Remember:

Remember: ¾ Duct cleaning should only be undertaken as a last resort, after other measures have been exhausted. ¾ Duct cleaning should only be done after the problem has been thoroughly evaluated and the contaminant source has been identified and controlled. DOHS staff are available to help study the problem and find solutions. ¾ Prevent dirt, water, and other contaminants from entering ducts in the first place, by following good practic

While filters

While filters are draining operatives to dismantle the sprayer and all other equipment ensuring that the cleaning and spray tanks are emptied and waste solution is disposed of safely on site.
13  Once filters are dry, operatives to carry out a visual and manual quality inspection to ensure that all grease and other debris have been successfully removed from filters.
14  Operatives are to replace the cleaned filters carefully back into the canopy.
15  On completion of cleaning, operatives to dispose of all waste chemicals and materials on site and remove all cleaning equipment, chemicals and signage to company vehicle.
16  Operatives are not to leave the site until authorised by Supervisor.

Operatives to ensure

Operatives to ensure that the client has had all appliances turned off, pilot lights extinguished, gas valves closed and controls isolated. Cover all kitchen equipment to avoid damage and soilage, using sheeting and boards where necessary.
Stainless steel ceilings
3  Operatives to erect access equipment e.g.. stepladder or ladder in the correct and safe manner. Ladders to be erected at the correct angle of 1:4 (75º). If working between 2-6 metres height ladders must be footed or an approved ladder stopper or stabiliser used.
4  Operatives to wash panels using either a ‘Greenie’ or cloth as necessary.
5  Operatives to then wash off all residue chemical using clean water and clean cloths.
6  When panels have dried, operatives to polish them with kitchen paper and stainless steel polish if required.
Painted – false or clipped tile ceilings
General Note: Ceilings can be emulsion or gloss painted, or have PVC coated tiles suspended as a false ceiling, therefore do not use too much pressure when cleaning as this may damage t

Duct Contamination

Duct Contamination Control Consider dealing with both moisture and soils that might enter the ductwork because both are involved with the problem of air duct contamination and the resulting indoor air quality problem. Soil Build-up in Air Conditioner Ducts • Effective filtering is essential for keeping air handling ducts clean. New filter types now available can remove more and smaller particles. In homes with pets and/or activities that produce particles, traditional fiberglass filters may not provide the protection needed. • Dirt build-up can be controlled by regularly inspecting and changing air conditioning filters. The build-up of dust on air conditioning filters causes air to by-pass the filter and carry organic dirt and spores into the ducts. • Air conditioner ductwork must be kept in good repair. Leaks around duct joints in attics can introduce dust and spores

TESTING PROCEDURE

TESTING PROCEDURE What should you expect when a contractor performs a duct test at your home or business? The test should take about an hour from initial setup to completion. You may be present while the test is being conducted, although the heating and air conditioning system must be shut off during testing. A properly conducted test will not damage your heating or air conditioning system or your building. The contractor will have to attach the duct tester to the blower compartment of the air handler or the main return grill using masking tape. Next the supply registers and any remaining return grills must be taped closed. After the duct system is temporarily sealed, the duct tester fan will be turned on to pressurize the duct system to a predetermined level (usually 25 Pascals, which is 0.1 inches of water column), and the contractor will adjust the gauges until the pressure level is stabilized. The contractor then records the fan pressure and converts this to a fan flow in cubic feet per minute. The results will show how leaky your duct system is and help you and your contractor decide whether sealing or repair work is necessary

The new facility

The new facility
The main specifications of the project were: •very low background noise, no vibration transmission; • double acoustic insulation of the reverberation rooms; • ideal proportions for the reverberant rooms, possibly in a new building; •a minimum of parallel surfaces in the reverberation rooms; • twin reverberation rooms to measure indoor and outdoor sides simultaneously; •two additional rooms to install the units and measure in-duct sound; • good control of the test conditions (temperatures, humidity and flows).
Additionally, the laboratory was also meant to allow determination of the coefficient of sound absorption of materials in accordance with EN 20354:1993 “Acoustics. Measurement of the sound absorption in a reverberant room (ISO 354:1985)”.

Bedrock-source

Bedrock-source systems are mainly applied in the Nordic countries and Switzerland. Typical drilling depths are 70-200 m with diameters of 125 mm. For a house, one hole is usually sufficient. Boreholes are not filled with grouting material. They are filled with groundwater for good thermal coupling, also under freezing conditions. Grouting is applied in other regions of Europe, notably Switzerland and Austria, and in areas with unstable bedrock. In the Nordic countries usually two loops (40 mm) are inserted in each borehole; elsewhere 4 loops are sometimes applied (32 mm).
New houses can benefit from so-called ‘free cooling’, if a ground-coupled heat pump is applied. During the summer, cold brine is simply pumped to the house without operating the heat pump. The heated water is recharging the heat pump’s heat source. This concept has become popular in some countries, stimulating the use of heat pumps.