Industrial exhaust Flashcards
Industrial duct applications
Pollution control, general plant processes
Industrial duct extractor systems are found
Automotive ,petrol chemical pulp paper industries
Ventilation systems often require special piping considerations for what
Erosion ,abrasion and corrosion
Extraction hood types
Slot type
Find slot
Plain opening
Canopy type
CAV’s hoods can be installed without what
Bypass provision
What is acceptable range face velocity on exhaust hood?
60 feet per minute to 100 feet per minute
What’s the acceptable velocity for toxins acute material?
100 ft./min. to 125 ft./min.
Name, different types of fume hoods
Conventional fuel hood without bypass
Conventional bypassed fuel hood
Auxiliary fume hood
Vav
Components for exhaust and ventilation systems
Dilution ventilation
Local exhaust ventilation
What type of ventilation is preferred with high toxic chemicals?
Local exhaust ventilation
Two common classes of hoods are
Enclosing
Capturing
Capturing hoods need material to be what
Close to the source of the extractor
Face velocity greater than 125 feet per minute create
Turbulence
Canopy hoods are not recommended. Why
Cross draft can’t push contaminants out
Often draw air through the breathing zone of the worker
How much straight duck should there be before entering a fan?
To duct diameters
The type of air cleaner you installed depends on
Type and amount of containments
It’s concentration in the air
Factors that require special consideration
Most common type of air cleaner found in the industry is
Dust filters
Heavy material handing wheel is for
Heavy material containing small wood blocks ,paper trims are solid materials
Material handling wheels are best for
Use for heavy material, but has a back plate to prevent materials wrapping around the lights
Air handling wheels are used for
Cleaner air features backward, incline blades, most efficient wheel
Exhaust stocks, should not be located any closer the building is fresh air how many feet?
50ft
What kind of rain cap do you put on a stack?
Avoid placing on stock because of ineffective reasons tend to force contaminants back in building
When using duct hangers and supports what else should be accommodated
How did extra weight for dust?
What must be installed in duct work for safety reasons
Explosion doors
