace

Manufactured for the home owner

Certified for their discontinuation

How often must the vent connector be supported?

Every 6'

Every 4'

Every 5'

Every 7'

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