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Ventilation duct inspection is a specialised task that usually requires specialist equipment and experienced operators that have been trained extensively in the proper inspection methods for ventilation ducting.

Ventilation ducting can be found in use in many different industries and public sector buildings, such as the oil and gas industry, the chemical industry, schools, hospitals, libraries, museums, etc.

All of the ducting requires inspection at regular time periods to ensure efficient operation and also to ensure that good quality air is being circulated throughout the building. It should always be borne in mind that the primary function of ventilation ducting is to transport clean air to the various rooms and chambers of a building.

Poorly maintained ventilation ducting can lead to many problems. These include an increased risk of fire because of debris build up, dirty filters causing the breeding of bacteria and fungus, as well as a quality of air that is below the acceptable standard. Dust and loose corrosion parts can also reduce the efficiency of the system and can impact negatively in the longer term.

A proper ventilation duct inspection usually starts with an on-site visit to assess the situation. An alternative way is to examine accurate design drawings to assess the heating, ventilating, and air conditioning (HVAC)ducting layout. Once the initial assessment has been made, the work team can plan how to tackle the actual cleaning of the HVAC ducting.

The ventilation duct inspection is usually performed by remote camera. A mini digital camera system can be introduced into the ducting and its progress controlled remotely by an operator. The interior of the HVAC ducting can be examined in minute detail and debris and dirt can be seen, as well as corroded parts that may require attention. The journey taken by the remote camera system can be recorded as a video that can be examined at leisure later.

There are three basic methods in use for the cleaning of ventilation ducting. The contact method uses a vacuum device to clean it in a more conventional way, sucking in the debris and dust and removing it from the ducting. The air sweep method uses compressed air to dislodge built up debris and dirt. This is then swept along the ducting to be vacuumed up by a secondary system in place. The mechanical brush method uses a rubberised circular brush to dislodge debris and dirt and sweep it along the ducting where it again can be vacuumed up and removed by a secondary system.

The contact method tends to be the most effective for cleaning ventilation ducting, though the other methods work well too. The effectiveness of a cleaning operation is of course dependant to a large degree on the type of materials that the ducting is made from. The old fibreglass ducting is problematic in many respects and potentially dangerous to work with. Galvanised or zinc coated sheet steel is best as it tends to inhibit the growth of mould and mildew.

Once the HVAC ducting has been cleaned it is normal for a post-cleaning ventilation duct inspection to be undertaken. This is done to ensure that the cleaning operation is satisfactory. Again, a video recording can be taken as evidence of the successful procedure.

CCTV stands for Closed-circuit television and its use is revolutionizing law enforcement, traffic monitoring, transportation safety, private security, and that’s just the start.

CCTV is as they say, “The eye that never blinks” and records all that’s within view of its single camera or numerous cameras. The video feeds are sent to a computerized monitoring station and the content is usually recorded on digital video recorders (DVRs). There is a CCTV system to fit just about any application. Some examples would be the CCTV systems on police vehicles, traffic intersections, buses, subways, banks, the work place, casinos, and the list goes on and on.

There are those that look at this trend as an invasion of our privacy, however, it has done wonders in apprehending criminals. The digital video footage can be viewed by law enforcement and image enhancing software can then be used to pull pictures of the perpetrator or perpetrators. Rapid identification is key and the faster a criminal is identified, the quicker they’re caught. This process is much more reliable than trying to get descriptions from eye witnesses after the crime was committed.

The other benefit is the video footage of the crime can be used as evidence in a court of law. So when you consider all of these factors, a person really doesn’t have much to worry about unless they’ve been out committing crime or acts of terrorism. There have also been instances where the footage was able to prove a person’s innocence as well.

A CCTV system can be as simple or complex as you need it to be. For instance, there are units you can pick up for home use that have a few cameras and can be linked to your home computer via wireless or hardwired network cables. These types of units cost anywhere from just under a hundred dollars to thousands of dollars, you decide how complex a system you need and how much you can afford. On the high end, you can spend hundreds of thousands or possibly millions of dollars if the project and need is large enough. For example, Las Vegas has a very high concentration of these types of CCTV systems in place. So if you, your agency, your work, or your government has reason to monitor any situation – CCTV is what you need.

You may not be a qualified air conditioner technician yourself. However, some problems about central air conditioner troubleshooting can be learned by reading on the internet or just listening to how your system is operating. Therefore, it is good to be acquainted with central air conditioners. It will be enough to have some basic knowledge about air conditioner in order to understand repair manuals or your service technician.

If you want to know about central air conditioner troubleshooting, be aware of the common problems with your air conditioner unit so that you might be able to fix them yourself.

1. Problems with the condensing unit may be due to the fact that there is no power or the thermostat setting is not set low enough to have the system come on. If the breaker is not tripped and the thermostat is set to come on, but the unit fails to cool, call your service technician .
2. If cooling is not even throughout the room, obviously there is a problem with the duct work
3. If the unit does not cool sufficiently, this may be due to a dirty filter, a dirty evaporator or the blower wheel not operating.
4. If cool air is not produced, this may be because the blower motor has failed, or the blower wheel is not turning. It may also be caused by a dirty air filter restricting the air flow.
5. If the unit is turning on and off, this can be caused by dirty condensing coils which could lead to high head pressure on the compressor; or the system is low on Freon causing the compressor to short cycle.
6. If the system does not cool the rooms it should be cooling, this has certainly something to do with the duct work. In this regard, you will have to inspect the duct work for leaks.
7. If parts need replacing, call in a qualified service technician.

Dirt is the common finding of central air conditioner  troubleshooting. Therefore you should have your system cleaned regularly. Do not wait until it breaks down before doing a preventative maintenance.