Merv rating for hospital surgical areas?
15 to 17
Merv rating for good commercial, superior residential and general institutional
10 to 14
Merv rating for Good residential, basic commercial
5 to 9
Merv rating for basic residential furnace?
1 to 4
What is air permeability?
Uncontrolled airflow through a building’s envelope
What are the three main types of filters?
Dry, wet, and electrical
How to determine filter pressure drop?
Subtract down stream air pressure from up stream
What tool can be used to measure pressure drop in filters
Magnehelic type gauges and manometers (inches in water column)
What is the most cheap filter?
Fibrous media filter. They are washable and disposable
What does HEPA stand for?
High efficiency particulate arrestance filters
Where can you find HEPA filters?
Computer labs and medical rooms,
What’s another name for wet filters?
Air washers
Where are air washer filters normally found?
Commercial applications.
What is the atmospheric dust spot test?
The measuring of light passed through a paper covered with dust
What voltage is used by electronic air cleaners?
High DC voltage