HVAC Ventilation & Air Filters EXAM
QUESTIONS WITH CORRECT
SOLUTIONS||100% GUARANTEED
PASS||UPDATED 2026/2027
SYLLABUS||A+ GRADED||<<NEWEST
VERSION>>
What factors determine what type of air cleaner should be used in an air
conditioning system? - ANSWER ✓ -type and concentration of contaminants
-degree of cleanliness desired
Classifications of air cleaning devices? - ANSWER ✓ -mechanical air filters
-electronic air cleaners
-air washers
-charcoal absorbers
-activated alumina chemisorbant media
-ultraviolet or germicidal lamps
Two broad classes of mechanical filters? - ANSWER ✓ -throwaway
-cleanable or renewable
Dry filters:
Advantages?
Disadvantages?
Air speed through?
Corrugated, why? - ANSWER ✓ -efficient at removing dust
--best at removing lint
-low dust-holding capacity
, --ineffective at removing fine particles
-0.25m/s
-to expose as large of a surface area as possible
How is the operating period of a curtain filter controlled? - ANSWER ✓ -
adjustable time clock
-pressurestat (pressure drop increases when filter is dirty)
Two types of dry filters boast a high dust removal efficiency and low air
resistance?
What are three other characteristics of these filters?
What is the filter medium for both of these filters? - ANSWER ✓ -replaceable bag
and replaceable wedge type filters
-very large filtering area
--large dirt holding capacity
--longer life than pad type
-modacrylic fibre
Why would you put a pad type filter ahead of a bag or multiwedge filter? -
ANSWER ✓ -to increase the life of the more expensive filter
What is the most common type of filter used in ordinary air conditioning systems?
- ANSWER ✓ -viscous impingement type
In most designs of viscous impingement filters, why is the filtering material
packed tighter in the direction of airflow? - ANSWER ✓ -so air passages get
progressively smaller
Common air velocity through viscous impingement filters?
Common thickness of cardboard frame for throwaway viscous impingement
filters?
QUESTIONS WITH CORRECT
SOLUTIONS||100% GUARANTEED
PASS||UPDATED 2026/2027
SYLLABUS||A+ GRADED||<<NEWEST
VERSION>>
What factors determine what type of air cleaner should be used in an air
conditioning system? - ANSWER ✓ -type and concentration of contaminants
-degree of cleanliness desired
Classifications of air cleaning devices? - ANSWER ✓ -mechanical air filters
-electronic air cleaners
-air washers
-charcoal absorbers
-activated alumina chemisorbant media
-ultraviolet or germicidal lamps
Two broad classes of mechanical filters? - ANSWER ✓ -throwaway
-cleanable or renewable
Dry filters:
Advantages?
Disadvantages?
Air speed through?
Corrugated, why? - ANSWER ✓ -efficient at removing dust
--best at removing lint
-low dust-holding capacity
, --ineffective at removing fine particles
-0.25m/s
-to expose as large of a surface area as possible
How is the operating period of a curtain filter controlled? - ANSWER ✓ -
adjustable time clock
-pressurestat (pressure drop increases when filter is dirty)
Two types of dry filters boast a high dust removal efficiency and low air
resistance?
What are three other characteristics of these filters?
What is the filter medium for both of these filters? - ANSWER ✓ -replaceable bag
and replaceable wedge type filters
-very large filtering area
--large dirt holding capacity
--longer life than pad type
-modacrylic fibre
Why would you put a pad type filter ahead of a bag or multiwedge filter? -
ANSWER ✓ -to increase the life of the more expensive filter
What is the most common type of filter used in ordinary air conditioning systems?
- ANSWER ✓ -viscous impingement type
In most designs of viscous impingement filters, why is the filtering material
packed tighter in the direction of airflow? - ANSWER ✓ -so air passages get
progressively smaller
Common air velocity through viscous impingement filters?
Common thickness of cardboard frame for throwaway viscous impingement
filters?
