ULV Cold Fogger Technical Evaluation Criteria for Regional Disease Control Offices and Provincial Health Offices: A Scoring Matrix That Works in Practice

When a committee must choose a ULV cold fogger from several bids, decisions based on feel or familiarity with a previous brand lead to endless debate and weak answers for auditors. This article offers a technical scoring matrix that Offices of Disease Prevention and Control (ODPC) and Provincial Public Health Offices can adapt immediately, plus a worked example of reading the published information for the electric AIROFOG U260 ULV sprayer against the criteria, using only what the supplier states.

Executive summary (1-minute read)

• The problem: evaluating several ULV mosquito sprayers often happens without shared criteria. Each committee member weighs things differently, so results are hard to explain and open to challenge.
• The fix: a scoring matrix with four groups: spraying performance, safety and site fit, quality and evidence, and after-sales service, scored by level of evidence rather than marketing language.
• The principle: anything without supporting documents scores low until documents arrive, so every cell can be audited later.
• Example machine: the AIROFOG U260, an electric ULV cold fogger from Germany with an 800 W motor, adjustable nozzle and 15 to 30 micron droplets, suited to hospitals, laboratories and high-safety sites.
• Next step: share this matrix with your committee to adjust weights to your mission, then call 065-556-6294 or LINE @whd268 for evaluation documents.

The meeting that never concluded (illustrative scenario)

Kittipong is a public health technical officer working on vector-borne disease control at a provincial health office. This year he was appointed to a committee reviewing bids for ULV sprayers to be used indoors at several service units across the province: community hospitals, office buildings and laboratories.

The bids covered several models, and every supplier wrote its documents differently. One stated a clear droplet size range; another said only "extra-fine mist"; a third attached several certificates without showing which model they covered. In the meeting, one member insisted motor power mattered most, another focused on weight, and a third had used one brand before and simply felt more comfortable with it.

The meeting ran for hours without a conclusion. Everyone was right from their own angle, but nobody had a tool to line those opinions up systematically. Finally the chair asked Kittipong to build a scoring matrix the whole committee could share, and one that could show an auditor exactly which evidence stood behind every score.

The matrix in this article is a starting point that teams like Kittipong's can use, adjusting the weights to their own mission.

Why getting the evaluation right matters

Health: Aedes mosquitoes carry dengue, chikungunya and Zika, and Anopheles mosquitoes carry malaria. Health facilities hold feverish patients, children, older people and pregnant women, all of whom need extra protection. A machine with unsuitable droplets or frequent breakdowns weakens indoor control of adult mosquitoes.

Budget: equipment bought at provincial or regional level is often distributed to many units. Choose the wrong model and the mistake multiplies across every unit that receives it, in repairs, parts and lost time.

Credibility: ODPCs and provincial health offices are technical role models for district and subdistrict units. Their selection criteria are often reused downstream. The clearer and more evidence-based the criteria, the more the office serves as a technical anchor for its network.

Audit: a decision explained only as "the committee considered it better" is weak when another bidder complains. A matrix tying every score to a document lets you answer with evidence.

Workload: with shared criteria, the committee stops re-arguing the same points each meeting, and the office can reuse the matrix in the next procurement round.

Why the usual evaluation approach falls short

• Overweighting a single number, such as wattage, when spraying effectiveness depends on droplet size, nozzle adjustment and real use together.
• Accepting claims without evidence: "fine mist" or "international standard" means nothing in an evaluation without figures or documents.
• Familiarity with a previous brand, which treats other models unfairly and can look like brand preference.
• Mixing indoor and outdoor tasks: a heat-based thermal fogging machine suits outdoor work, while indoor work, especially in health facilities, calls for a ULV cold fogger that uses no heat.
• Ignoring after-sales service: a machine that looks good on paper but lacks parts or technicians stops working on the day it is needed most.
• No live test: deciding from documents alone without seeing operation, nozzle adjustment and ease of use.

Key terms in one line each

• ULV (Ultra Low Volume): spraying a very small volume of chemical as fine droplets that stay airborne to contact mosquitoes.
• Micron: a unit of droplet size; one micron is one thousandth of a millimetre.
• Thermal fogger: a machine that uses heat to create a visible fog, suited to outdoor work.
• Evidence level: how reliable a bidder's information is, from nothing at all to full documents confirmed by a live demonstration.

Step 1: An evidence-based scoring scale (0 to 4)

The core idea is that every criterion uses the same scale and is scored on both strength of evidence and fit to the task. This stops a well-written bid with no documents from gaining an advantage.

The weighted score for each criterion is simply (score divided by 4) multiplied by that criterion's weight. Add all criteria for a total out of 100.

A quick example of the arithmetic: if a bid scores 3 on a criterion weighted 12, it earns three quarters of 12, which is 9 points. If it scores 2 on a criterion weighted 8, it earns half of 8, which is 4 points. Because the calculation is so simple, any committee member can check it by hand, and the evaluation file does not depend on a spreadsheet that only one person understands. The same scale also makes it easy to see where a bid can improve its score, since the answer is almost always "provide the document" or "show us in a demonstration", which keeps the process transparent for every bidder.

Step 2: Criteria and example weights (adjust to your mission)

These weights are an example for indoor spraying in health facilities and government buildings. They are not an official standard. The committee should adjust them to its mission and fix them before any bid is opened.

Important: this is a technical evaluation tool. Using scores within procurement, for example combined with price, must follow the criteria and methods in the regulations currently in force, and the criteria must be announced in advance through the proper process.

Step 3: Reading the AIROFOG U260 against the criteria

This section shows how to use the matrix by matching the supplier's published information on the AIROFOG U260 ULV cold fogger to each criterion. Actual scores must be given by the committee after checking documents and watching a demonstration; this article does not assign them.

The published information addresses several criteria in groups A, B and C. For items the summary does not cover, such as chemical formulations, weight and tank capacity, the committee should request documents before scoring. Apply exactly the same approach to every bid, for fairness.

Step 4: Summarise results and write an auditable report

Show group subtotals before the total. Four separate subtotals reveal where each bid is strong or weak; one may perform well but have weak after-sales support, a long-term risk for the network.

Set minimum scores per group. Beyond the total, the committee can agree in advance that certain groups must reach a threshold, preventing a high total from hiding a serious weakness such as no local technicians.

Attach evidence for every 3 or 4. These scores claim full documents or a demonstration. If no evidence is attached, lower the score according to the scale.

Record disagreements. Where members scored very differently, note each side's reasoning and the agreed outcome. This is valuable when questions come later.

Keep the matrix for next time. After a period of real use, let the health team review which criteria deserve more or less weight, so the matrix improves and becomes a shared tool for the network.

Common mistakes

• Changing weights after seeing the bids.
• Giving a 4 without a live demonstration because documents look complete.
• Using one matrix for indoor units and vehicle-mounted units.
• Not checking that certificates match the exact model offered.

Adapting the weights to different missions

The example weights assume indoor spraying in health facilities. Offices with other priorities can shift weight between groups while keeping the total at 100. The guidance below is qualitative on purpose; the committee decides the exact figures and records its reasons before bids are opened.

Whatever profile you choose, keep the same 0 to 4 evidence scale. Changing weights changes priorities; changing the scale would change the meaning of every score and make comparisons across procurement rounds unreliable. A stable scale is what allows provincial offices to share results with ODPCs and with each other, building a body of evidence about which government mosquito control equipment performs well in real Thai conditions over time.

It also helps to document why a profile was chosen. A short paragraph in the evaluation file, noting the sites the machines will serve and the vulnerable groups present, lets reviewers understand the weights without needing to attend the meeting.

The solution: why the AIROFOG U260 deserves a place in your evaluation

The AIROFOG U260 is an electric ULV cold fogger from Germany with an 800 W motor, an adjustable nozzle and droplets in the 15 to 30 micron range. The supplier states it is suited to hospitals, laboratories and high-safety sites, which matches the work of ODPCs and provincial health offices responsible for health service buildings, offices and laboratories in their networks.

Its key technical strengths are that it is electric and uses no heat, making it more suitable indoors than a thermal fogger, and that its droplet range is stated numerically, so criterion A1 can be scored from documents rather than description. Combined with World Health Disinfection (WHD)'s ISO and GMP systems, 100% quality control before delivery, after-sales service, technicians, spare parts and documentation aligned with Thai government equipment standards, the bid has evidence behind many criteria in the matrix.

For outdoor or wide-area work, evaluate other machine types separately, such as the AIROFOG AT35 thermal fogging machine or the GREENFOG F4 vehicle-mounted sprayer, with weights adjusted for that work.

What leaders gain

• Network confidence: clear criteria that district and subdistrict units can reuse.
• Fewer complaints: every bidder sees it was judged by the same rules.
• Visible results: the score sheet and evidence file demonstrate systematic work.
• Budget used wisely: a machine that fits indoor work, with after-sales support.
• An audit-ready purchase: every score traces back to a document or demonstration.

For the public health team: running a live spraying test

• Choose a sample room similar to real sites, such as a waiting area or meeting room, and close doors and windows following safety procedures.
• Have each bidder prepare the machine, adjust the nozzle and spray using the same steps, with water or a demonstration-safe liquid.
• Observe droplet consistency, response to nozzle adjustment, noise, body temperature and ease of handling.
• Have at least two members record results independently, then agree a joint result to reduce personal bias.
• Photograph or film the demonstration for the evaluation file.
• State in the report that spraying supports vector control and must be combined with Aedes breeding-site removal under the Department of Disease Control's "3 Keep, Prevent 3 Diseases" measures, with spraying timed to mosquito activity.

10 reasons to use this matrix and include the U260 in your evaluation

1. Ends circular debate: everyone uses one scale and one set of weights.
2. Scores follow evidence: well-documented bids gain a fair advantage.
3. Separates indoor from outdoor work, so a thermal fogger is never compared with a ULV sprayer by mistake.
4. The U260 states droplet size numerically, 15 to 30 microns, so A1 can be scored from documents.
5. The U260 nozzle is adjustable, which the committee can see live under A2.
6. Electric with no heat, consistent with indoor safety criteria.
7. Stated for hospitals and laboratories, matching the mission of public health networks.
8. A supplier with quality systems: ISO and GMP, with every unit inspected before delivery.
9. Technicians and spare parts give the after-sales group real evidence.
10. Room to grow: add other machine types from the WHD government equipment hub for wider insect control.

Before and after: evaluating with a shared matrix

Procurement tips when using a scoring matrix

Fix criteria before seeing bids. Record weights and the scale before bids are opened, to avoid any suspicion of tailoring criteria to one bidder.

Align specifications with the criteria. If droplet size matters, require bidders to state a numeric range with documents, without fixing figures that match only one brand.

List required documents clearly: product literature, certificate copies, warranty letter, training plan and a sample Thai manual, so every bid arrives in comparable form.

Budget for the whole cycle: chemicals, protective equipment and maintenance, in line with how network units will use the machines.

Check current regulations. Ask procurement staff to confirm that using scores in the decision follows the criteria in force on the day.

Example field perspective

"Before the matrix, we argued about which model was better based on personal experience. Once we scored by evidence level, agreement came much faster. A bid with a numeric droplet range, documents and a live nozzle demonstration scored accordingly; a bid with only descriptions was asked for documents before scoring. We can now explain every line to management and auditors."

Note: a composite example based on typical technical committee work, not a quote from any specific person or agency.

Frequently asked questions

Q: Are these weights an official government standard?
A: No. They are an example for indoor spraying. Committees should adjust them to their mission and fix them in advance.

Q: What if a bidder does not state droplet size?
A: Score according to the evidence available, 0 or 1. If rules allow further document requests, make the same request of every bidder.

Q: Can this matrix evaluate thermal foggers?
A: The structure works, but adjust criteria and weights, for example adding heat resistance of materials and outdoor use.

Q: Where does the U260 information come from?
A: From the supplier's published information: German origin, electric ULV, 800 W motor, adjustable nozzle and 15 to 30 micron droplets. Request other details directly from the supplier.

Q: Can we request a U260 demonstration?
A: Contact 065-556-6294 or LINE @whd268 to arrange one.

Q: Does a ULV sprayer treat dengue?
A: No. It reduces adult mosquitoes and transmission risk only; prevention needs several measures together.

3 next steps

1. Call or LINE for a quotation and specifications: 065-556-6294 or LINE @whd268, requesting U260 documents matching the "evidence requested" column.
2. Request a demonstration or training: run a live spraying test before the committee.
3. Budget and procure according to regulations, using the matrix as part of your documented evaluation.

Evaluate on evidence, then choose the ULV cold fogger that fits the job

Request documents, specifications and a demonstration of the AIROFOG U260 for public health use.

Call 065-556-6294 · LINE @whd268

Related links

• WHD government mosquito and insect control equipment hub
• AIROFOG U240 ULV sprayer
• MASTER ELECTRIC ULV fogger
• Department of Disease Control, Ministry of Public Health
• WHO: Vector-borne diseases

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