The occasional

The occasional cleaning of HVAC frameworks may be important to guarantee conveyance of satisfactory air to the indoor environment. Cleaning may be needed on more seasoned frameworks that have not been appropriately kept up, harmed frameworks, or in unique cases, for example, after far reaching indoor or outside development exercises. HVAC framework cleaning is costly and conceivably problematic to ordinary operations so all conceivable wellsprings of IAQ issues ought to be examined and rectified preceding deciding the requirement for framework cleaning. Successive cleaning of HVAC frameworks ought not be obliged if the framework is legitimately kept up as illustrated in Chapter 3 of this archive.

2.02 HVAC SYSTEM INSPECTION AND SITE PREPARATIONS

2.02 HVAC SYSTEM INSPECTION AND SITE PREPARATIONS
(A) HVAC System Component Inspections
Prior to the commencement of any cleaning work, the HVAC system cleaning contractor shall
perform a visual inspection of the HVAC system to determine appropriate methods, tools, and
equipment required to satisfactorily complete this project. The cleanliness inspection should
include air handling units and representative areas of the HVAC system components and
ductwork. In HVAC systems that include multiple air handling units, a representative sample of
the units should be inspected.
(B) The cleanliness inspection shall be conducted without negatively impacting the indoor
environment through excessive disruption of settled dust, microbial amplification or other debris.
In cases where contamination is suspected, and/or in sensitive environments where even small
amounts of contaminant may be of concern, environmental engineering control measures should
be implemented
1. Damaged system components found during the inspection shall be documented
and brought to the attention of the owner.

1 SCOPE OF WORK

1 SCOPE OF WORK
(A) The scope of work for this project will include cleaning of all HVAC ductwork and accessories
at the Putnam Elementary School, Middle School and High School. The extent of ductwork to be
cleaned shall be determined by review of available construction documents and field verification.
(B) The Contractor shall be responsible for the removal of visible surface contaminants and
deposits from within the HVAC system in strict accordance with these specifications.
(C) The HVAC system includes any interior surface of the facility’s air distribution system for
conditioned spaces and/or occupied zones. This includes all Heating, Ventilating and Air
Conditioning systems from the points where the air enters the system to the points where the air is
discharged from the system. The return air grilles, return air ducts to the air handling unit (AHU),
interior surfaces of the AHU, mixing box, coil compartment, condensate drain pans, supply air
ducts, fans, fan housing, fan blades, turning vanes, filters, filter housings, reheat coils, and supply
diffusers are all considered part of the HVAC system. The HVAC system may also include other
components such as dedicated exhaust and ventilation components and make-up air systems.
The Kitchen Hood Exhaust systems are not included in the scope of wor

Assess the need for interlocking the ventilation power

Assess the need for interlocking the ventilation power
supply to the gas supply and take appropriate action.
This decision should be based on a competent
persons’ assessment of the risks associated with the
use of the gas appliance.
Further guidance for designers is available from
industry produced technical guidance, for example
guidance from The Chartered Institution of Building
Services Engineers (CIBSE) and The Heating and
Ventilation Contractors’ Association (HVCA) (see
‘Further information’).
The equipment installer
The equipment should be installed by a competent
person. The equipment installer needs to know the
design performance and capacity of the ventilation
system, so they can ensure adequate ventilation.
For existing installations where data is absent or
unavailable, the installer should recommission the
system of extraction and make-up air, and produce a
report detailing its performance. A competent heating
and ventilation specialist can provide this information.
Gas-fired appliances should be installed by a Gas
Safe engineer.

The presence of gas appliances subject to the

The presence of gas appliances subject to the
Gas Safety (Installation and Use) Regulations
1998. In particular, the requirement for an
adequate supply of air for combustion and flueing
arrangements.
■ kitchen usage information from the caterer;
■ equipment information from the caterer or
supplier, eg cleaning requirements, the amount
of air required for complete combustion, and the
performance of the existing installation;
■ the requirements or specifications for the air
cleaning system, eg for grease removal at the
canopy and also before final discharge outside;
■ the limitations of the building, eg the available
room may influence the sites and routes for air
inlets or discharges;
■ food hygiene requirements, eg identify a suitable
source for clean make-up air; prevent pest entry;
avoid grease accumulation and ensure easy
cleaning of the system;

The building owner or manager

The building owner or manager
The owner or manager of the building may provide
facilities such as equipment and ventilation. In these
cases, they should follow the advice here. Providing
adequate ventilation will require the owner to obtain
information on probable kitchen usage from the caterer.
The designer/design team
The ‘design team’ means the various interested parties
(owner, caterer, designer, supplier and installer). They
need to discuss their respective information needs and
what information each should supply

New ventilation systems

New ventilation systems
The caterer
The caterer will need to provide detailed information
for the competent advisor, designer and installer,
including the following information:
■ maximum demands likely to be placed on the
ventilation (eg to cope with peaks of activity);
■ amount and type of kitchen equipment;
■ the menu;
■ number of meals; and
■ number of staff.
Advisors, suppliers and installers should be
competent and have knowledge of industry practice
and relevant health and safety guidance and
legislation.
The caterer should consult with the safety or
employee representatives in good time about any
significant changes.
The caterer should keep records of design
criteria, commissioning performance, maintenance
requirements, and of tests and inspections. These
enable maintenance, modification, and testing against
the original specification.

Discharge

Discharge
High-level discharge of extracted air is often needed to
prevent nuisance to neighbouring properties. Avoid rain
caps and other devices that impede upward vertical
velocity. Never use devices that direct the discharge
downward as they encourage down draught and
re-entry of fumes into the building. Fume discharge
should also be away from wet cooling towers.

Airtherm

Airtherm have a large range of both metal and uPvc dampers in circular, square and rectangular shapes with sizes from 300mm to 1800mm.
Volume control dampers need not be overly complicated. The only requirements are that they should have a low leakage when closed, not create too much resistance when open and should be easy to operate.
Series VCD Volume Control Dampers satisfy all of these requirements - the 75mm blade pitch with a blade less than 1cm thick at it's widest point, results in very little resistance when open, while the standard blade is shaped perfectly to reduce leakage when close

How long has the

1. Can the company show proof of NADCA membership and certification? 
2. How long has the contractor been in the residential HVAC system cleaning business? 
3. Can the contractor provide you with evidence of the current Worker’s Compensation and General Liability Insurance 
4. coverage? (Ask for Certificate of Insurance) 
5. Does the contractor posses the proper Licenses that are required by your city or state to perform the work they are 
6. proposing? (Not all cities or states require licenses - click here to check your state.) 
7. Can the contractor provide you with 3 to 5 customer references with phone numbers for projects of similar size and scope 
8. of work which they provided service in the last year? 
9. Does the contractor have written safety, respiratory, and confined space programs in addition to OSHA compliance 
10. reports? 
11. Will the contractor provide you with a means to conduct a visual inspection at any time during the cleaning? (Mirror and 
12. flashlight, camera or other remote visual systems) 
13. Will the contracting company actually do the work? (Some companies subcontract the work to independent contractors. 
14. You will want to apply these guidelines for subcontractors as well.) 
15. Will the company be assigning an Air Systems Cleaning Specialist (ASCS) to your project that will be responsible for the 
16. complete project? 
17. If there is any remediation of mold or other biological contamination does the company have a Ventilation System Mold 

UV Filtration

UV Filtration A UV filtration system can reduce grease build-up and common odours by using UV light to break down organic material that can plague kitchen canopies.
UV filtration reduces the need for duct work cleaning and can prove more efficient than conventional filtration methods.
The UV Filtration works by using UVC lamps to break down organic material by a combination of photolysis and ozonolysis and destroys odours more efficiently and cost effectively than conventional systems.

Unvented hotness

Unvented hotness in the mid year disintegrates material materials and brings down vitality proficiency.

Amid hot climate, legitimate ventilation can ensure top shingles, make your home feel cooler, and diminish cooling expenses. See figure 1.

In hot climate, temperatures inside a shamefully vented upper room can move to in excess of 150 degrees Fahrenheit, making it feel like a sauna.

These high storage room temperatures can prompt quickened shingle contortion and weakening.

Canopy Lighting

Canopy Lighting The lighting units are designed and manufactured to deal with wide ranging and varied commercial applications and can deal with humidity, condense rich, and hot and greasy environments.  
These units are normally recessed into the canopy ceiling providing easy cleaning and maintenance of the unit exterior. This also helps to greatly reduce the build-up of grease and other contaminates usually associated with the commercial kitchen environment.
All of our lighting units are approved for use in commercial kitchen applications, meet with DW172 & HSE guidelines.
Face plates are satin finished, stainless steel to match the hood interior

Maintenance & Contract

Maintenance  & Contracts In our pursuit of customer satisfaction we have now introduced our tailored service contracts which offer complete peace of mind, covering unexpected costs from system isolation and dissatisfied customers of your own.
All of our maintenance contracts are made to meet the demands set by the client and the specific requirements dictated by the unique design and layout of the ventilation system. Our engineers will visit the client’s premises at regular planned intervals to carry out agreed works and report to the client ensuring the system remains efficient and reliable when they need it most.  
It is crucial to regularly service your ventilation system not only to maintain correct function and avoid lost revenue from unplanned closure of your premises but also to minimise the risk of fire and other health and safety factors.
By entering into a maintenance agreement with us, you are fulfilling your obligation ensuring procedures are in place for regular checks.
Design

Installation

Installation   Our installation engineers are competent in their field. The all carry the necessary site certification with CSCS cards and hold the relevant safety accreditations. Our engineers strive towards excellence in each and every project they undertake and are carefully vetted to ensure that they are fully trained and have adequate experience in their field of operation.
Airtherm strive to keep up with the changing demands of the industry in order to maintain our proud position as a market leader. From design to installation, after sales to maintenance, Airtherm Engineering Ltd have an ongoing commitment to provide the best available service for the customer.
By managing projects closely, adhering to strict safety guidelines and demanding the highest quality workmanship, we continue to build our reputation for completing projects on time and within budget using the most efficient solutions
We hold CHAS, Construction Online & Safe Contractor accreditations to satisfy clients of our commitment to Health & Safet

System calculations

System calculations are quickly available by entering the appliance details and the intended kitchen canopy configuration and dimensions into our iCalc sizing system.
We work closely with local authorities, M&E Engineers and main contractors to ensure full compliance to current legislation.
Airtherm’s design department, contract engineers and site installation teams have a wide range of knowledge and experience.
Projects are carried out to ensure full compliance with all statutory requirements and standards.
Whatever the requirements of your project, we guarantee a solution of the highest quality, that has been rigorously tested and offers outstanding performance in its field.
AutoCAD drawings are produced by our highly experience team of engineers for approval

All filters are manufacture

All filters are manufacture from stainless steel and provided with grips for easy removal and installation.
Baffle grease filters collect grease and stop flames from penetrating into the hood exhaust ductwork.
They are designed to prevent flames from passing through the baffles and can withstand various temperature levels. The solid baffle construction of each hood filter ensures a reliable flame barrier when you need it.
Practising efficient grease removal lowers the risk of incidents such as flare-up

These high attic temperatures

These high attic temperatures can lead to accelerated shingle distortion and deterioration.

These high attic temperatures also can lead to higher energy consumption: Typically, on a hot day, the upper rooms of a home are warmer because warm (lighter) air rises while cooler (denser) air falls. However, when improper attic ventilation allows the attic to become super-heated, the phenomenon of downward heat migration occurs (through the attic floor and into the home’s upper floors). This makes the upper floors of the home even warmer. The extra heating of the upper floors is not usually alleviated by the night time; an inadequately ventilated attic seldom loses enough heat overnight to compensate for the heat gained during the day. This effect is magnified in modern homes with heavier insulation that prevents heat from escaping from the upper floors. The extra heating of the upper floors due to the downward migration of heat causes homeowners to run mechanical equipment, such as air conditioners and window fans, longer than they otherwise would in order to cool down the home. In this way, inadequately ventilated attics contribute to greater energy consumption in higher utility bills during the summer.

Unvented heat

Unvented heat in the summer deteriorates roofing materials and lowers energy efficiency.

During hot weather, proper ventilation can protect roof shingles, make your home feel cooler, and reduce air conditioning costs. See figure 1.

In hot weather, temperatures inside an improperly vented attic can climb to over 150 degrees Fahrenheit, making it feel like a sauna.

Trickling dampnes

Trickling dampness additionally can infiltrate into the upper room floor and, in the long run, into the roof underneath. On the off chance that this happens, the top-floor roofs may display water stains and paint harm. At the point when this sort of harm is unmistakable, that is a decent risk that the surrounding material behind the sheetrock has additionally been harmed by dampnes

lot of water

In the event that a lot of water douses into the protection, it can get to be packed and lose its protecting force. We have even seen ice gems that framed all through fiberglass protection. At the point when the protection is in this condition, it loses some of its protecting force. This prompts more prominent high temperature misfortune, colder rooms, a more noteworthy request on the heater, and to higher service bills.

Ice gathering on the underside of a top.

Ice gathering on the underside of a top.

Ice gathering on the underside of a top.

This dampness reasons harm in two ways. First and foremost, dampness consolidating on the top's structural incorporating parts will splash with the wood. This can prompt wood decay and the crumbling of material materials. Second, dampness in the end will trickle onto the building parts underneath.

Issues emerge

Issues emerge amid cool temperatures when warm, soggy air from the home achieves the storage room, is not vented to the outside, and it waits in the cooler and drier loft. As the dew point is arrived at, water vapor held in the hotter air gathers on cool upper room surfaces — building parts, for example, rafters, trusses, and top sheathing. See figure 2. In the winter, amid low temperatures, the dense dampness can show up as ice.

Particle Pollution

Particle Pollution

Particle pollution, also known as particulate matter (PM), includes the very fine dust, soot, smoke, and droplets that are formed from chemical reactions, and produced when fuels such as coal, wood, or oil are burned. For example, sulfur dioxide and nitrogen oxide gases from motor vehicles, electric power generation, and industrial facilities react with sunlight and water vapor to form particles. Particles may also come from fireplaces, wood stoves, unpaved roads, crushing and grinding operations, and may be blown into the air by the wind.

these pollutants

EPA calls these pollutants "criteria" air pollutants because it regulates them by developing human healthbased and/or environmentally-based criteria (sciencebased guidelines) for setting permissible levels. The set of limits based on human health is called primary standards. Another set of limits intended to prevent environmental and property damage is called secondary standards. A geographic area with air quality that is cleaner than the primary standard is called an "attainment" area; areas that do not meet the primary standard are called "nonattainment" areas.

Six common air pollutant

Six common air pollutants (also known as "criteria pollutants") are found all over the United States. They are particle pollution (often referred to as particulate matter), ground-level ozone, carbon monoxide, sulfur oxides, nitrogen oxides, and lead. These pollutants can harm your health and the environment, and cause property damage. Of the six pollutants, particle pollution and ground-level ozone are the most widespread health threats. Details about these two pollutants are discussed below. For information about the other common pollutants, visit EPA's website at

Improving Indoor Air Quality Really Works

Improving Indoor Air Quality Really Works

“The good news is that this stuff is proven to work,” Schachter says. “By increasing ventilation and avoiding use of irritating substances, you will lower levels of known irritants. Some symptoms such as headache and sore throat will go away quickly, while others -- such as asthma-like wheezing -- can take a while to disappear as the airways become less reactive.” 

Secondhand Smoke

Secondhand Smoke

Secondhand smoke from tobacco is a huge indoor air offender, experts say. “In terms of irritants, tobacco smoke is a threat to everyone,” Nelson says. “Passive smoke is a risk factor for asthma in children and increases the possibility of a non-smoker developing lung cancer or chronic obstructive pulmonary disease." This long-term lung disease, also called COPD, includes both chronic bronchitis and emphysema.

The solution is simple: Just say no to smoking in your home. If guests must smoke, ask them to go outside.

Better Air Quality Indoors: Evicting Dust Mites continued.

Better Air Quality Indoors: Evicting Dust Mites continued...

Air conditioning can keep humidity down and reduce dust mite allergens tenfold.  If you don’t have air conditioning, try a dehumidifier.  You can measure humidity with a hygrometer, available at hardware stores.

Impermeable covers on mattresses and pillows can also help keep these unwanted guests off your bedding. Wash bedding (and washable stuffed toys) once a week in hot water and dry them thoroughly.

Reduce dust by dusting often with a damp (not dry) cloth or dust mop.  Vacuum upholstered furniture, drapes, and rugs thoroughly once a week, preferably with a vacuum with a HEPA filter.

Better yet, remove wall-to-wall carpeting and large area rugs, especially in the bedroom. “These can be havens for dust mites,” Calhoun says. “We don’t like to get out of bed and have our feet hit a hard wood floor, but a smooth, hard surface is best if you are sensitive to dust mites.”

Better Air Quality Indoors: Evicting Dust Mites

Better Air Quality Indoors: Evicting Dust Mites

There are the pets we love and invite into our homes and beds, and then there are those uninvited guests like house dust mites.

These creepy, crawly microscopic critters are the most common cause of allergies from house dust. They can be found where you sleep (your pillows and mattresses), where you relax (upholstered furniture), and where you walk (your carpeting). What’s more, they float into the air when you vacuum, walk on a carpet, or ruffle your bedding.

What can you do? Plenty!

Dust mites love humid air, so keep house humidity below 30 or 35 percent. “House dust mites don’t tolerate dryness well, so you don’t want to run a humidifier in the bedroom to encourage their growth if you are allergic,” Nelson says.

Background air leakage

Background air leakage

Some features will provide low-level background movement of air between your home's interior and exterior. This is often called air infiltration, and can cause draughts and heat loss in winter. For example:

• timber joinery around windows and doors
• flues and chimneys
• recessed ceiling and light fittings
• extractor fan grills.

It is better to plan good ventilation together with a well-insulated house, than rely on leaks and draughts which you cannot control when you need to and won’t necessarily ventilate the right places.

Active ventilation

Options

Options

The appropriate ventilation options for your home will depend on the climate and microclimate of the area you live in, and what prevailing breezes there are. As a rule of thumb, the area of windows, doors and other vents that can be opened up to the outside should be at least 5% of the floor area for each living space - and more for high-use areas.

Some points to consider:

• Windows or other openings on opposite sides of your home will help draw air through.
• Opening windows on the south and east side are best for allowing cool breeze into your home from early in the day. Openings on the north and west sides, higher up, will keep the air moving.
• Vents or other openings in the roof or on upper floors will allow air to escape as heat rises.
• Built-in vents, louvres, slots and gaps in door or window framing can provide low-level ventilation over long periods without creating draughts or security risks.
• Different types of window can be used to guide air into your home - for example, side opening windows are better at catching breezes and pulling them into the house, than awning opening windows
• If your home is on more than one level, make sure there are opening windows and doors on each level. As hot air rises, high windows which can be left open on upper floors can be a good way of ventilating your house during summer.
• Fly screens and security stays installed on windows mean they can be left open at night, or when you’re out during the day, to help the house keep cool in summer
• Don’t forget to ensure cross-ventilation under your floor to get rid of dampness (seeMoisture for more information)