Unit 22 - Chapter 102 Flashcards
Ventilation can be divided into two methods
Mechanical and natural
Actual ventilation rates may vary per person from
0.14 to 1.5 cubic meters per minute
Natural ventilation is improved by the used of a roof
Ventilator
Mechanical ventilation can be divided into which types?
Mechanical air intake, natural exhaust
In a mechanical air intake natural exhaust ventilation system the pressure in the building is
Slightly above atmospheric pressure
Living organisms that must be removed from the air are
Bacteria and spores
Mechanic filters can be divided into two broad classes
Throwaway and removable
Viscous filters are highly efficient in the removal of
Dust and pollen
Electrostatic filters are highly efficient in the removal of
Fine dust, smoke, and fumes
Ultraviolet light is used to remove ___ from the air
Bacteria and spores
The air velocity though a viscous filter can be ___ higher than with dry filters
2.5 m/s
The carbon in an odour absorber may be reactivated by heating it to ___ to drive out the absorbed gases
538’C
The best filters available for ventilation system lint removal are
Dry
What precaution must be taken when using ultraviolet lights to sterilize air in ventilation systems?
Position the lamps so UV rays cannot strike occupants
The activated carbon used for absorbing odours can often be reactivated by
Heating
One of the advantages of a common exhaust dust system used for ventilation in a large building is
Only one fan to maintain
Ultraviolet light is used to remove ___ from the air
Bacteria and spores
The advantage of a mechanical ventilation system is
The system supplies a controlled amount of filtered and heated air
Viscous filters are highly efficient in the removal of
Dust and pollen
Which air cleaning device can be used for the removal of gases and vapour?
Charcoal absorbers
In the past, the most popular method used to provide ventilation in a residence of a small building has been by
Natural ventilation
Activated carbon will absorb odours up to ___ of its own weight
20%
Electronic air cleaners are divided into
Electrostatic precipitators and charged media
