Termonebulization method

Thermal fogging is an advanced technique that uses heat to convert a pest control solution into a dense fog of microparticles. This fog behaves almost like a gas: it stays suspended and penetrates hard-to-reach areas such as ventilation ducts, false ceilings, spaces behind machinery, and structural cracks, reaching corners that a liquid spray could not cover.

How it works

A thermal fogger heats the pest control solution to a high temperature and expels it as a dense smoke made up of extremely fine particles, between 0.5 and 50 microns. Because of their tiny diameter, these microparticles stay suspended in the air for an extended period and distribute evenly throughout the entire volume of the treated area before settling onto surfaces.

The procedure follows three phases:

• Temporary sealing: the space is closed so the fog concentrates and does not dissipate before acting.
• Application and dwell time: the fog is generated and left to act long enough to penetrate voids, ducts, and ceilings.
• Subsequent ventilation: once finished, the area is ventilated for the indicated time before re-entry is authorized.

When it's used

Thermal fogging is particularly effective in large spaces and for controlling flying insects such as mosquitoes and flies, which remain airborne or settle in high areas. It is ideal for:

• Industrial and logistics: warehouses, industrial halls, and large-volume storage areas.
• Agricultural and food: greenhouses and processing areas requiring broad, uniform coverage.
• Commercial and services: parking structures, basements, ducts, and false ceilings with hard-to-reach infestations.

Advantages and considerations

Its main advantage is penetration: the microparticles reach zones other methods cannot cover and ensure a uniform distribution of product across large volumes relatively quickly. It is one of the preferred methods for controlling flying insects in large spaces.

As a consideration, it requires sealing the space during application and observing a ventilation period before re-entry, which means temporarily suspending activity in the area. Because it acts mainly on the air and exposed surfaces, it is usually complemented with residual spraying to reinforce control over crawling insects.

Safety and regulations

Thermal fogging is performed with COFEPRIS-registered products and in accordance with NOM-256-SSA1-2012. Trained personnel use personal protective equipment, signpost and cordon off the area, control dosing, and clearly define ventilation and safe re-entry times. Because of the density of the fog and the use of heat, the area must be cleared of people throughout the entire process. Fucesa operates with a current sanitary license.

Why Fucesa

With more than 40 years of experience, Fucesa applies thermal fogging within an Integrated Pest Management (IPM) framework: we assess the site, decide whether thermal fog is the right technique for the volume and the pest, and combine it with spraying or fumigation when appropriate. We design tailored programs —industrial, commercial, agricultural, or food— with trained personnel and documented follow-up. We serve from our Toluca headquarters and the Querétaro line.